The Skull.

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Presentation transcript:

The Skull

Axial Skeleton 80 bones Three major regions Skull Vertebral Column Thoracic Cage Supports the head, neck, and trunk Protects the brain, spinal cord and the organs of the thorax

The Skull 22 bones Divided into the cranium and face Most of the bones are flat with the exception of the mandible (jaw bone)

Cranium Cranium- Encloses and protects the brain Provides attachment sites for head and neck muscles There are 8 bones the make up the cranium Frontal Parietal (2) Temporal (2) Occipital Sphenoid Ethmoid These bones are held together by interlocking joints called sutures. They have a saw-toothed or serrated appearance.

Cranium

Face Face- Form the framework of the face Contain cavities for the special sense organs of sight, taste, and smell Provide openings for air and food passage Secure the teeth Anchor facial muscles

Face Made up of 14 bones Mandible-largest and strongest bone in the face Maxilla (2)-all facial bones except mandible articulate with maxillae; considered keystone bones of face Zygomatic (2) Nasal (2) Lacrimal (2) Palatine (2) Vomer Inferior Nasal Conchae (2)

Hyoid Bone Not really part of the skull Lies inferior to mandible in anterior neck Only bone that does not articulate directly with another bone Anchored to temporal bones Functions Acts as a movable base for the tongue Attachment points for neck muscles that raise and lower the larynx during swallowing and speech