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Histology of Skeletal Muscle
Histology of Skeletal Muscle
14
Anatomy
Undergraduate 1
03/30/2009

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Term
Sarcolemma
Definition
Plasma membrane of muscle cells
Term
Sarcoplasm
Definition
Cytoplasm of muscle cells, filled with myofibrils
Term
Sarcoplasmic reticulum
Definition
Endoplasmic reticulum of muscle cells
Term
Myosin
Definition
Protein of thick myofilaments
Term
Actin
Definition
Makes up the thin myofilaments with troponin and tropomyosin
Term
Myofibril
Definition
A bundle of thick and thin myofilaments
Term
Sarcomere
Definition
The section of myofibril between two Z-lines
Term
Muscle fibre
Definition
A multi-nucleate cell containing many myofibrils
Term
Fasciculus
Definition
Unit of muscle consisting of many muscle fibers
Term
Neuromuscular Junctions
Definition
The meeting point of a motor end plate on the sarcolemma and the axon terminal of a motor nerve cell
Term
Z-line
Definition
Dividing line between sarcomeres, attaches to the I-band
Term
I-band
Definition
Section of a sarcomere containing only thin myofilaments
Term
A-band
Definition
Section of a sarcomere containing thick and thin myofilaments
Term
H-zone
Definition
Section of a sarcomere containing only thick myofilaments when the muscle is relaxed
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