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Exam 2
Bones, Skeleton, Joints
236
Anatomy
Undergraduate 3
02/10/2013

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Term
Skeleton is made of
Definition
cartilage and bone
Term
What type of tissue are cartilage and bone made of?
Definition
Connective Tissue
Term
Skeleton begins as__________, then it _________.
Definition
cartilage, ossifies
Term
Cartilage remains where _________ and __________ are needed.
Definition
stretch, compressibility
Term
Cells that form cartilage
Definition
Chondroblasts
Term
Describe the matrix of cartilage
Definition
firm
Term
Degree of vascularity in cartilage
Definition
Avascular
Term
Cartilage's ability to regenerate
Definition
weak
Term
What is the purpose of perichondrium
Definition
surround cartilage; it is dense irregular CT
Term
3 Subclasses of cartilage
Definition
Hyaline, elastic, fibrocartilage
Term
Hyaline cartilage
Definition
most abundant, large number of fine collagen fibers, firm support and some flexibility;
Term
Types of hyaline cartilage
Definition
articular, costal, nasal, respiratory
Term
Articular hyaline cartilage
Definition
at joints, reduces friction and absorbs compression at joints
Term
Costal hyaline cartilage
Definition
attaches ribs to sternum
Term
Nasal hyaline cartilage
Definition
external nose
Term
Respiratory hyaline cartilage
Definition
larynx, trachea, bronchi; keeps large airways open
Term
Axial skeleton
Definition
the part of the skeleton that includes the skull and spinal column and sternum and ribs
Term
Elastic cartilage
Definition
more elastic fibers, stretchier than hyaline, located where strength ad exceptional stretchability are needed: epiglottis and external ear
Term
Pinna
Definition
external ear
Term
Fibrocartilage
Definition
intermediate between hyaline and dense regular CT (proper); rows of chondrocytes alternate with thick parallel bundles of visible collagen fibers; stiff but compressible= shock absorber
Term
Fibrocartliage can be found in
Definition
intervertebral discs, knee meniscus, pubic symphysis
Term
4 types of bones classified by shape
Definition
long, short, flat, irregular
Term
Bone
Definition
well-vascularized, formed by osteoblasts, has excellent ability to regenerate, and it has a calcified matrix
Term
Long bone
Definition
longer than it is wide; all limb bones EXCEPT carpals, tarsals, and patellae
Term
Diaphysis
Definition
tubular shaft; surrounds medullar cavity filled with yellow bone marrow (fat)
Term
Epiphyses
Definition
bone ends; found at proximal and distal ends covered in articular cartilage to reduce friction and absorb compression at joints
Term
epiphyseal line
Definition
separates the diaphysis and epiphysis; remnant of the epiphyseal growth plate
Term
Growth plate
Definition
where bone is lengthening- seen in children
Term
Periosteum
Definition
CT membrane surrounding the bone except at the epiphyses where articular cartilage is already located; dense irregular CT; blood vessels and nerves pass through here; new bone tissue may be added or removed
Term
Endosteum
Definition
delicate CT membrane that lines the medullary cavity; where new bone tissue may be added or removed
Term
Osteogenic cells
Definition
divide to form new osteoblasts
Term
Osteoblasts
Definition
produce bone matrix ("bone-makers") and become mature osteocytes
Term
Osteocyte
Definition
mature bone cell that monitors and maintains the mineralized bone matrix
Term
Osteoclast
Definition
resorb bone ("bone-breakers")
Term
Short, flat, and irregular bones do not have
Definition
diaphysis, epiphyses, or medullary cavity
Term
Short bones
Definition
cubelike bones; includes tarsal, carpals, patellae (sesamoid); special type of short bone
Term
Flat bones
Definition
thin, flattened bones; include sternum, ribs, scapulae, roofing bones of skull
Term
Irregular bones
Definition
irregular shape; vertebrae, hip bones, certain facial and cranial bones
Term
Bone markings
Definition
projections for muscle attachment; depressions and openings for passage of blood vessels and nerves
Term
bones are classified by
Definition
type of osseous tissue
Term
2 types of osseous tissue
Definition
compact bone and spongy bone
Term
Compact bone
Definition
dense smooth appearance; basic structural unit: osteon (Haversian system)
Term
Osteons
Definition
tiny parallel pillars of bone
Term
Osteon has
Definition
lamellae= concentric cylinders of bone
Term
What do lamellae surround?
