BIOL 205 Lecture Notes - Lecture 17: Intramembranous Ossification, Foramen Lacerum, Endochondral Ossification
Document Summary
Chapter 7b: axial skeleton: the skull o o o o o o o o o. Houses special sense organs (eyes, ears, nose, mouth) Flat bones spongy bone hemopoietic (erythrocytes and blood cells) Periosteum compact bone spongy bone compact bone periosteum. Ossification (osteogenesis) is the formation and development of bone. 156-157) development of bone in the fetus for flat bones o. Ossification centers form within thickened regions of mesenchyme. Osteoid (precursor to solid bone matrix) undergoes calcification (osteoid = uncalcified extracellular matrix, becomes calcified) Woven (primary) bone and surrounding periosteum form trabeculae of woven bone. Lamellar (secondary) bone replaces woven bone as compact and spongy bone form. Intramembranous ossification occurs in ribs, initiated by mesenchymal cells, osteoblasts produce osteoid o o o o. Facial bones [mandible, maxilla, lacrimal bone, nasal, zygomatic, vomer] The skull also has several smaller cavities the orbits (eye sockets) the oral cavity (mouth) the nasal cavity the paranasal sinuses.
