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Histology > Muscle > Flashcards

Muscle Flashcards

1
Q

Myoblast origin

A

mesoderm

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2
Q

Endomysium make up

A

CT: reticular fibers and external lamina

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3
Q

Perimysium makeup

A

CT

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4
Q

Epimysium makeup

A

DCT

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5
Q

What is a muscle fascicle

A

Group of muscle fibers

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6
Q

Does skeletal muscle regenerate?

A

Yes-via satellite cells

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7
Q

Does cardiac muscle regenerate?

A

No

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8
Q

T tubules in cardiac muscle located?

A

At Z line

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9
Q

T tubules in skeletal muscle located at?

A

Junction of A-I bands

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10
Q

Dyad

A

Seen in cardiac muscle

One T tubule (at Z line) and one part of SR terminal end

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11
Q

Cardiac innervation

A

Involunatry

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12
Q

Cardiac muscle and mitochondria

A

Mito is very abundant in CM. Almost half of cell volume.

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13
Q

What’s at the ends of cardiac muscle?

A

Intercalated discs. Junction between cells ends=gap junctions that allows communication.

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14
Q

What muscles have and lack myofibrils

A

Have
Skeletal
Cardiac

Lack
Smooth muscle

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15
Q

Describe T tubules of the muscles

A

Skeletal
T tubules at junction of A-I bands

Cardiac
T tubules at Z lines

Smooth
Lack T tubules

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16
Q

What muscle is able to secrete ECM. What cell is this similar to in ECM production regards

A

Smooth

Similar to fibroblast

17
Q

Cab smooth muscle regenerate?

A

Yes all byyyyyy themmmmselves

Pericytes can help too though.

18
Q

What muscles have myofribrils and myofilaments

A

Cardiac and skeletal muscle have both

Smooth only has myofilaments (which are not highly organized). Lacks troponin

19
Q

Dense body in smooth muscle

A

Z line

20
Q

Unitary muscle smooth muscle

A

Few cells are innervated (works as syncytium via gap junctions). Muscle fibers form as band or bundles

21
Q

Multi-unit smooth muscle

A

Inidividually innervated. No gap junctions. Muscle fibers are individually located.

Histology (14 decks)

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