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Cranial Bones
Axial Skeleton Lab
| Term | Definition |
|---|---|
| Frontal Bone | shell shaped bone forming the anterior cranium and the superior orbits |
| Parietal Bones (2) | large bones forming most of the superior and lateral aspects of the cranium |
| Temporal Bones (2) | bones that form the inferolateral aspects of the skull |
| External Auditory/ Acoustic meatus | a passageway that guides sound waves to the tympanic membrane (ear drum). Deep to the ear drum is the middle ear which contains three small bones (malleus, incus and stapes) that are responsible for directing sound waves from the ear drum to the inner ear |
| mandibular fossa | A depression on the temporal bone where the mandible articulates with the skull. The mandibular fossa of the temporal bone and the condyle of the mandible come together to form a joint called the temporomandibular joint. |
| Mastoid Process | Enlargement on the skull posterior to the earlobe. Site of attachment for muscles that move the skull. |
| Occipital Bone | large bone forming most of the posterior wall and base of the skull |
| Foramen Magnum (great Hole) | The brain stem extends through the foramen magnum to connect to the spinal cord |
| Occipital Condyles | The rounded _____ articulate with the atlas vertebra (C1), allowing the head to move up and down in a “yes” movement and a side-to-side tilt movement |
| Sphenoid Bone | a butterfly shaped bone in the middle of the skull forming the posterior wall of the orbits. It is considered the keystone of the skull because it articulates with all of the cranial bones. |
| Optic foramen | Round hole in each posterior orbit. It is a passageway for the Optic nerve (II) which carries visual information to the brain. |
| Sella Turcica | Depression on the sphenoid bone (inside the brain case) that protects and houses the pituitary gland. |
| Ethmoid Bone | the deepest bone of the skull, it lies between the nasal bones and the sphenoid. |
| Cribriform Plate | Flat portion of the ethmoid bone on either side of the crista galli. The olfactory bulbs lie on the cp. The olfactory foramina are small holes in the cp that allow olfactory nerves to pass through skull from the nasal cavity into the olfactory bulbs |
| Crista Galli | Midline projection of the ethmoid bone into the brain case. A membrane holding the brain in place attaches to this structure. |
Created by:
Andreuh
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