Definition
central (Haversian) canal; parallel to long axis of osteon; carries blood vessels and nerves
Term
lamellae are formed by
Definition
osteoblasts
Term
Lacunae
Definition
in mature bone, osteoblasts become osteocytes embedded; cavities within calcified matrix
Term
Canaliculi
Definition
tiny channels that interconnect the osteocytes and carry nutrients from cell to cell
Term
Perforating (Volkmann's) canal
Definition
at right angles to central canal; interconnect blood vessels from bone surface to interior
Term
Spongy bone
Definition
aka diploe; open spongy appearance, no osteons; structural units are trabeculae
Term
Trabeculae
Definition
thin beams of bone; have osteocytes embedded in lacunae; align along lines of stress; provide maximum support but keep bone lightweight
Term
arrangement of spongy bone
Definition
interior of epiphysis
Term
in flat cranial bones
Definition
diploe
Term
Rib
Definition
spongy bone center surrounded by compact bone; flat bone
Term
Vertebra
Definition
irregular bone; spongy bone surrounded by compact bone
Term
bone develops from
Definition
pre-existing tissue
Term
embryo bone
Definition
bony skeleton forms from cartilage
Term
infant through young adult bone
Definition
bones lengthen; grow to adult size
Term
mature adult bone
Definition
bone remodeling or repair
Term
ossification
Definition
process of bone formation
Term
2 types of ossification
Definition
intramembranous and endochondral
Term
intramembranous ossification
Definition
within membrane; from existing fibrous CT membrane; includes: "roofing" bones of skull and clavicles
Term
endochondral ossification
Definition
bone forms from model of hyaline cartilage; cartilage forms first, dies, then replaced with bone; occurs as embryo, includes all bones except roofing and clavicles; continues through puberty as long bones lengthen
Term
Bone growth in childhood
Definition
long bones lengthen via endochondral ossification; occurs at epiphyseal growth plate and articular cartilage (both hyaline)
Term
Why does the diaphysis widen?
Definition
to support more weight
Term
What cells beneath the peristeoum are here?
Definition
osteoblasts
Term
Why is cone resorbed from inside the medullary cavity?
Definition
keeps bones lightweight
Term
Bone homeostasis
Definition
continuous remodeling seen in adult skeleton; rate of bone resorption=rate of bone deposit; mass stays constant
Term
putting stress on bone will allow it to grow
Definition
stronger
Term
Bone remodeling
Definition
mechanical and gravitational factors affect bone remodeling; bone stress can change with weight/exercise; increase weight/exercise=thicken bone at point of greatest stress
Term
At which point of the diaphysis of a long bone would you expect to be the thickest?
Definition
Midpoint of the diaphysis
Term
Bone repair
Definition
bone has excellent regeneration; similar to wound repair; involves intramembranous and endochondral ossificatino
Term
How many bones are in the body?
Definition
206
Term
3 major regions of axial skeleton
Definition
skull, thoracic cage, vertebral column
Term
Cranial bones
Definition
8 bones; enclose the brain in the cranial cavity
Term
How many bones are in the skull?
