EXCI 254 Chapter Notes - Chapter 7: Inferior Nasal Concha, External Occipital Protuberance, Inferior Orbital Fissure
15 Jan 2017
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Document Summary
Skeletal system divided into 2 parts: axial skeleton: The bones that hold the limbs to the trunk of the body (pectoral and pelvic girdles) Skull: composed of both cranial and facial bones. Cranial bones: form the rounded cranium, which completely surrounds and encloses the brain. 8 bones make up the cranium: the unpaired ethmoid, frontal, occipital, sphenoid bones, and the paired parietal and temporal bones. These bones also provide attachment sites for several jaw, head, and neck muscles. 14 facial bones form the face: paired maxillae, nasal, lacrimal, zygomatic, palatine bones, inferior nasal conchae, and the unpaired vomer and mandible. They protect entrances to the digestive and respiratory systems as well as providing attachment sites for facial muscles. The largest cavity is the cranial cavity, which encloses, protects, and supports the brain and has an adult volume of about 1300 to 1500 cubic centimeters. Within the orbits are two large openings, called the superior orbital fissure and inferior orbital fissure.
