Ch 6 Bone Microanatomy Flashcards

1
Q

Chondroblast function

A

Secrete the extracellular matrix of cartilage

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2
Q

Chondrocyte origin and function

A

They are chondroblasts which have surrounded themselves in cartilage matrix and function to maintain the cartilage matrix.

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3
Q

Hyaline cartilage: appearance, location, and function

A
Glassy appearance 
Between bones (joints) 
Serves at a model or precursor for bone growth
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4
Q

Fibrocartilage: Description, location, and function

A

Most durable
Very strong type of cartilage
Can be found in the spinal cord
Found in the Miniski in the knee

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5
Q

Elastic cartilage: Description

A

Most mobile type of cartilage

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6
Q

Describe Interstitial growth

A

growth from inside the tissue

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7
Q

Describe Appositional growth

A

Growth on outside of the tissue

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8
Q

Describe long bones

A

Longer than they are wide

Usually the bones of the limbs

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9
Q

Describe Short bones

A

Roughly equal in length and width

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10
Q

Describe Flat bones

A

Very broad but thin

Skull

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11
Q

Describe Irregular bones

A

Bones that don’t fit into any of the other categories

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12
Q

Describe Medullary cavity

A

yellow bone marrow, the middle of the bone

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13
Q

Describe Spongy bones

A

very pores, red bone marrow, where new bone marrow is produced

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14
Q

Describe Endosteum

A

internal covering (of medullary cavity)

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15
Q

Describe Periosteum

A

covers the superficial part of the bone except the articular regions

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16
Q

Describe Nutrient foramen

A

A hole in a bone where blood vessels and nerves travel through

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17
Q

Describe Osteoprogenitor cells

A

cells that haven’t become a bone cell yet but will become bone cells.

18
Q

Describe Osteoblasts

A

Cells that make bone tissue by secreting osteoid

19
Q

Describe Osteoid

A

Osteoblast secretion that forms into hardened bone tissue

20
Q

Describe Osteocytes

A

mature cells within the bone that sense stress/strain within the bone

21
Q

Describe Osteoclasts

A

Cells that dissolve or breakdown bone

22
Q

Describe Osteon

A

the individual cylinders that run through the whole length of the bone

23
Q

Describe Haversian system

A

the system of osteons

24
Q

Central canal

A

Center of osteon where the nerves run through

25
Q

Describe Concentric lamellae

A

layers or rings around the central canal

26
Q

Describe Canaliculi

A

tiny channels that allow osteocytes to communicate with one another

27
Q

Describe Perforating canals

A

perpendiculars canals that run at a 90 degree angle and connect the central canals.

28
Q

What bone type is formed by Intramembranous ossification

A

Flat bones

29
Q

What bone type is formed by Endochondral ossification

A

Long bones

30
Q

Describe a comminuted fracture

A

A bone breaks in at least two places

31
Q

Describe a compression fracture

A

When a bone is crushed

32
Q

Describe a spiral fracture

A

An excessive twist causing the bone to break

33
Q

Describe an epiphyseal fracture

A

When the epiphysis disconnects from metaphysis

34
Q

Describe a depression fracture

A

Bone portion pressed inwards

35
Q

Describe a greenstick facture

Buckle fracture

A

Most common fracture.
Bone bends and cracks but doesn’t fully break

36
Q

Describe a stress fracture

A

Small fractures due to overuse which can lead to a broken bone.

37
Q

Descire a simple fracture

A

A bone is broken but doesn’t protrude through the skin

38
Q

Describe a compound fracture

A

A bone is broken and pierces the skin

39
Q

What are the the steps in the bone repair process

A

1- a fracture hematoma forms in the area of the fracture
2- a fibrocartilaginous (soft) callus forms.
3- a hard (bony) callus forms.
4- the bone is remodeled (changing the structure of the bone)

40
Q

Describe osteopenia

A

Not producing enough new bone to keep up with the old bone breaking down

41
Q

Describe osteoporosis

A

A decrease in bone mass where bones ecome very porous