Definition
22
Term
Facial bones
Definition
form facial features and cavities for organs
Term
All bones except the _________ interconnect via ________; non-movable joints
Definition
mandible; sutures
Term
Roofing bones
Definition
have layer of spongy bone known as diploe; surround and protect brain; are flat bones; are formed by intramembranous ossification
Term
Frontal bone
Definition
unpaired; anterior portion of cranium; forms forehead and roof of orbits
Term
Parietal bones
Definition
paired; "paries"= walls; form the superior and lateral walls of the skull
Term
Occipital bone
Definition
unpaired; forms most of posterior wall and base of the skull; articulates with 1st vertebra (atlas) at the occipital condyles
Term
Features of occipital bone
Definition
foramen magnum and occipital condyles
Term
Foramen magnum
Definition
big hole that allows spinal cord to go through
Term
Occipital condyles
Definition
rounded articular projections articulate with atlas to form the atlanto-occipital joint
Term
Temporal bones
Definition
paired; located inferior to the parietal bone
Term
Bone features of Temporal bone
Definition
external acoustic meatus, mastoid process
Term
external acoustic meatus
Definition
sound waves pass through here
Term
mastoid process
Definition
attaches to sternocleidomastoid muscle
Term
Sphenoid bone
Definition
unpaired cranial bone; complex bat shape; articulates with all other cranial bones
Term
Sella turcica
Definition
of sphenoid bone= "Turk's saddle"; bony depression in which the pituitary gland sits
Term
Ethmoid bone
Definition
unpaired cranial bone, inside; deepest cranial bone= nose
Term
Cheeks
Definition
zygomatic bones; paired; zygomatic process of temporal bone
Term
Nose
Definition
paired facial bones; form the bridge of nose; attach to frontal bone and maxillae; attach to nasal cartilage of external nose
Term
Nasal cavity roof
Definition
ethmoid bone; forms cavity and superior part of nasal septum; cribriform plates=punctured by tiny holes
Term
Nasal conchae
Definition
delicate, shell or scroll shaped; created turbulence in inspired air; air swirls; particles strike mucosa lining the nasal cavity and becoming trapped in mucus
Term
What epithelium forms the mucous membrane in the nasal cavity?
Definition
pseudostratified ciliated columnar epithelium mixed with goblet cells
Term
True or false: the occipital condyles articulate with the atlas to form the atlanto-occipital joint
Definition
True
Term
Lower jaw
Definition
formed by mandible; unpaired facial bone; largest strongest facial bone; only freely movable bone in skull
Term
2 bone features of mandible
Definition
mandibular condyles and sockets for lower teeth
Term
Upper jaw
Definition
formed by maxillae which fuse medially; have sockets for upper teeth; are the keystones of face; articulate with all other facial bones except mandible
Term
Hard palate
Definition
formed by maxillae and palatine bones; forms the posterior hard palate; both pairs of facial bones normally fuse medially
Term
Cleft palate
Definition
failure of maxillae and palantine bones to fuse medially; may also be upper lip
Term
Hyoid bone
Definition
not skull bone, does not articulate directly with any other bone, site of attachment for small muscles for swallowing and speech
Term
Vertebral column
Definition
axial support for trunk, surrounds and protects spinal cord, 26 irregular bones (vertebrae), separated by intervertebral discs
Term
Vertebral column encloses the vertebral cavity in which closed body cavity?
Definition
Dorsal body cavity; attachment point for ribs and numerous back/neck muscles
Term
Anulus fibrous of disc
Definition
outer ring of firbocartliage; compressible
Term
Nucleus pulposus of disc
Definition
semifluid center of collagen and elastic fibers; elastic/compressible
Term
How many cervical vertebrae are there?
Definition
7, in neck
Term
How many thoracic vertebrae?
Definition
12; thoracic cage and ribs attach here
Term
How many lumbar vertebrae?
Definition
5; lower back
Term
Sacrum
Definition
1 bone, from 5 fused vertebrae
Term
Coccyx
Definition
1 bone from 4 fused vertebrae=tailbone
Term
Thoracic and sacral curvatures
Definition
convex posterity; seen at birth; baby has C-shaped vertebral column
Term
Cervical and lumbar curvatures
Definition
concave posterity; secondary, develop after birth/reflect changes in shape of discs
Term
What is true about the cervical, thoracic , and lumbar regions of the vertebral column?
