Connective Tissue Part III Flashcards

(48 cards)

1
Q

dense layer forms the outside of the bone

A

compact bone

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2
Q

spongelike meshwork consisting of trabeculae

A

spongy bone (cancellous bone)

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3
Q

The spaces within the meshwork are continuous and occupied by marrow and blood vessels.

A

spongy bone (cancellous bone)

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4
Q

longer in one dimension
e.g., humerus, femur

A

Long bones

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5
Q

nearly equal in length and diameter

A

Short bones

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6
Q

Have compact, spongy bone and a marrow space on the inside

A

Short bones

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7
Q

Articular surfaces are covered with hyaline cartilage

A

Short bones

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8
Q

Examples are carpals, tarsals, patella

A

Short bones

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9
Q

thin and platelike bones

A

Flat bones

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10
Q

Examples are parietal bone, scapula, sternum

A

Flat bones

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11
Q

Thick compact bone with an intervening layer of spongy bone

A

Flat bones

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12
Q

Examples are vertebrae, hip bones, ethmoid bone

A

Irregular bones

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13
Q

tendons

A

Sesamoid bones

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14
Q

Is an outer fibrous sheath of dense regular connective tissue covering of the bone except articular surface.

A

Periosteum

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15
Q

Two layers of Periosteum

A

outer fibrous layer
an inner cellular (osteogenic) layer

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16
Q

is well defined If active bone formation is in progress

A

inner cellular (osteogenic) layer of Periosteum

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17
Q

The relatively few ______ are capable of undergoing division and becoming osteoblasts under appropriate stimulus.

A

periosteal cells

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18
Q

Collagen fibers from ligaments and tendons extend directly into the bone tissue, where they are continuous with the collagen fibers of the extracellular matrix of the bone tissue.

A

Sharpey’s fibers

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19
Q

The marrow cavity and the spaces in spongy bone contain ____

A

bone marrow

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20
Q

normally restricted to the spaces of spongy bone in the adult

A

Red bone marrow

21
Q

consists mostly of fat cells

A

yellow marrow

22
Q

can revert to red marrow e.g. extreme blood loss

A

yellow marrow

23
Q

Mature Bone/Lamellar bone is composed of cylindrical units called

A

Osteons or Haversian systems

24
Q

osteons consist of concentric lamellae of bone matrix surrounding a central canal, the osteonal (Haversian) canal, which contains the vascular and nerve supply of the osteon.

A

Mature Bone/lamellar bone

25
Within the bone matrix are spaces called ______, each containing osteocyte.
lacunae
26
The osteocyte extends numerous processes into small tunnels called ________.
canaliculi
27
communicate by gap junctions with other osteocytes
canaliculi
28
generally arranged in a radial pattern with respect to the Haversian canal
canaliculi
29
serves for the passage of substances between the osteocytes and blood vessels
canaliculi
30
Between the osteons are remnants of previous concentric lamellae called
interstitial lamellae
31
_______ follow the entire inner and outer circumferences of the shaft of a long bone
Circumferential lamellae
32
This is where blood vessels and nerves travel from the periosteal and endosteal surfaces to reach the osteonal canal; they also connect osteonal canals to one another
Perforating canals (Volkmann’s canals)
33
not surrounded by concentric lamellae
Perforating canals (Volkmann’s canals)
34
CELLS OF BONE TISSUE:
osteoprogenitor cells, osteoblasts, osteocytes, Osteoclasts
35
bone tissue Cells are surrounded by matrix - ____ water - ____ protein - ____ mineral salts
25% 25% 50%
36
derived from mesenchymal stem cells
Osteoprogenitor Cells
37
is a resting cell that can differentiate into an osteoblast and secrete bone matrix
Osteoprogenitor Cells
38
Morphologically, they comprise the periosteal cells that form the innermost layer of the periosteum and the endosteal cells that line the marrow cavities, the osteonal (Haversian) canals, and the perforating (Volkmann’s) canals.
Osteoprogenitor Cells
39
is the differentiated bone-forming cell that secretes bone matrix /type I collagen and bone matrix proteins (BMPs)
Osteoblast
40
processes communicate with other osteoblasts and with osteocytes by gap junctions.
Osteoblast
41
Are mature bone cells derived from osteoblasts that became trapped in lacunae
Osteocytes
42
They are responsible for maintaining the bone matrix.
Osteocytes
43
synthesize new matrix, as well as participate in matrix degradation → maintain calcium homeostasis
Osteocytes
44
arranged with their long axes in the same direction as the lamellae.
Osteocytes
45
Are multinucleated cells originating from granulocyte-macrophage progenitors
Osteoclasts
46
Play a role in bone resorption
Osteoclasts
47
Are bone-resorbing cells present on bone surfaces where bone is being removed or remodeled
Osteoclasts
48
a shallow bay called a _________ can be observed in the bone directly under the osteoclast.
resorption bay (Howship’s lacuna)