Separating these areas is the bridge of bone called the zygomatic arch. Lateral View of SkullĪ view of the lateral skull is dominated by the large, rounded cranium above and the upper and lower jaws with their teeth below ( Figure 7.3.3). The superior nasal concha is located just lateral to the perpendicular plate, in the upper nasal cavity. It is much smaller and out of sight, above the middle concha. A third bony plate, also part of the ethmoid bone, is the superior nasal concha. Located just above the inferior concha is the middle nasal concha, which is part of the ethmoid bone. The larger of these is the inferior nasal concha, an independent bone of the skull. When looking into the nasal cavity from the front of the skull, two bony plates are seen projecting from each lateral wall. 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. Below the orbit is the infraorbital foramen, which is the point of emergence for a sensory nerve that supplies the anterior face below the orbit.įigure 7.3.2 – Anterior View of Skull: 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.
#Essential anatomy 3 vs 5 skin
This provides for passage of a sensory nerve to the skin of the forehead. Located near the midpoint of the supraorbital margin is a small opening called the supraorbital foramen. The upper margin of the anterior orbit is the supraorbital margin. The orbit is the bony socket that houses the eyeball and muscles that move the eyeball or open the upper eyelid. Also seen are the upper and lower jaws, with their respective teeth ( Figure 7.3.2). This view of the skull is dominated by the openings of the orbits and the nasal cavity. The anterior skull consists of the facial bones and provides the bony support for the eyes, teeth and structures of the face and provides openings for eating and breathing. Which bone (yellow) is centrally located and joins with most of the other bones of the skull? Anterior View of Skull Watch this video to view a rotating and exploded skull, with color-coded bones. Figure 7.3.1 – Parts of the Skull: The skull consists of the rounded cranium that houses the brain and the facial bones that form the upper and lower jaws, nose, orbits, and other facial structures. The 22nd bone is the mandible (lower jaw), which is the only moveable bone of the skull. In the adult, the skull consists of 22 individual bones, 21 of which are immobile and united into a single unit.
The rounded cranium 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 cranium, or cranial vault ( Figure 7.3.1). The skull is the skeletal structure of the head that supports the face and protects the brain.
Identify the bony openings of the skull.Identify the bones and structures that form the nasal septum and nasal conchae, and locate the hyoid bone.Name the bones that make up the walls of the orbit and identify the openings associated with the orbit.Define the paranasal sinuses and identify the location of each.
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