Definition
the overall size of the vertebrae tends to increase as you descend from cervical to lumbar; transverse foramina are a special feature of cervical vertebrae
Term
Overall size of the vertebrae increase going from cervical to thoracic to lumbar regions. Why?
Definition
Size increases as vertebrae bear more weight
Term
Regional characteristic of vertebrae
Definition
differences in size and shape of vertebral body, shape and length of spinous fluid, size and shape of vertebral foramen
Term
Cervical vertebrae
Definition
C1 to C7. lightest and smallest vertebrae, C1=atlas and C2=axis are atypical
Term
Typical cervical vertebra
Definition
small oval, vertebral foramen= large, triangular; bifid spinous process (except C7); transverse foramina carries blood vessels to brain
Term
Typical cervical vertebra
Definition
small oval, vertebral foramen= large, triangular; bifid spinous process (except C7); transverse foramina carries blood vessels to brain
Term
Atlas- C1
Definition
ring of bone, no body or spinous process, articulates with occipital condyles and forms atlanto-occipital joint; lets you nod head "yes"
Term
Axis- C2
Definition
has body and bifid spinous process, has dens (odontoid process)/ a tooth-shaped process projecting superiorly from body
Term
atlanto-axial joint
Definition
dens of axis articulate with atlas to form this joint, pivot point for rotation of atlas about the axis; lets you shake head "no"
Term
What shape is vertebral body of thoracic vertebrae?
Definition
heart-shaped
Term
What do each thoracic vertebrae articulate with?
Definition
a pair of ribs
Term
In thoracic vertebrae, the articular processes between adjacent vertebrae allow what?
Definition
rotation of the spine
Term
Lumbar vertebrae
Definition
largest, bear the most weight; kidney shaped, vertebral foramen= large and triangular
Term
Sacrum
Definition
articulates with the ilium of each hip bone to form sacroiliac joints; helps stabilize perlvis
Term
Thoracic cage
Definition
composed of thoracic vertebrae (T1-T12), sternum, and ribs and their costal cartilages
Term
Functions thoracic cage
Definition
protects heart and lungs, supports pectoral girdles and upper limbs, attaches to breathing muscles-diaphragm and intercostal muscles
Term
True or False: men and women have the same number of ribs
Definition
True; ribs attach posterioirly
Term
True ribs
Definition
vertebrosternal; pairs 1-7; attach directly to the sternum by individual costal cartilages
Term
False ribs
Definition
pairs 8-12; vertebronchondral ribs (8-10) and vertebral "floating" ribs"
Term
Vertebrochondral ribs
Definition
pairs 8-10; attach indirectly to sternum by joining costal cartilage of rib above
Term
Vertebral (floating) ribs
Definition
pairs 11-12, no attachments to sternum
Term
Pectoral girdle
Definition
shoulder, clavicle and scapula; attach upper limbs to axial skeleton, attach muscles that move the upper limbs, 2 girdles-articulate anteriorly but not posteriorly, allows free movement of shoulders
Term
Clavicle attaches medially to what?
Definition
Manubrium of sternum
Term
Pectoral girdle lateral end attaches to
Definition
acromion of scapula
Term
Clavicles
Definition
act as braces, hold scapulae and arms out laterally, break easily, designed to snap outward
Term
Scapula (shoulder blade)
Definition
flat, triangular; on dorsal surface of rib cage; has acromion and glenoid cavity
Term
Upper limb
Definition
arm (humerus), forearm (radius and ulna), and hand (carpals, metacarpals, and phalanges)
Term
Humerus
Definition
only bone of the arm (shoulder to elbow); classified as long bone; head at proximal end articulates with glenoid cavity; forms shoulder joint;distal end articulates with radius and ulna
Term
Shoulder joint
Definition
head of humerus fits into glenoid cavity; freely movable but easily dislocated
Term
What is another name for shoulder joint?
