(ch.10) Skeletal muscle

Perimysium

("around the muscle") A layer of fibrous connective tissue that surrounds each fascicle (a group of muscle fibers).

Endomysium

('within the muscle") A fine sheath of connective tissue consisting mostly of reticular fibers that surrounds each muscle fiber within each fascicle.

Epimysium

(outside muscle) an overcoat of dense irregular connective tissue that surrounds the whole skeletal muscle.

Tendon

All three sheaths are continuous with the tendon, the connective tissue structure that joints skeletal muscles to bones.

nerves and blood vessels

In general, each skeletal muscle is supplied by one nerve, one artery, and one or more veins all of which enter or exit the muscle near the middle of its length.

More distal attachment

Insertion

What holds the muscle together?

Several sheaths of connective tissue hold the fibers of a skeletal muscle together.

What is the difference between a tendon and Ligament?

Tendon is muscle to bone.Ligament is bone to bone.

Insertion

The attachment of the muscle on the most moveable bone.

nerves and blood vessels

capillaries from a network within the endomysium. The rich blood supply to muscles reflects the high demand that contacting muscle fibers have for nutrients and oxygen.

Indirect attachment

example a tendon. The connective tissue extends well beyond the end of the muscle fibers to from either a cordlike tendon or a flat sheet called aponeurosis.

Direct attachment or (fleshy attachment)

example muscle look attached to the bone. The attaching strands of the connective tissue are so short that the muscles fascicles themselves appear to attach directly to the bone.

Muscle attachment

is the location on a bone where a muscle connects to the bone. Each skeletal muscle extends from one bone to another crossing at least one movable joint.

when a muscle contracts?

it causes one of the bones to move while the other bone usually remains fixed. When the muscles contracts its insertion is pulled toward its origin.

More proximal attachment

origin

The endomysium, perimusium and epimysium also?

provide a muscle with much of its elasticity and carry the blood vessels and nerves that serve the muscle fibers.

origin

the attachment of the muscle on the less moveable bone

Neuromuscular junction

the smallest nerve branches serve individual muscle fibers. interface between nerve and muscle fiber.

What happens when muscles contract?

they pull on the surrounding endomysium because of the continuity between sheaths, this pull is then exerted on he perimusium, epimysium and tendon.