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The Skeletal System S Bone Classification S Long bones: arms S Short bones: wrists S Flat bones: scapula S Irregular bones: vertebrae Identify Bone Shapes! Long Bones: Parts S Epiphysis: “knobby” ends of the long bones S Articular cartilage: Outside portion of the epiphysis which provides smooth glide for joints S Diaphysis: The narrow, length section of a long bone S Periosteum: outermost covering of fibrous tissue on the bone Long Bones: Parts Cont. S Compact bone: section of the bone with no gaps which makes up the wall of the diaphysis S Spongy bone: section of the bone with thin layer of bone with gaps which makes up the epiphysis S Medullary cavity: hollow chamber in the middle of the diaphysis S Endosteum: lines the medullary cavity and houses the bone-forming cells S Marrow: connective tissue found in the gaps of bones. Intramembranous vs. Endochondral S Bones classified by the way they develop S Most bones are endochondral S Please look at page 198 in your book and crate a Venn Diagram to highlight the major differences between intramembranous bone development and endochondral bones