Each side of the nasal cavity is triangular in shape, with a broad inferior space that narrows superiorly. The upper portion of the nasal septum is formed by the perpendicular plate of the ethmoid bone and the lower portion is the vomer bone. Inside the nasal area of the skull, the nasal cavity is divided into halves by the nasal septum. An anterior view of the skull shows the bones that form the forehead, orbits (eye sockets), nasal cavity, nasal septum, and upper and lower jaws. The 22nd bone is the mandible (lower jaw), which is the only moveable bone of the skull.įigure 2. Anterior View of Skull. In the adult, the skull consists of 22 individual bones, 21 of which are immobile and united into a single unit. The rounded brain case surrounds and protects the brain and houses the middle and inner ear structures. The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws. It is subdivided into the facial bones and the brain case, or cranial vault (Figure 1). The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain.
Locate and define the boundaries of the anterior, middle, and posterior cranial fossae, the temporal fossa, and infratemporal fossa.Locate the major suture lines of the skull and name the bones associated with each.List and identify the bones of the brain case and face.membraneous spaces between the skull bones of the fetus and infant where ossification is not complete.Coronoid Process: site of attachment for mastication muscles- protrudes when jaw is depressed.
Mandibular Condyle: articulates with temporal bone.Along with ethmoid, forms the nasal septum.Projections in lateral wall of nasal cavity.Part of lateral wall and floor of orbit.
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