Day 7- Bone Tissue

Question 1

osteoblasts are

Answer 1

immature, bone forming

Question 2

osteocytes are

Answer 2

mature bone cells

Question 3

osteoclasts are

Answer 3

break down bone (remodelling - remove matrix and release calcium)

Question 4

osteoprogenitor cells

Answer 4

stem cells that produce osteoblasts

Question 5

Matrix of bone is called

Answer 5

osteoid

Question 6

matrix is?

Answer 6

mineralized ground substance plus collagen and elastin

Question 7

Compact bone - structure and where?

Answer 7

densely packed matrix, highly organized vascular structure, forms walls of diaphysis in long bones and covers epiphyses

Question 8

Spongy bone - also called? and structure and where?

Answer 8

Trabecular

• very vascular
• red marrow found here
• insides of bones

Question 9

lacuna? what is in them

Answer 9

pockets for cells- hold osteocytes

Question 10

lamellae?

Answer 10

concentric rings of cells

Question 11

canaliculi?

Answer 11

little canals- interconnect lacunae allowing connections between cells

Question 12

Periosteum - what, layers, fibres are continuous with what?

Answer 12

surrounds bone
outer layer- fibrous
inner layer- cellular
fibres are continuous with bone, adjacent joint capsules, ligaments and tendons

Question 13

Ossification - endochondral

Answer 13

hyaline cartilage acts as a model for bone. within the matrix of cartilage, chondrocytes enlarge and calcify, blood vessels start growing in, fibroblasts turn into osteoblasts, and begin making spongy bone.

Question 14

Primary and secondary ossification centres are?

Answer 14

primary - in middle of to be diaphysis, secondary - in muddle os to be epiphyses

Question 15

epiphyseal growth plate is?

Answer 15

epiphyseal cartilage remaining between primary and secondary ossification centres.

Question 16

intramembrous ossification is?

Answer 16

bone develops from mesenchyme (fibrous) tissue. forms bones such as clavicle, mandible, flat bones of skull.