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Human Anatomy
Muscle PPT. Lecture 3
42
Anatomy
1st Grade
08/02/2011

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Term
3 types of loss of muscle function
Definition
myasthenia gravis
cardiomyopathies
TMD
Term
Cells specialized in motile forces
(contraction)
Definition
1. myoepitheal cells (glands)
2. Pericytes (pre-capillary)
3. Myofibroblasts (wound contraction)
4. Muscle cells (muscles)
Term
Muscle cell abilities
Definition
1. stretch beyond resting length (not contraction state)
2. return to resting state after contraction (elasticity)
3. Increase in size (hypertrophy) or number Hyperplasia or both
Term
Hypertrophy
Definition
muscle increase in size, weight lifting
Term
Hyperplasia
Definition
muscle cells increase in number . only occurs in the smooth muscle, a little in skeletal muscle in stem cells.
Term
muscle structure
Definition
tendon, epimysium
Term
epimysium
Definition
connective tissue that outlies major muscles.
Term
fascicle
Definition
bundles of muscle fibers surrounded by perimysium
Term
perimysium
Definition
surrounds fascicle.
Term
muscle cell
Definition
can be very long up to 20cm.
Term
endomysium
Definition
surounds muscle fibers
Term
muscle fiber
Definition
multinucleated. within is myofibrils
surrounded by endomysium
Term
Myofibril
Definition
made up of individual elements that generate contraction. broken down into sarcomeres. 20 cm
Term
sarcomeres
Definition
z-line to z-line
Term
Thin fibers
Definition
actin
Term
thick fibers
Definition
myosin
Term
myofilament
Definition
is the thick and thin filamens in a sarcomere.
Term
Muscle action
Definition
related to contraction...not relaxation.
Term
Coordination of Skeletal Muscle Activity
Definition
1. Innervation (neuromuscular Junction)
2. Internal spread of depolarization
3. regulation of posture and mvment
Term
neuromuscular junction
Definition
formed by reln b/n the axon and the muscle fiber calle d a motor end plate.
Term
motor unit
Definition
defined as the number of muscle fibers innervated by a single neuron.
Term
motor neuron
Definition
may innervate from 1-3 muscle fibers (extraoccular muscles) or as many as several hundred fo rlarge limb muscles.
Term
Internal spread of depolarization
Definition
releases acH causes depolarization which travelsto the transverse tubule system. this leads to release of calcium from the sarcoplasmic retiuclum in a fraction of a second.
Term
Sarcoplasmic reticulum
Definition
storehouse for Ca. releases after depolarization
Term
reflex arc
Definition
1. sensory neurons (afferent arm of reflex)
2. Alpha motor neuorn (efferent arm of reflex)
3. Gamma motor neuron (sesitivity of spindle)
Term
sensory neuorns
Definition
Term
alpha motor neurons
Definition
Term
gamma motor neurons
Definition
Term
internal contractile forces
Definition
transformed into movement by transmission of contraction across the cell membrane to teh external lamina.
Term
Desmin
Definition
Term
Transmembrane Protein
Definition
Term
Endomysium
Definition
Term
Perimysium
Definition
Term
Epimysium
Definition
Term
Cardiac Muscle
Definition
-striated
-multiple perpipheral nucleus
-branches
-intercalculated discs
Term
Intercalated discs
Definition
cardiac muscle.
provide electrical adn mechanical coupling.
Term
Conducting system of the heart
Definition
1. SA adn AV nodes receive parasympathetic adn sympathetic input.
2. Conducted thr the L/R bundle of His
3. Continues via teh purkinge fibers to teh cardiac muscle cells.
Term
purkinje fibers
Definition
in cardiac conduction not contraction
Term
Gap junctions
Definition
form hollo organs, passages, or cavities, and serve to modify their volume. connect smooth muscle cells.
Term
Gap junctions
Definition
form hollo organs, passages, or cavities, and serve to modify their volume. connect smooth muscle cells.
Term
smooth muscle
Definition
innervated by both sympathetic, adn parasympathetic
Term
actin binding dense bodies
Definition
in cytoplasm on the sarcolemma, euquvalent to Z- Lines in stirated muscle.
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