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Microscopic Structure of Compact Bone

Microscopic Structure of Compact Bone. What are osteocytes? Osteocytes and layers of intercellular material form concentric rings around a central canal, forming a cylinder-shaped unit called an osteon (Haversian system).

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Microscopic Structure of Compact Bone

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  1. Microscopic Structure of Compact Bone What are osteocytes? Osteocytes and layers of intercellular material form concentric rings around a central canal, forming a cylinder-shaped unit called an osteon (Haversian system). Each central canal contains blood vessels and nerve fibers surrounded by loose connective tissue.

  2. Label Femur Diagram Handout • Review the following terms: • Distal • Proximal

  3. Microscopic Structure

  4. Bone types Remember: Bones differ greatly in size and shape, but are similar in structure. Long Bones – work as levers; EX: bones of upper and lower limbs Short Bones – short and cubed shaped; found in wrist and ankles Flat Bones - broad surfaces for protection of organs and attachment of muscles; EX: ribs, cranial bones Irregular Bones – vertebrae and some bones in skull

  5. Skeletal Organization The skeleton is divided into two major parts: Axial (???) skeleton Appendicular (???) skeleton

  6. Axial Skeleton Consists of the bony and cartilage portions that support and protect the organs of the head, neck, and trunk.

  7. Axial Skeleton parts: Skull – made of the cranium and facial bones Hyoid bone – found in the neck between the lower jaw and the larynx (this bone supports the tongue) Vertebral column – vertebrae, sacrum, and coccyx Thoracic cage – ribs (12 pair) and sternum

  8. Appendicular Skeleton Consists of bones of the upper and lower limbs and the bones that anchor the limbs to the axial skeleton.

  9. Appendicular Parts: Pectoral Girdle – scapula and clavicle Upper Limbs – humerus, radius ulna, carpals, metacarpals, phalanges Pelvic Girdle – pelvis Lower Limbs – femur, tibia, fibula, patella, tarsals, metatarsals, phalanges

  10. Which portion, axial or appendicular, do you think would have the largest number of bones? Table 7.1, p.137, shows the skeletal organization in a semi-outline format. ***Important bone terminology: Table 7.2, p.137

  11. Skeletal Diagram Label together Use 4 different colored highlighters to highlight by TYPE of bone (long, short, flat, irregular)

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