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Parts of Muscle Fibers
vocabulary
16
Anatomy
12th Grade
11/29/2012

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Term
endomysium
Definition
The fine connective tissue sheath surrounding a muscle fiber.
Term
fasicle
Definition
a small bundle or cluster, especially of nerve, tendon, or muscle fibers.
Term
perimysium
Definition
The fibrous sheath enveloping each of the primary bundles of skeletal muscle fibers.
Term
fascia
Definition
a sheet or band of fibrous tissue such as lies deep to the skin or invests muscles and various body organs
Term
sarcolemma
Definition
A thin membrane enclosing a striated muscle fiber.
Term
sarcoplasm
Definition
The cytoplasm of a striated muscle fiber.
Term
T tubule
Definition
The tubule that passes in a transverse manner from the sarcolemma across a myofibril of striated muscle.
Term
sarcoplasmic reticulum
Definition
a small network, especially a protoplasmic network in cells.
Term
myofibril
Definition
One of the threadlike longitudinal fibrils occurring in a skeletal or cardiac muscle fiber.
Term
myofilament
Definition
Any of the ultramicroscopic filaments, made up of actin and myosin, that are the structural units of a myofibril.
Term
sarcomere
Definition
One of the segments into which a fibril of striated muscle is divided.
Term
actin
Definition
One of the protein components found in muscle, existing as F-actin or G-actin, into which actomyosin can be split and which acts with myosin in muscle contraction.
Term
tropomyosin
Definition
Any of a group of muscle proteins that bind to molecules of actin and troponin to regulate the interaction of actin and myosin.
Term
troponin
Definition
A calcium-regulated protein in muscle tissue occurring in three subunits with tropomyosin
Term
myosin
Definition
The commonest protein in muscle cells, a globulin responsible for the elastic and contractile properties of muscle and combining with actin to form actomyosin.
Term
neuromuscular junction
Definition
the area of contact between the ends of a large myelinated nerve fiber and a fiber of skeletal muscle.
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