Classification of bones: long bones: tubular shaft, ends are enlarged, dimensions don"t matter, flat bones: thin, all have outer covering of very dense bone, spongy bone inside. Ex skull, rib, sternum, part of scapula: pneumatized bones: bones with holes(sinuses) in them. Ex frontal bone: irregular bones: have structures sticking out on sides. Ex vertebra: short bones: usually cube shaped, sesamoid bone: forms in tendons. Vertebrae (26) variation in numbers may come in with caucyx and sacrum, Hyoid (1) high up in neck, muscles for swallowing and tongue attach; no other bones articulate with it, Diaphysis: the tubular shaft of a long bone. Epiphysis: the end portion of a long bone that has a separate ossification centre. Epicondyle: a non articular projection next to a condyle. Head: a large, rounded end of a bone. Neck: the part between the head and the diaphysis; usually separated into separate surgical and anatomical necks. Fissure: a hole, shaped more like a crack or cleft.