A&P Lab: Ex 19 Skeletal Muscle Structure & Function

each skeletal muscle is encased and permeated by

connective tissue sheaths

the connective tissue often projects beyond the end of the muscle, providing attached to

other muscles or to bones as a tendon

the connective tissues also extend into

the structure of a muscle and separates it into compartments

epimysium (connective)

outer layer

extends deeper into the muscle

perimysium (connective)

contains bundles of cells (fascicles)

endometrium (connective)

father inward

extends around each muscle cell (fiber), thin

connective tissue provides supports and reinforcement during muscular contractions and

allow portions of a muscle to contract somewhat independently

some collagen fibers are continuous with the tendon periosteum and inward extensions as bone fibers,

allowing a strong structural continuity

muscles named according to

location

size

action

shape

attachments

number of origins

direction of fibers

fascia

thin fibrous band of connective tissue

fasicle

small bundle of muscle fibers within a muscle

myosin

protein found within thick filament

sarcolemma

cell membrane of a muscle fiber

sarcomere

unit of alternating light and dark striations between Z lines

sarcoplasm

cytoplasm of a muscle fiber

sacroplasmic reticulum

cellular organelle in muscle fibers corresponding to the endoplasmic reticulum

tendon

cordlike part that attaches a muscle to bone

transverse t tubule

membranous channel extending inward from muscle fiber membrane

endomysium

layer of connective tissue that surrounds an individual muscle fiber

epimysium

layer of connective tissue that surrounds a skeletal muscle

perimysium

layer of connective tissue that separated a muscle into small bungles called fasicles