Health Sciences 2300A/B Lecture Notes - Lecture 3: Haversian Canal, Bone, Sesamoid Bone

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 2300A/B
• Professor: Gillian Corbo

Document Summary

Class 3 note bone tissue and axial skeleton. Two classifications: types of bony tissue, cortical (compact, spongy (trabecular, shape of bone, long, short, flat, irregular, sesamoid. Cortical (compact) bone: makes up the surface of bones, composed of osteons, concentric lamellae around a haversian canal, osteons are aligned in parallel for strength. Spongy bone: makes up the interior of bones, does not contain osteons lightens bones, lamellae arranged in irregular pattern of columns (trabeculae, space between trabeculae allow for bone marrow. Clinical correlate: osteoporosis, minerals in bone decrease as we age, reduction of quantity of bone tissue, bones become brittle and fracture easily, often due to hormones, leading cause of broken bones in the elderly. Irregular bones: complex shape, vary in compact vs. spongy, sesamoid bones, develop in tendons d/t stress, increases lever arm. Bone cells: osteoblasts build bone osteoclasts carve out bone. Structure organization of the skeleton: connection of axial to appendicular, shoulder girdle, scapula, clavicle, pelvic girdle, os coxa.