Skeletal System pt. 2
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Transcript of Skeletal System pt. 2
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Skeletal System pt. 2
Microscopic Structure of BonesBone Development
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Agenda• Do Now• Introduce: Microscopic Structure of Bone • Bone Matrix Diagram• Introduce: Bone Growth and Development• Assign: Chapter Project• Homework Question• Exit Ticket
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Microscopic Structure• Osteocytes (osteo-: bone, -cyte:
cell) are located in small cavities in the matrix called lacunae.
• The extracellular (extra-: outside) matrix in bone tissue is hard material composed of collagen and inorganic salts
• Bones also contain nerves (ouch!) and blood vessels.
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Microscopic Structure• Lacunae are connected by canaliculi (singular:
canaliculus). This is how the cells share nutrients and communicate.
• Where do the blood vessels and nerves come in? o Lacunae are arranged in concentric (co:- same, -centric:
center) circles around osteonic canals.
o The group of rings that share the same osteonic canal are called an osteon
o The vertical osteonic canals are connected transversely by communicating canals.
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Whiteboard Practice
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Multiple ChoiceA: OsteonB: Osteonic CanalC: Periosteum D: Spongy Bone
?
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Multiple ChoiceA: LacunaB: Osteonic CanalC: Periosteum D: Spongy Bone?
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Multiple ChoiceA: OsteonB: Osteonic CanalC: Periosteum D: Spongy Bone
?
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Multiple ChoiceA: OsteonB: Osteonic CanalC: Periosteum D: Spongy Bone
?
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Multiple Choice• Identify the Lacunae
A
B
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Multiple Choice• Identify the Canaliculi
A
B
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Bone Development and Growth
Intramembranous Bones: Flat Bones
o Develop from sheet-like masses of connective tissue that form where future bones will be located
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Intramembranous Bone
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Endochondral Bone• Long Bones• Develop from masses of hyaline cartilage shaped
like bones.
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Long Bone Growth• In the developing body, the
epiphyseal disk separates the diaphysic ossification center and the epiphysic ossification center.
• The epiphyseal disk is a layer of cartilage that allows bones to continue to grow in length.
• When the growth centers meet and the cartilage disappears, the bone can no longer grow in length.
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Chapter Project
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Homework Questions• How can the epiphysial disk sustain damage?• What happens if this disk is damaged?
Write your answers into your notes. Come to class tomorrow prepared to discuss.
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Exit Ticket1. Epiphyseal Disk2. Epiphysic Ossification Center3. Diaphysic Ossification Center
A
B
C
D