CT anatomy ch 2

Aqueous humor

A watery, clear solution that fills the anterior cavity of the eye

Bulbus oculi

The eyeball

C-1 and C-2

The first two cervical vertebrae; C1 is the atlas and C2 is the axis

Calvaria

The upper part of the skull

Cavernous sinus

A space, or cavity, on either side of the dorsum sellae of the sphenoid bone

Condyle of the mandible

Rounded projection on the ramus of the mandible that articulates with the mandibular fossa of the temporal bone

Ethmoid sinus

Air-filled cavity in the ethmoid bone; one of the paranasal sinuses

External auditory canal

Passageway in the external ear that transmits sound vibrations to the tympanic membrane

Frontal bone

The bone of the cranium that forms the forehead

Frontal lobe

The portion of the cerebrum that is located in the anterior cranial fossa and is anterior to the central sulcus

Frontal sinus

Air-filled cavity in the frontal bone; one of the paranasal sinuses

Mandible

Bone of the lower jaw

Masseter muscle

The muscle that acts to close the jaw, a muscle of mastication

Mastoid process

The projection on the temporal bone located posterior to the ear

Maxillae

Bones that form the upper jaw

Maxillary sinus

Cavity within the maxillary bone; one of the paranasal sinuses

Nasal conchae

Bony ridges that project medially into the nasal cavity from the lateral walls of the nasal cavity

Nasal septum

Partition in the center of the nasal cavity; formed by the vomer bone and the perpendicular plate of the ethmoid bone

Occipital bone

The bone that forms the back of the skull and the base of the cranium

Optic chiasma

Region, just anterior to the pituitary gland, where the right and left optic nerves meet and some fibers cross over to the opposite side

Optic nerves

Bundles of nerve fibers that carry visual impulses from the retina of the eye to the optic chiasma

Optic tracts

Bundles of fibers in the visual pathway between the optic chiasma and the thalamus

Paranasal sinuses

Air-filled cavities in the ethmoid, sphenoid, frontal, and maxillary bones that are lined with mucous membrane and connect with the nasal cavity

Parietal bone

The bone of the cranium immediately posterior to the frontal bone; forms the top of the head

Petrous ridge

Rough region of the temporal bone that extends medially toward the center of the cranial vault

Ramus of the mandible

Portion of the mandible that projects superiorly from the body of the mandible

Sigmoid sinus

S-shaped channel that passes through the petrous portion of the temporal bone and drains blood and cerebrospinal fluid into the internal jugular vein

Sphenoid bone

The butterfly-shaped bone that extends from one side of the cranium to the other and forms a portion of the cranial floor

Sphenoid sinus

Air-filled cavity in the sphenoid bone; one of the paranasal sinuses

Temporal bone

The bone that forms the side of the cranium and surrounds the ear

Temporal lobe

Most lateral portion of the cerebrum; separated from the parietal lobe of the cerebrum by the lateral fissure

Vitreous humor

Jellylike substance that fills the posterior cavity of the eye, between the lens and the retina; also called vitreous body

Zygoma

Bone that forms the prominence of the cheek; zygomatic bone

Zygomatic arch

Bridge or span on the lateral side of the skull; formed by the zygomatic process of the temporal bone and the temporal process of the zygomatic bone