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Chapters 9 and 10
Exam 2
77
Anatomy
Undergraduate 1
02/15/2011

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Term
basic functions of all muscles
Definition
excitablitiy, contractibility, extensibility, elasticity
Term
functions of skeletal muscle
Definition
produces movement of the skeleton, maintains posture and body position, supports soft tissue, guards orifices, maintains body temp
Term
orifices
Definition
openings into the body
Term
structural organization of skeletal muscle
Definition
whole muscle, muscle fascicle, muscle cell/muscle fiber
Term
CT layers involved with muscle
Definition
epimysium, perimysium, endomysium
Term
tendons
Definition
collagen bundles of epimysium, perimysium, and endomysium that converge to attach to bones, skin or other muscles
Term
aponeuroses
Definition
a tendon which is flattened
Term
tendons are interwoven into the ___ and ___
Definition
periosteum and matrix of bone
Term
skeletal muscle tissue
Definition
multinucleated, striated, voluntary, satellite cells help in repair
Term
membrane of skeletal muscle tissue
Definition
sarcolemma
Term
cytoplasm of skeletal muscle tissue
Definition
sarcoplasm
Term
transverse tubules
Definition
invaginations of sarcolemma which carry electical impulses
Term
myofibrils
Definition
in sarcoplasm surrounded by sarcoplasmic reticulum
Term
sarcoplasmic reticulum
Definition
internal membrane system
Term
sarcoplasm is made up of
Definition
myofilaments (protein)
Term
sarcomere
Definition
myofilaments in repeated unit arrangements
Term
actin
Definition
thin filaments
Term
myosin
Definition
thick filaments
Term
cisterna
Definition
swollen parts of reticulum near t-tubules
Term
one myofibril is as long as ___
Definition
the muscle fiber/cell
Term
myofibril
Definition
is attached to sarcolemma at each end of cell, it contracts to shorten fiber
Term
tropomyosin
Definition
covers active sites
Term
troponon
Definition
holds tropomyosin in place
Term
titn
Definition
strand that will connect thick filament to Z line
Term
A band
Definition
thick filaments
Term
M line
Definition
center of sarcomere
Term
I band
Definition
thin filaments
Term
Z line
Definition
end of sarcomere
Term
sarcomere
Definition
from Z line to Z line
Term
sliding filament theory
Definition
requires calcium and ATP, attach pivot detach return
Term
cross-bridge in sliding filament theory
Definition
head of myosin to active site of actin
Term
sliding filament theory explains __
Definition
how a muscle fiber exerts tension
Term
each skeletal muscle fiber is stimulated by a ___ at a ____
Definition
nerve fiber; neuromuscular junction
Term
synaptic terminal
Definition
synaptic vesicles release acetylcholine (ACh)
Term
muscle contraction
Definition
ACh released in synaptic terminal of nerve> ACh binds to motor end plate> electrical impulse in sarcolemma> impluse travels along t-tubules> sarcoplasmic reticulum releases Ca> cross bridge forms> contraction
Term
contraction is an __ process
Definition
active
Term
muscle tone
Definition
resting; some motor units are active causing muscles to be tense but no movement, maintains body position
Term
muscle hypertrophy
Definition
muscle repeated stimulated; increase in # of myofibrils; increase amount of mitochondria; tension increased
Term
muscle atrophy
Definition
muscle is not stimulated; muscle becomes smaller; muscle tone is decreased;
Term
what causes muscle atrophy?
Definition
disuse or lack of nerve input
Term
flaccid
Definition
muscle tone is decreased
Term
shapes of muscles
Definition
parallel, convergent, unipennate, bipennate, multipennate, circular
Term
deltoid
Definition
triangle
Term
obicularis
Definition
circle
Term
pectinate
Definition
comb like
Term
serratus
Definition
serrated
Term
splenius
Definition
bandage
Term
origin
Definition
point of attachment of muscle that is less movable
Term
insertion
Definition
point of attachment of muscle that is more movable
Term
axial musculature
Definition
arises from and inserts onto the axial skeleton
Term
axial musculature makes up __% of skeletal muscle
Definition
60
Term
axial musculature moves ___ assisting in ___
Definition
rib cage; breathing
Term
appendicular musculature
Definition
stabilizes components of the appendicular skeleton
Term
groups of muscles in the axial musculature
Definition
head and neck; vertebral column; abdominal wall; pelvic floor
Term
buccinator origin
Definition
alveolar processes of maxilla and mandible
Term
buccinator insertion
Definition
blends into fibers of orbicularis oris
Term
buccinatory action
Definition
compresses cheeks
Term
orbicularis oris origin
Definition
maxilla and mandible
Term
orbicularis oris insertion
Definition
lips
Term
orbicularis oris action
Definition
compresses, purses lips
Term
orbicularis oculi origin
Definition
medial margin of orbit
Term
orbicularis oculi insertion
Definition
skin around eyelids
Term
orbicularis oculi action
Definition
closes eye
Term
muscles of mastication
Definition
masseter, temporalis, pterygoid
Term
masseter muscle
Definition
closes mouth
Term
temporalis muscle
Definition
closes mouth
Term
medial pterygoid muscles
Definition
closes mouth
Term
lateral pterygoid muscles
Definition
opens mouth
Term
muscle of the tongue
Definition
genioglossus
Term
abducens
Definition
lateral rectus muscle
Term
trigeminal nerve
Definition
maesster, temporalis, medial pterygoid, lateral pterygoid muscles
Term
trochlear nerve
Definition
superior oblique muscle
Term
oculomotor nerve
Definition
superior rectus, medial recuts, inferior rectus, inferior oblique muscle
Term
facial nerve
Definition
orbicularis oculi, orbicularis oris, buccinator muscle
Term
vagus nerve
Definition
constrictor muscle
Term
accessory nerve
Definition
sternocleidomastoid muscle
Term
hypoglossal nerve
Definition
genioglossus muscle
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