Msi Week 2: Histology Of Muscular Tissue

Front 1

The three connective tissue compartments of skeletal tissue are...

Back 1

Epimysium, perimysium, and endomysium

Front 2

Epimmysium surrounds?

Back 2

the entire skeletal muscle

Front 3

Perimysium compartmentalizes skeletal muscle forming...

Back 3

fascicles

Front 4

Endomysium divides fascicles into individual...

Back 4

fibers

Front 5

myofibrils are composed of repeating segments called

Back 5

sarcomeres; composed of actin and myosin

Front 6

Depolarization drives muscle contraction through a structure called?
And it is composed of what?

Back 6

Triad:
one T-tubule (and invagination of the sarcolemma (the muscle cell membrane)) and two terminal cisternai (the connection of the sarcolemma to the sarcoplasmic reticulum).

Front 7

sarcoplasmic cone

Back 7

region of mitochondria and glycogen commonly seen at the poles of the nucleus in cardiac muscle cells
"pale-staining area flanking the nucleus that is devoid of myofibrils"

Front 8

the three types of intercalated discs

Back 8

fascia adherens: anchoring site for the sarcomere nearest the end of the cell
Maculae adherens (desmosomes): Bind cells preventing seperation during contractions
Gap junctions: allow communications between cells

Front 9

Cardiac t-tubules system differ from skeletal t-tubules by...

Back 9

They are dyads (one terminal cisternae) compared to skeletals triad (with two). The t-tubules are larger and located at the Z-band (skeletal is the A-I junction)

Front 10

Dense bodies (plaques) in smooth muscle

Back 10

the equivalent of z bands. multiple crossing bands within the cell membrane that the actin filament connect to

Front 11

unlike the other two types of muscles smooth muscle is capable of...

Back 11

undergoing mitosis. (hyperplasia)

Front 12

iron hematoxylin stain

Back 12

enhance the striations of skeletal muscle

Front 13

iron hematoxylin stain

Back 13

enhance the striations of skeletal muscle

Front 14

Cardiac Muscle cells have what characteristic pattern?

Back 14

whorled pattern, in order to "wring out the blood"

Front 15

In a slide of cardiac muscle the fascicles can be seen in what orientation?

Back 15

transverse, oblique And longitudinal

Front 16

in a longitudinal section of muscle fibers how can you tell the difference between cardiac and skeletal muscle?

Back 16

A regular branching and anastamosing pattern is the most distinctive characteristic of cardiac muscle

Front 17

the frequent location for the nuclei of a cardiac cell is...

Back 17

mid-fiber position

Front 18

Purkinje fibers

Back 18

modified cardiac muscle cells specialized for impulse conduction.
They are larger and have lower density of myofibrils so it is easier to observe the intercalated disks and myofibrils.