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Histology Lecture Test 2 > Bone Part 2 > Flashcards

Bone Part 2 Flashcards

1
Q

Size of the Haversian System

A

= size of osteoclast
(200um in diameter)

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2
Q

Bone Remodeling

A

produces osteons

-removal of existing bone by osteoclast
-redeposition of new bone by osteoblast

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3
Q

The outer margin of the osteon is

A

“cement line”

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4
Q

Is bone remodeling continuous?

A

yes (bone is an active organ)

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5
Q

What are the 3 phases of the bone remodeling cycle?

A
  1. resorption
  2. reversal
  3. formation
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6
Q

resorption

A

osteoclast digest old bone

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7
Q

reversal

A

mononuclear cells appear on bone surface

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8
Q

formation

A

osteoblast lay down new bone (until it is replaced completely)

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9
Q

Bone remodeling is both

A

systemic (Ca) and local

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10
Q

The major systemic regulator of bone remodeling are

A

-PTH
-Calcitonin
-Growth Hormones
-Glucocorticoids
-Sex Hormones

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11
Q

Wolf’s Law

A

apply a force to a bone will respond to that force
(braces)

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12
Q

Pattern of bone remodeling is determined by

A

local mechanical stresses (force)

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13
Q

Endochondral ossification

A

-replacement of cartilage precursor with bone
-most of the body

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14
Q

Where would you find Endochondral ossification

A

long bones, vertebrae, pelvis, and base of the skull

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15
Q

Intramembranous ossification

A

-direct replacement of mesenchyme bone

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16
Q

Primary Ossification Center

A

mid-diaphysis

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17
Q

Secondary Ossification Center

A

epiphyses

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18
Q

Process of Endochondral ossification

A
  1. primitive mesenchyme cells differentiate into chondroblast, lay down early perichondrium
  2. cartilage model made
    3.osteoprogenitor cells and osteoblast lay down bone, Bone Collar
    4.Starts to Calcify (chondrocytes die due to lack of blood)
  3. Blood vessel are brought in along with osteoprogenitor cells and osteoblasts
  4. Replace everything in diaphysis (1’)
  5. secondary ossification sites occur (after birth)
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19
Q

Bone Collar or Periosteal Cuff

A

first bone laid down and is under perichondrium on the shaft

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20
Q

Epiphseal Plate

A

-region of the metaphysis left open (unmineralized)
-allow conintous longitudinal growth

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21
Q

What is still visible on x-ray after a epiphyseal plate has closed?

A

epiphyseal line

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22
Q

In humans, what is the last long bone epiphyseal plate to close?

A

femur (age 18-20)

23
Q

What cause epiphyseal plate to close?

A

hormonal changes (decrease cartilage proliferation)

24
Q

Zones of the epiphyseal plate (starting at 2’ ossification center)

A

1.resting zone
2. proliferative zone
3.hypertrophic zone
4. calcification zone
5.ossification zone

25
Resting Zone/ Reserve Cartilage
-hyaline cartilage -no cell division
26
proliferative zone
-rows/columns of chondrocytes -adds length -cartilage cells undergo mitosis
27
hypertrophic zone
-big mature chondrocytes -large amounts of glycogen
28
Calcification Zone
-matrix becomes calcified -cartilage cells die
29
ossification zone
-area where blood vessels comes in along with osteoprogenitor cells, osteoblasts, and osteoclasts -new bone is forming
30
Process of Intramembranous Ossification
1. mesenchymal cells differentiate directly into osteoblast 2. Synthesize osteoid in multiple spots (multiple centers) 3. Mineralization occurs 4. 5.Osteoblasts get trapped and become osteocyte 5. Trabecular bone and periosteum form 6. Cortical bone forms 7. Red blood vessels form red marrow 8.
31
Spicule of Bone
irregular island of bone growth (Intramembranous Ossification)
32
Simple Bone Fracture
no break in the skin
33
3 most common bone fractures
simple compound comminuted
34
compound fracture
damage to skin exposing the bone
35
comminuted fracture
bone broken into many pieces (shatter)
36
Bone Repair Stages
1. Hematoma Formation 2. granulation tissue callus forms 3. bony callus forms 4. bone remodeling
37
Hematoma
forms when blood rushed into the fracture site
38
What do you find at the site of fracture in the acute phase
-neutrophils -macrophages
38
About a week after the fracture you see
-fibroblast -cappilaries proliferate and grow into new site
39
granulation tissue
-vascular collagenous tissue -get more and more fibrous (acute to chronic)
40
granulation tissue is replaced by
hyaline cartilage (provisional callous)
41
bony callus formation
1.osteoprogenitor cells and osteoblasts form endosperm and periosteum at edge of the wound and grow inward 2. mesh work of woven bone within the provisional callous 3. deposit calcium salt in collagen matrix 4. becomes bony callous (want to have bone "set" before this forms)
42
When the fracture site is completly bridged by woven bone this is known as
bony union
43
How long does the process of bone remodeling take after a fracture?
6-12 weeks (depending on size and location)
44
Synovial Joints are also know as
diarthroses
44
Synovial Joints
-extensive movement -joint capsule
45
Synovium
-membrane that lines joint cavity -secretes synovial fluid - no basement membrane -4 cell layers
46
What are the two types of cells in found in Synovium
type A type b
47
Type A - Synovicyte
-like macrophage -non-fixed (can move) -remove cell debris -present antigens
48
Type B- Synovicyte
-resemble fibroblast -make fluid -make lubricin - proper Synovicyte
49
Type A Synovicyte are derived form
blood-borne mononuclear cells
50
Type B Synovicyte produce
-hyaluronan -collagens -fibronectin -lubricin
51
Lubricin
-surface active mucinous glycoprotein -important role in cartilage integrity -prevents protein and cell adhesion

Histology Lecture Test 2 (12 decks)

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