Hematoma: Clot forms in space between broken bone pieces. Area is inflamed and swollen.
Fibrocartilage callus: Repair; clot replaced by fibrocartilage, bone ends joined by collagen fibers.
Bony callus: Osteoblasts produce trabeculae of spongy bone and convert fibrocartilage to bony callus.
Remodeling: Osteoblasts produce compact bone on outer layer, osteoclasts reabsorb spongy bone to make medullary cavity if needed. Osteoclasts may also reabsorb compact bone to maintain proper shape overall.
Joints = sutures (immovable joints)
Fontanels – membranous regions where 2 or more bones meet
Anterior fontanel – where parietal bones meet frontal bone; usually closes by 2 yrs of age
Permit compression during birth
Frontal bone (1) – forehead, part of nose, superior portions of orbits
Parietal Bones (2) – dorsal to frontal bone, form roof and part of sides of cranium
Occipital Bone (1) Most dorsal part, base of cranium
Foramen magnum – opening through which spinal cord joins brain
Occipital condyles – rounded processes on either side of foramen magnum, articulate with first vertebra (atlas)