Definition
Glenohumeral joint
Term
Humerus articulates with ___________ of ulna to form _____________
Definition
olecranon process; elbow joint
Term
Ulna
Definition
medial forearm bone; contribute the most to form the elbow joint with humerus
Term
Radius
Definition
lateral forearm bone; same side as thumb,distal end articulate with certain carpals to form wrist (radiocarpal) joint
Term
Wrist
Definition
eight short bones (carpals); some articulate with radius
Term
Palm
Definition
five metacarpal bones (I, II, III, IV, V)
Term
Fingers
Definition
each finder (digit), except the thumb has 3 phalanges--proximal, middle, and distal; thumb has no middle phalanx
Term
What type of bones are metacarpals and phalanges?
Definition
long bones
Term
The knuckle joints are _________________, where the _____ end of a metacarpal articulates with the ____________end of the __________ proximal phalanx
Definition
metacarppphalangeal joints; distal; peoximal; proximal
Term
Pelvic (hip) girdle
Definition
two hip bones= coxal; attach lower limbs to axial skeleton with strong ligaments; transmit weight of upper body to lower limbs, support pelvic organs
Term
These bones articulate with each other
Definition
humerus and scapula; radius and ulna, ulna with humerus; humerus and radius
Term
Hip bones are what type of bone?
Definition
irregular
Term
All 3 bones in the pelvic girdle are _____ and form _________
Definition
hip bones, sacrum, and coccyx; acetabulum
Term
Acetabulum
Definition
"vinegar cup"; deep socket; articulates with head of femur to form hip joint
Term
Ishcial tuberosity
Definition
attaches to thigh muscles; supports your weight when you're sitting
Term
Obturator foramen
Definition
opening for blood vessels, nerves
Term
ilium
Definition
attaches to gluteal muscles
Term
Sella turcica
Definition
sphenoid bone
Term
glenoid cavity
Definition
scapula
Term
acromion
Definition
scapula
Term
madibrium
Definition
sternum
Term
obturator foramen
Definition
hip bone
Term
foramen magnum
Definition
occipital bone
Term
mandibular fossa
Definition
temporal bone
Term
superior nasal conchae
Definition
ethmoid bone
Term
mastoid process
Definition
temporal bone
Term
Lower limb
Definition
femur, tibia, fibula, tarsals, metatarsals, phalanges
Term
Femur
Definition
only bone in thigh; is largest strongest bone in body; head articulates with hip bone to for hip joint; distal articulates with tibia and patella to make knee joint; does NOT articulate with fibula
Term
condyles articulate with tibia to form _________
Definition
knee joint
Term
Tibia
Definition
larger leg bone, medial and on same side as big toe; bears body's weight- transmits it to foot
Term
Fibula
Definition
slender lateral bone, sticklike; helps stabilize the ankle
Term
Tibial tuberosity
Definition
large rough projection at anterior end of tibia attaches to patellar ligament
Term
Medial malleolus
Definition
inner bulge of ankle; articulates with talus
Term
How many bones are in the hand?
Definition
27
Term
The ankle has ___ tasrsals
Definition
7 (short bones)
Term
Calcaneous
Definition
heel bone
Term
Sole of foot has ___ metatarsals
Definition
5/ long bones
Term
Pubic symphysis
Definition
unites left and right illium
Term
sacroiliac joint
Definition
between ilium and sacrum
Term
True or false: All joints are movable
Definition
False
Term
Articulation
Definition
site where two or more bones meet "join"
Term
Synarthrosis
Definition
immovable joint
Term
Amphiarthrosis
Definition
slightly movable joint
Term
Diarhtrosis
Definition
freely movable joint
Term
Synovial joint
Definition
fluid-filled joint includes most joints in body
Term
Articular cavity
Definition
covers ends of bones absorbs compression
Term
Joint cavity
Definition
fluid-filled space between bones
Term
Articular capsule
Definition
encloses the joint cavity and has 2 parts: fibrous capsule and synovial membrane
Term
Fibrous capsule
Definition
outer layer of dense irregular CT; continuous with periosteum
Term
Synovial membrane
Definition
inner layer; lines fibrous capsule
Term
Synovial fluid
Definition
slippery fluid that lubricates the articular surfaces
Term
Reinforcing ligaments
Definition
dense regular CT connect bone to bone
Term
Gliding movements of synovial joints
Definition
bones glide past or over each other; examples: intercarpal joints, intertarsal joints, between articular processes of vertebrae
Term
Angular Movements
Definition
change angle between bones; flexion, extension, hyperextension, abduction, adduction, and circumduction
Term
Flexion
Definition
decrease angle at joint
Term
Extension
Definition
increase angle at joint
Term
Hyperextension
Definition
excessive extension beyond normal range of motion
Term
Flexion and extension of the neck occur at what joint?
