Topic 10: Skeletal System - Long Bone Components

Question 1

Name the 8 components of long bone

Answer 1

1) diaphysis
2) epiphyses
3) epiphyseal plate
4) epiphyseal line
5) medulla cavity
6) periosteum
7) Endosteum
8) Articular cartilage

Question 2

What is the diaphysis?

Answer 2

• shaft

Question 3

What is the epiphyses?

Answer 3

• proximal + distal extremities (end of diaphysis)

Question 4

What is the epiphyseal plate? (2)

Answer 4

• hyaline cartilage
• used for bone growth (length)
  in lecture, separates epiphyses from diaphysis

Question 5

What is the epiphyseal line?

Answer 5

• replaces plate with bone when growth completed

Question 6

What is the medullary cavity? (2)

Answer 6

• red marrow in child (makes RBC and WBC)
• yellow marrow in adult (fat storage)
  in lecture, center of long bone

Question 7

What is the periosteum?

Answer 7

• external surface (membrane)
• 2 layers of CT

Question 8

What is the outer layer of the periosteum made of? function?

Answer 8

• dense irregular
• tendon/muscle/ligament attachment

Question 9

What is the inner layer of the periosteum made up of? (2)

Answer 9

• mainly osteoblasts and osteoclasts
• allows bone to grow in diameter

Question 10

What is the endosteum? (2)

Answer 10

• lines medullary cavity AND canals
• contains osteoblasts and osteoclasts
  in lecture he said it is inner lining

Question 11

What is articular cartilage? (2)

Answer 11

• hyaline, only at articulation points
• reduces friction between bones (no periosteum here)