Topic 32 - Muscular Tissue : Skeletal Muscle Flashcards Preview

Histology 101 > Topic 32 - Muscular Tissue : Skeletal Muscle > Flashcards

Flashcards in Topic 32 - Muscular Tissue : Skeletal Muscle Deck (7)
Loading flashcards...
1
Q

Length of the skeletal myofibres?

A

10-120mm

2
Q

origin…?

A

by fusion of mononuclear myoblast cells

3
Q

Function?

A

-Non-branching multinucleated fibres. Quick contraction with high fatigue. Impulses generated by motor endplate. Found in locomotor organs (muscles).

4
Q

Morphology?

A
  • Longitudinal: elongated nuclei (subsarcolemmal), traverse striations.
  • Cross-section: polygonal cells, no cross-striations
5
Q

Organization?

A
  • Myofibrils are surrounded by endomysium (fine reticular CT).
  • Primary bundles/fascicles are covered by perimysium (dense collage fibres).
  • Muscle is ensheathed by epimysium (thick and dense collagen CT).
6
Q

How is the muscle fibres innervated?

A

-by stretch receptors (with sensory capsule) and gamma motor neurons (motor neuron endplates attached to each muscle fibre).

7
Q

What is neuromuscular junction?

A

myelinated nerve fibre and axon terminal. Motor neuron endplate contains acetyl-choline vesicles. Acetyl-choline receptors are contained in the sarcolemma of the muscle fibre.

Decks in Histology 101 Class (46):