SUMMARY OF THE MAJOR FEATURES OF THE THREE TYPES OF MUSCULAR TISSUE Flashcards
These are microscopic structures that
are irregular transverse thickenings of the sarcolemma that connect the ends of cardiac
muscle fibers to one another.
intercalated discs
The principal tissue in the heart wall
Cardiac muscle tissue
Cardiac muscle tissue has an endomysium and perimysium, but lacks in
epimysium.
CHARACTERISTIC OF
SKELETAL MUSCLE IN “MICROSCOPIC APPEARANCE AND FEATURES”
Long cylindrical fiber with many peripherally located in nuclei, unbranched, striated
CHARACTERISTIC OF
CARDIAC MUSCLE IN “MICROSCOPIC APPEARANCE AND FEATURES”
Branched cylindrical fiber with one centrally located nucleus neighboring fibers; striated
CHARACTERISTIC OF
SMOOTH MUSCLE IN “MICROSCOPIC APPEARANCE AND FEATURES”
Fiber thickest in middle with one centrally positioned nucleus; not striated
LOCATION OF SKELETAL MUSCLE
Most commonly attached by tendons to bones
LOCATION OF CARDIAC MUSCLE
Heart
LOCATION OF SMOOTH MUSCLE
Walls of hollow viscera, airways, blood vessels, iris and ciliary body of eye
FIBER DIAMETER OF SKELETAL MUSCLE
Very large (10-100 micrometers)
FIBER DIAMETER OF CARDIAC MUSCLE
Large (10-20 micrometers)
FIBER DIAMETER OF SMOOTH MUSCLE
Small (30-200 micrometers)
CONNECTIVE TISSUE COMPONENTS OF SM
Endomysium, perimysium, and epimysium
CONNECTIVE TISSUE COMPONENTS OF CM
Endomysium, perimysium
CONNECTIVE TISSUE COMPONENTS OF SMOOTH MUSCLES
Endomysium
FIBER LENGTH OF SM
Very large (100 μm-30cm-12 in.)
FIBER LENGTH OF CM
Large (50-100 μm).
FIBER LENGTH OF SMOOTH MUS.
Intermediate (30-200 μm).
CONTRACTILE PROTEINS ORGANIZED INTO SARCOMERES (SM)
YES
CONTRACTILE PROTEINS ORGANIZED INTO SARCOMERES (CM)
YES
CONTRACTILE PROTEINS ORGANIZED INTO SARCOMERES (Smooth mus.)
NO
SARCOPLASMIC RETICULUM OF SM
Abundant
SARCOPLASMIC RETICULUM OF CM
Some
SARCOPLASMIC RETICULUM OF SMOOTH MUS.
Very little
