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SF1_Histology > Muscle Images > Flashcards

Muscle Images Flashcards

1
Q

Myofilaments are composed of:

A

actin and myosin

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2
Q

Myofibrils are composed of:

A

many myofilaments

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3
Q

Myofibers are composed of:

A

many myofibrils
myofibers = muscle cells

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4
Q

Fascicles are made up of:

A 
many myofibers (muscle cells)
muscle tissue consists of many fascicles
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5
Q

The three layers of connective tissue found in muscle and their locations:

A
  • Endomysium: surronds myofibers
  • Peromysium: surrounds fascicles
  • Epimysium: surrounds muscle (several fascicles)
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6
Q

Label this diagram of a myofibril:

A
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7
Q

Label this diagram of a myofilament:

A
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8
Q

What type of muscle is this?

A

skeletal muscle

  • Peripheral nuclei
  • Cylindrical, long, unbranched fibers
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9
Q

Label all and type of muscle:

A
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10
Q

Label all:

A
  • outlined by green = fascicle
  • green line = perimysium
  • outline by blue = myofiber
  • blue line = endomysium
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11
Q

Label all:

A

skeletal muscle

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12
Q

Label all and type of muscle:

A

skeletal muscle

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13
Q

Label all:

A
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14
Q

Label all:

A

between = myotendon junction

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15
Q

Label. What is this structure?

A

myotendon junction in skeletal muscle

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16
Q

Label. What is this structure?

A
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17
Q

Location of stem cells (satellite cells) in skeletal muscle:

A
  • underneath the basment membrane
  • stem cells have a central nucleus and very little cytoplasm
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18
Q

Label all:

A
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19
Q

What is a T-tubule?

A
  • plasma membrane that provides rapid transmission of the surface membrane excitation throughout the muscle cell.

LOCATED AT A-I JUNCTION

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20
Q

What are terminal cisterna?

A
  • SER expansions that release and store Ca++ via a voltage-sensitive Ca++ channel
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21
Q

A triad in muscle is:

A
  • T-tubule + 2 terminal cisterna
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22
Q

Label:

A

T-tubule (longitudinal section)

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23
Q

Label yellow arrow and black triangles:

A
  • yellow arrow = T-tubule
  • black triangles = triad
    • T-tubule + 2 terminal cisternae
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24
Q

Label:

A
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25
Q

Label the following on a cross-section of a sarcomere:

A
  • M = densely packed myosin only
  • H = myosin only
  • A = actin + myosin
  • I = actin only
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26
Q

What is this an image of?

A

nerve innervating muscle tissue

multiple myoneural junctions

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27
Q

Each nerve branch of a neuron innervates how many muscle fibers?

A
  • 1
28
Q

What is this an image of?

A

a single myoneural junction

29
Q

Label. What is this an EM of?

A

myoneural junction

30
Q

Label. What kind of muscle is this?

A

cardiac (longitudinal)

branching and centrally located nuclei

31
Q

Intercalated disc function and composition:

A
  • specific cell to cell boundaries
  • composed of:
    1. fasciae adherentes
    2. desmosomes (intermediate filaments)
    3. gap junction
32
Q

What type of muscle is this?

A

cardiac

(Muscle cell profiles exhibit a variety of shapes)

33
Q

Label. Type of muscle?

A

Cardiac

34
Q

T-tubule location in cardiac versus skeletal muscle:

A
  • skeletal: A-I junction
  • cardiac: Z-line
35
Q

What structure is the arrow pointing to?

A
  • intercalated disc in cardiac muscle
  • note: T-tubule at Z-line
36
Q

What is this an image of?

A
  • Cardiac myocyte with atrial natriuretic peptide vesicles.

LOWERS BLOOD PRESSURE

37
Q

What is the arrow pointing to?

A

intercalated disc in cardiac muscle

38
Q

Fascia Adherens:

A
  • actin filaments
  • transverse component of intercalated discs
39
Q

Spot Desmosome:

A
  • intermediate filaments
  • lateral component of intercalated discs
40
Q

Gap Junctions:

A
  • connexons
  • lateral component of intercalated discs
41
Q

What two structures in cardiac muscle are located at the Z-line?

A
  • intercalated discs
  • T-tubules
42
Q

Label. Type of muscle?

A
  • Purkinje fibers in cardiac muscle.
    • pale stain due to high glycogen content.
43
Q

What two parts of intercalated discs make up the lateral components of the intercalated disc?

A
  • gap junctions
  • spot desmosomes (macula adherens)
44
Q

Purkinje fiber function:

A
  • Conducts impulses to the ventricular myocytes
45
Q

Label.

A
  • Purkinje fibers = pale stain
  • Cardiac cells = dark stain
46
Q

What type of tissue is this?

A

Purkinje fibers

47
Q

What is circled?

A
  • myenteric plexus between to sheets of smooth muscle.
48
Q

What kind of muscle is this?

A

smooth muscle

  • sheets
  • very little CT between cells
  • Indistinguishable cell borders
49
Q

Label:

A
  • blood vessels are surrounded by smooth muscle
50
Q

What type of muscle is this?

What is located in the cytoplasm?

A
  • smooth muscle
    • one centrally located nuclei
    • cytoplasmic dense bodies
    • no Z-lines
51
Q

What are the arrows pointing to?

A
  • caveolae in between smooth muscle cells
    • involved in fluid and electrolyte transport
52
Q

What is the arrow pointing to?

A

gap junction in smooth muscle

53
Q

What type of muscle is this?

A

smooth

54
Q

What type of muscle is this?

A

skeletal

55
Q

What type of muscle is this?

A

cardiac

56
Q

What type of muscle is this?

A

longitudinal cardiac

57
Q

What type of muscle is this?

A

longitudinal smooth

58
Q

What type of muscle is this?

A

longitudinal skeletal

59
Q

What type of muscle is this?

A

skeletal

60
Q

What type of muscle is this?

A

cardiac

61
Q

What type of muscle is this?

A

smooth

62
Q

Cytoplasmic dense bodies composition:

A
  • only found in smooth muscle
  • thin myofilament attachment sites
  • α-actinin
63
Q

What is the only muscle cell that can divide?

A

smooth muscle

64
Q

What is the only muscle cell without T-tubules?

A

smooth muscle

65
Q

Characteristics of Skeletal Muscle (Myofiber, Myocyte):

A
  • Striated
  • Peripheral nuclei
  • Organized CT: epimysium, perimysium and endomysium
  • Triad located at the A-I junction
  • Triad = T-tubule and 2 terminal cisterns
66
Q

Characteristics of Cardiac Muscle:

A
  • Striated
  • Short, branched fibers
  • 1 or 2 centrally located nuclei
  • highly vascular CT
  • Not organized CT T-tubule at Z line Purkinje fibers Intercalated discs
67
Q

Characteristics of Smooth Muscle:

A
  • No striations
  • Spindle-shaped, tapering cell
  • Very little CT between cells
  • Indistinguishable cell borders
  • One centrally located nuclei
  • caveolae
  • No T-tubules and underdeveloped SR
  • Cytoplasmic dense bodies
  • Cells can divide

SF1_Histology (7 decks)

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