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23 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Classification of Bones
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Long
Short Short Irregular |
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Intended Learning Outcomes
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Describe bone in terms of its cells, fibers and ground substance
Describe the General Structure of Bones List the cell types involved in bone production and remodeling. Describe the Microscopic architecture of mature compact bone Haversian canal lacunae canaliculi Volkmann’s canal |
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A special form of very dense C.T =
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Bone
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Blood cell formation
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produces RBC and all types of WBC
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T/F
periosteum. It is very vascular and has a rich nerve supply. |
t
info: It does not cover articular cartilage of bones. |
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trabeculae) aka endosteum.
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endosteum
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Preparation of Bone Section
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Decalcification
Calcification Ground Section: |
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Types of bone tissue
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Based on texture of cross sections
Based on matrix arrangement Based on maturity Based on developmental origin |
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Types of bone tissue
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. Flat: These bones have a large surface area. e.g.- scapula (shoulder blade), hip bone.
Their function is to increase the area for attachment of muscles. d. Irregular: examples include -vertebrae, individual skull bones. |
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Based on matrix arrangement, bone tissue can be classified as follows
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Lamellar bone (secondary bone tissue):
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Lamellar bone (secondary bone tissue): Lamellar bone is mature bone with collagen fibers arranged in lamellae. In spongy bone, lamellae are arranged parallel to each other, whereas in compact bone, they are concentrically organized around a vascular canal, termed a Haversian canal.
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spongy Bone
they are concentrically organized around a vascular canal, termed a |
Haversian canal.
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Woven bone is =
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(Non-lamellated or primary bone tissue):
mature or immature = |
immature bone with collagen fibers arranged in irregular random arrays, containing smaller amounts of mineral substance and a higher proportion of osteocytes than lamellar bone.
is temporary and eventually is converted to lamellar bone. |
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Immature bone
define = |
(primary bone tissue): Immature bone is woven bone.
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Mature bone
define = |
(secondary bone tissue): Mature bone characteristically is lamellar bone. Almost all bones in adults are lamellar bones.
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Woven or immature or coarsely bundled
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Proportions of the Collagen / Cells / proteoglycans/ mineral
Proportions of the Collagen / Cells / proteoglycans/ mineral all newly formed bone in embryo & children healing fractures tooth sockets sutures of cranial bones Physical characteristics = |
less strong
bends rather than “snaps” less radio-opaque |
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Mature Bone
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Cells with flat lacunae
Collagen arranged in layers Mineral more than seen in woven Physical characteristics: |
Strong, breaks (snaps) rather than bends
more radio-opaque |
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Microscopic architecture of mature compact bone
Lamellae of compact bone have three major patterns: |
concentrically
circumferential lamellae (Inner & Outer) Interstitial lamellae. |
Angular fragments of previous concentric & circumferential lamellae can fill the gap between Haversian systems. They are called interstitial lamellae.
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Haversian System (Osteon):
Primary structural unit of compact bone = |
Angular fragments of previous concentric & circumferential lamellae can fill the gap between Haversian systems. They are called interstitial lamellae.
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Only in compact bone
Arranged around a Haversian canal Thick wall, narrow canal Concentric tubular layers = Haversian lamellae Layers are 3 to 7 μm thick, Lamellae vary from 4 to 20 in a system Osteocytes arranged also in concentric layers Collagen fibers are parallel to each other within each lamella but are oriented perpendicularly to those in the neighboring lamellae. Canaliculi communicate with Haversian canal, peripheral canaliculi curve back |
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mature spongy bone =2ct
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Spongy mass composed of trabeculae, plates, tubules, globular shells
No Haversian systems (osteons) |
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Periosteum is not found =
5ct |
In area where tendon and ligaments insert on bone
On ends that are covered with articular cartilage On surfaces of sesamoid bone (locations where a tendon passes over a joint) On suprascapular area On neck of the femur |
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Sharpey’s fibers
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At the sites where very firm attachment of tendon or ligament to the bone is necessary, the collagen fibers perforate the bone matrix.
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Cement line is what =
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Thick layer of mineralized matrix deficient in collagen fibers
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Haversian canals connect with each other by transverse or oblique =
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Volkmann canals
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