Definition
atlanto-occipital joint
Term
Abduction
Definition
movement AWAY from the midline along frontal plane
Term
Adduction
Definition
opposite of abduction; movement TOWARD the midline
Term
Circumduction
Definition
flexion +abduction+extension+adduction; move a limb to describe a cone in space
Term
At which joint would circumduction of the head take place?
Definition
axial
Term
Rotation
Definition
turn bone around its own long axis; examples: C1 and C2; atlanto-axial, medial and lateral rotation of head as the atlas rotates about the dens of the axis; rotation of humerus or femur in their sockets
Term
Atlanto-occipital joint
Definition
the atlas articulates with the occipital condyles of the occipital bone
Term
Atlanto-axial joint
Definition
the atlas articulates with the dens of the axis
Term
Movements or radius around ulna
Definition
supination and pronation
Term
Supination
Definition
lateral rotation of forearm; palms face forward
Term
Pronation
Definition
medial rotation of forearm; radius crosses ulna like an "X"; palms face backward
Term
Movements of foot at ankle joint
Definition
Dorsiflexion and plantar flexion
Term
Dorsiflexion
Definition
upward movement; foot moves toward shin
Term
Plantar flexion
Definition
downward movement; foot moves away from shin
Term
movements of foot intertarsak joints
Definition
inversion and eversion
Term
inversion
Definition
turn sole medially
Term
eversion
Definition
turn sole laterally
Term
Movements in transverse plane
Definition
protraction and retraction
Term
Protraction
Definition
anterior movement, jut out the mandible and hunch shoulders forward
Term
Retraction
Definition
posterior movement, pull mandible back and square shoulders back
Term
Superior and inferior movements
Definition
elevation and depression
Term
Elevation
Definition
lift body part superiorly; raise mandible to close mouth and shrug shoulders up
Term
Depression
Definition
move body part inferiorly, lower mandible to open mouth; lower shoulders down
Term
Opposition of the thumb
Definition
movement so that thumb touches tips of other fingers
Term
six types, based on shape of articular surfaces
Definition
plane, hinge, pivot, condyloid, saddle, ball and socket
Term
What is true about arm flexion?
Definition
occurs at shoulder joint, is the forward movement of the arm (humerus) in the anterior/posterior plane
Term
Plane joints
Definition
gliding joints; angles do not change between bones; articular surfaces are flat and glide past each other
Term
Hinge joints
Definition
motion along a single plane; flexion and extension are only possible movements
Term
Pivot joints
Definition
rounded end of one bone fits onto a "sleeve", or ring of another bone; allows rotation about the long axis of a bone
Term
Pivoting atlanto-axial joint
Definition
atlas pivots around the dens of the axis; allows rotation of head
Term
Condyloid joints
Definition
both articular surfaces are oval; permit all angular movements: flexion, extension, abduction, adduction, and circumduction
Term
The condyloid joints include
Definition
knuckle joints (metacarpophalangeal and metatarsophalangeal), atlanto-occipital joint, wrist (radiocarpal) joint
Term
Saddle joints
Definition
allow same movements as condyloid joints plus opposition; each articular surface has both concave and convex areas (like saddle)
Term
Ball and socket joints
Definition
most freely movable synovial joints; rounded head of a bone fits into a depression; examples: hip and shoulder joints
Term
Which movements of the head are possible at the atlanto-axial joint?
Definition
medial and lateral rotation
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