BIOL 171 Lecture Notes - Lecture 6: Hyaline Cartilage, Medullary Cavity, Haversian Canal
Document Summary
Skeletal system composed of many different tissues cartilage, bone tissue, epithelium, nerve, blood forming tissue, adipose, dense connective tissue dynamic and ever-changing throughout life. Bone functions shape/structure support blood cell formation storage (calcium, fat, minerals) protection mobility/movement. Histology of bone: histology: study of structure of microscopic cells connective tissue: cells separated by hard matrix. Osteogenic cells: undifferentiated cells found beneath periosteum, endosteum divide to replace themselves or can differentiate to become osteoblasts. Osteoblasts cells: found beneath periosteum and endosteum form matrix and collagen fibers but can"t divide differentiate into osteocytes when surrounded by matrix and enclosed in lacunae. Osteoclast cells huge cells formed from fused monocytes (white blood cells) located beneath endosteum, periosteum secrete enzymes that dissolve bone matrix function in bone growth, maintenance, repair, remodelling. 30% organic matrix (collagen fibers give strength, flexibility -- like rebar) Bones that contain red marrow flat bones: cranial bones pelvis ribs sternum proximal humerus and femur.
