MEDT220 Lecture Notes - Lecture 15: Clastic Rock, Sphenoid Bone, Exostosis
25 May 2017
School
Department
Course
Professor
Document Summary
Complete organs composed of dense, hard connective tissue, rich supply of blood vessels and nerves. Osseous (l/gk = bony) tissue: connective tissue. Bones of fetus are composed of cartilage. More flexible and less dense due to lack of intercellular calcium salts. During embryo development, calcium salts are deposited in cartilage. Gradual replacement of cartilage and its intercellular substance by immature bone cells and calcium deposits. Produces immature bony tissue that replaces cartilage. Large cells that reabsorb or digest bone. Digest bone tissue form the inner sides enlarging the inner cavity so bones do not become overly thick and heavy. Bone is a dynamic tissue constantly being reshaped by osteoblasts and osteoclasts. Bone remodeling makes bone a living tissue. Osteoblasts and osteoclasts work together to tear down and rebuild bone. Allows bone to respond to mechanical stress placed on it. Osteoblasts lay down mineral bone matter (calcium salts) Osteoclasts remove excess bone debris (smooth bone)
