Muscular System

Muscular System
Muscles are responsible for all types of body movement

Three basic muscle types are found in the body

Skeletal muscle

Cardiac muscle

Smooth muscle




skeletal muscle
Most skeletal muscle fibers are attached by tendons to bones

Skeletal muscle cells are large, cigar-shaped, and multinucleate

Also known as striated muscle because of its obvious stripes

Also known as voluntary muscle because it is the only muscle tissue subject to conscious
control

Skeletal muscle cells are surrounded and bundled by connective tissue




Muscular System 1

, Endomysium — encloses a single
muscle fiber

Perimysium — wraps around a fascicle
(bundle) of muscle fibers

Epimysium — covers the entire skeletal
muscle

Fascia — on the outside of the
epimysium




The epimysium of skeletal muscle
blends into a connective tissue
attachment

Tendons

cordlike structures

Mostly collagen fibers

Often cross a joint because of
their toughness and small size

Aponeuroses

sheetlike structures




Muscular System 2

, Attach muscles indirectly to
bones, cartilages, or connective
tissue coverings




functions of the skeletal muscle
Whereas all muscle types produce movement, skeletal muscle has three other important
roles:

Maintain posture and body position

Stabilize joints

Generate heat




microscopic anatomy of the skeletal muscle
Sarcolemma

specialized plasma membrane

Myofibrils

long organelles inside muscle cell




Muscular System 3