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Cronk Appendicular Skeleton
Chapter 8
31
Biology
Undergraduate 1
05/06/2012

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Term
APPENDICULAR SKELETON
Definition
126 bones • It includes bones of the upper and lower limbs • Girdles attach the limbs to the axial skeleton
Term
UPPER LIMB
Definition
• Each upper limb has 32 bones • Two separate regions
1. The pectoral (shoulder) girdle (2 bones) 2. The free part (30 bones)
Term
PECTORAL GIRDLE – CLAVICLE
Definition
• The medial end articulates with the sternum forming the sternoclavicular joint • The lateral end articulates with the acromion forming the acromioclavicular joint • The clavicle is convex in shape anteriorly near the sternal junction • The clavicle is concave anteriorly on its lateral edge near the acromion
Term
PECTORAL GIRDLE – SCAPULA
Definition
• Also called the shoulder blade, Triangular in shape • Special features include the spine, acromion, coracoid process and the glenoid cavity, 3
borders, 2 angles & 3 fossa
Term
Spine
Definition
a large process on the posterior of the scapula that ends laterally as the acromion
Term
Glenoid cavity
Definition
articulates with the head of the humerus: glenohumeral joint
Term
HUMERUS
Definition
• Longest and largest bone of the free part of the upper limb • The proximal ball-shaped end articulates with the glenoid cavity of the scapula • The distal end articulates at the elbow with the radius and ulna • Special features: greater & lesser tubercles, deltoid tuberosity, medial & lateral epicondyles.
Coronoid, olecranon & radial fossae
Term
Capitulum
Definition
a round knob-like process on the lateral distal humerus
Term
Trochlea
Definition
medial to the capitulum, is a spool-shaped projection on the distal humerus
Term
humeroulnar joint
Definition
Humerus articulates with the ulna
Term
humeroradial joint
Definition
Humerus articulates with the radius
Term
BONES OF THE FOREARM – ULNA
Definition
• The longer of the two forearm bones • Located medial to the radius • Special features: olecranon & coronoid processes, trochlear notch, radial notch, styloid
process
Term
BONES OF THE FOREARM – RADIUS
Definition
• Lies lateral to the ulna (thumb side of the forearm) • The head articulates with the capitulum of the humerus and the radial notch of the ulna:
proximal radioulnar joint
• The head of the ulna articulates with the ulnar notch on the radius, distal radioulnar joint • The shafts of both the radius & ulna are held together by the interosseus membrane joint • Distal end of the radius forms a joint with the scaphoid, lunate & triquetum as the
radiocarpal joints
• Other features: radial tuberosity, styloid process, scaphoid facet, lunate facet
Term
BONES OF THE HAND
Definition
• The carpus (wrist) consists of 8 small bones (carpals) • Two rows of carpal bones • Proximal row - scaphoid, lunate, triquetrum, pisiform • Distal row - trapezium, trapezoid, capitate, hamate • Intercarpal joints: joints between the individual carpal bones
Term
METACARPALS & PHALANGES
Definition
• Five metacarpals - numbered I-V, lateral to medial • 14 phalanges - two in the thumb (pollex) and three in each of the other fingers • Each phalanx has a base, shaft, and head • Joints – carpometacarpal (proximal metacarpals & carpals) &, metacarpophalangeal
(between heads of metacarpals & phalanges) , interphalangeal joints, (between the proximal & middle and middle and distal phalanges)
Term
SKELETON OF THE LOWER LIMBS
Definition
• Two separate regions
1. A single pelvic girdle (2 bones) 2. The free part (30 bones)
Term
PELVIC GIRDLE
Definition
hip bones, coxal bones, os coxa(e) • Each coxal (hip) bone consists of three bones that fuse together: ilium, pubis, and ischium • Connects the bones of the lower limbs to the axial skeleton • The two coxal bones are joined anteriorly by the pubic symphysis joint • Joined posteriorly by the sacrum forming the sacroiliac joints
Term
BONY PELVIS
Definition
ring of hip bones: includes coxal bones and sacrum
Term
THE ILIUM, ISCHIUM AND PUBIS
Definition
• Ilium is the superior part of the hip bone • Ischium - inferior and posterior part of the hip bone • Pubis - inferior and anterior part of the hip bone • Special features: arcuate line, acetabulum, obturator foramen, ischial spine, greater & lesser
sciatic notch, ischial tuberosity, iliac crest, anterior superior & inferior iliac spines, Posterior superior & inferior iliac spines, superior & inferior rami (ramus singular) of pubis
Term
Ischium
Definition
inferior and posterior part of the hip bone
Term
Pubis
Definition
inferior and anterior part of the hip bone
Term
Pelvic brim
Definition
a line from the sacral promontory to the upper part of the pubic symphysis
Term
False pelvis
Definition
lies above this line (Fig 8.9b)
Term
True pelvis
Definition
the bony pelvis inferior to the pelvic brim, has an inlet, an outlet and a cavity
Term
MALE & FEMALE PELVIS
Definition
• Males - bone are larger and heavier • Pelvic inlet is smaller and heart shaped • Pubic arch is less the 90° • Female - wider and shallower • Pubic arch is greater than 90°
Term
SKELETON OF THE THIGH –FEMUR & PATELLA
Definition
• Femur - longest, heaviest, and strongest bone in the body • Proximally, the head articulates with the acetabulum of the hip bone forming the hip joint:
iliofemoral joint • The condyles of the femus articulate with the condyles of the tibia forming tibiofemoral
joint
• Special features: head, with fovea capitis, neck, greater & lesser trochanters, intertrochanteric crest, linea aspera, medial and lateral condyles, intercondylar fossa, medial & lateral epicondyles
Term
PATELLA
Definition
• Largest sesamoid bone in the body • articulates with the patellar surface of femur Patellofemoral Joint • base, apex, articular facet
Term
TIBIA
Definition
• The larger, medial weight-bearing bone of the leg • Special features: medial & lateral condyles, intercondylar eminence, tibial tuberosity,
medial maleolus • Forms joints with the fibula: proximal & distal tibiofibular joint
Term
FIBULA
Definition
• The smaller, laterally placed bone of the leg • Special features: head, lateral maleolus
Term
SKELETON OF THE FOOT – TARSALS, METATARSALS & PHALANGES
Definition
• The talus forms joints with the fibula and tibia: talocrural joint • Seven tarsal bones - talus, calcaneus, navicular, cuboid and three cuneiforms, form the
intertarsal joints
• Five metatarsals - (I-V) base, shaft, head • 14 phalanges – (I–V), proximal, middle & distal, form the: interphalangeal joints
Term
ARCHES OF THE FOOT
Definition
Two arches support the weight of the body
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