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The Musculoskeletal System > Histology > Flashcards

Flashcards in Histology Deck (25):
1

When referring to skeletal muscle cells, what does the term syncytial infer about the cell?

It is multinucleated

2

Why are nuclei found at the periphery of skeletal muscle cells?

The cytoskeleton pushes them to the cell peripheries

3

The bundles muscle fibres are grouped into are called what?

Fascicles

4

What is the term given to connective tissue around the muscle as a whole? 

Epimysium

5

What is the term given to connective tissue around the individual fascicles?

Perimysium

6

What is the term given to connective tissue around a single muscle fibre?

Endomysium

7

What is a motor unit?

A single motor neurone and all of the muscle fibres it innervates

8

By definition a sarcomere extends between which consectutive points? 

Between consecutive Z-lines

9

What are the types of skeletal muscle?

  1. Type I
  2. Type IIa
  3. Type IIb

10

What is type I muscle?

  • Slow fibres
  • Rely on oxidative metabolism
  • Abdundant mitochondria and myoglobin
  • Resistant to fatigue
  • Produce less force
  • Red in colour

11

What is type IIa muscle?

  • Relatively fast
  • Relatively resistant to fatigue
  • Relatively uncommon

12

What is type IIb muscle?

  • Fast
  • Depend on anaerobic metabolism
  • Few mitochondria and myoglobin
  • Fatigue easily
  • Produce more force
  • White in colour

13

How are chondrocytes nourished?

Diffusion from the extracellular matrix

14

What is the space within the extracellular matrix that chondrocytes reside?

Lacuna

15

What are chondrocytes responsible for secreting and maintaining?

The extracellular matirx around them

16

What is the extracellular matrix comprised of?

  • Water (75%)
  • Type II collagen
  • Proteoglycan aggregates

17

What are the three type of cartilage?

  1. Hyaline cartilage
  2. Fibrocartiliage
  3. Elastic cartilage

18

What is the most common form of cartilage?

Hyaline cartilage

19

By looking at a transverse section of a bone, two main bone types can be identified. What are these?

  1. Cortical bone (dense outer shell)
  2. Trabecular (cancellous) bone (fine inner meshwork)

20

What is the term given to cylindrical structures within bone composed of coincentric laminae?

Osteon

21

What are Volkmann's canals?

Small channels in the bone that transmit blood vessels from the periosteum into the bone. They transmit blood between osteons

22

What are Haversion canals?

Small blood vessels within osteons and bone. They are interconnected by Volkmann's canals

23

Which cells are responsible for bone resorption?

Osteoclasts

24

What are the bone forming cells?

Osteoblasts

25

What is the name given to a cell used to form bone that becomes trapped within the bone matrix?

Osteocytes

Decks in The Musculoskeletal System Class (58):