Anatomy and Cell Biology 3309 Lecture Notes - Lecture 8: Osteoblast, Perichondrium, Periosteum
3 Dec 2014
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Diaphysis: main shaft: epiphysis: ends of bone (proximal epiphysis is closer to the body, distal epiphysis is farther end from body, metaphysis: in between, articular surface of epiphysis are involved in joint formation and have articular cartilage (no perichondrium) instead of periosteum, marrow cavity: inner part of bone where hemopoeisis occurs; also yellow marrow (adipose tissue) due to keratin build up, compact bone: bone with no spaces, surrounding inner part, spongy/cancellous bone: bone with spaces, found on inner part of bone at epiphysis. Endosteum: types of mature bones based on shape: long, short, flat, irregular. Fibroblast-like cells found in both periosteum (osteogenic layer) and endosteum (make up the whole thing practically) Precursors that can differentiate into cells that make cartilage (chondroblasts), and bone (osteoblasts: osteoblasts (ob, osteocytes (oc) Cells that make bone; manufacture ground substance and fibers. A mature osteoblast that no longer divides. Once osteoblasts are surrounded by calcified matrix (bone) that they make, they are called osteocytes.
