describe in detail the anatomy of skeletal muscles

Expert Solution

ANATOMY OF SKELETAL MUSCLES
Skeletal muscle are the striated muscle or voluntary muscles. Which acts according to the voluntary action of individuals.
Skeletal muscle structure:
Composed of muscle cells(fibers) , connective Tissue and blood vessels. These fibers are long and multi nucleated. These nuclei are Peripherally situated. It has a striated appearance . It develops from myoblasts.
Muscle fibers anatomy
1. SARCOLEMMA: is the cell membrane. Surrounds the sarcoplasm( cytoplasm of the fiber)
2. MYOFIBRILS: are bundles of protein filament. It is a cylindrical structure in muscle fiber. It has two types filaments
A) actin ( thin)
B) myosin( thick)
All the myofibrils are arranged parallel to the long axis of cells

Features of skeletal muscle:
Presence of striations due to the presence of alternative dark and light bands
A dark band ( A band) contains thin and thick filaments, and it is anisometropic to polarized light.
H zone
A light band only contains light thin filaments. , and it is isotropic to polarized light. Each band is bisected by z line.
SARCOMERE
The portion of myofibrils between two successive z lines.

PARTS OF SKELETAL MUSCLE
1.FLESHY PART
2. FIBROUS PART
a. Tendinous
b. Aponeurotic
CLASSIFICATION ( according to color)
Red muscle
White muscle
2. ACCORDING TO DIRECTION of muscle fibers
Quadri lateral
Strap
Strap with tendinous intersection
Fusiform
Digastric
Cruciate
Spiral.
MUSCLE ACTION
1 PRIME MOVER
2.ANTAGONIST
3.fixator
4.synergist.

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