Nation 2 Flashcards
The skull is divided into two portions:
- ________- forms a protective case around the brain
- ________ - situated anteriorly, it is comprised of several bones that form the facial skeleton.
- Neurocranium (braincase)
2. Viscerocranium (splanchnocranium)
- Roof of the cranial cavity
* Formed by potions of the frontal bone, left and right parietal bones, and occipital bone
Calvaria
Separates the frontal and two parietal bones
Coronal suture
Separates the two parietal bones
Sagittal suture
Separates the two parietal bones and the occipital bone
Lamboid suture
Landmark formed by the intersection of the sagittal and coronal sutures
Bregma
The most superior part of the skull
Vertex
______ forms anterior part of side of the skull and articulates with the parietal bone at the coronal suture
Frontal bone
_______ form the sides and roof of the cranium and articulates with each other in the midline at the sagittal suture, posteriorly they articulate with the occipital bones at the lambdoid suture
Parietal bones
The skull is completed at the sides by the _______ (squamous, tympanic, mastoid process, styloid process, zygomatic process), the greater wing of the _______, and the temporal process of the ________.
- temporal bone
- sphenoid bone
- zygomatic bone
Temporal process of the zygomatic bone + the zygomatic process of the temporal bone
Zygomatic arch
Thinnest part of the lateral wall of the skull. Parietal bone articulates with greater wing of the sphenoid bone, temporal bone, and frontal bone. Underlying the it is the anterior division of the middle meningeal artery (rupture causes an epidural hematoma) and vein.
Pterion
The nasal cavity is divided into two by the bony nasal septum- largely formed by the ____ and the perpendicular plate of the _______.
- vomer
- ethmoid bone
The ______ is the structure in which the pituitary gland is held and the sphenoid sinus just inferior.
Sella turcica
“Shelves” of the ethmoid bone that project into the nasal cavity from each side.
Superior and middle nasal conchae
Separate bone
Inferior nasal conchae
- Back of the head.
* Formed by the occipital bone, parietal bones, and mastoid parts of the temporal bones
Occiput
Palpable elevation in midline of occipital bone.
External occipital protuberance (inion)
Points of attachment for various muscles responsible for stabilizing the head on the neck and maintaining posture of the back.
Superior and inferior nuchal lines
Protuberances of the occipital bone. Function in articulation with the superior facets of the atlas (C1 vertebra).
Occipital condyle
Largest opening in the base of the skull, discussed later.
Foramen magnum
At about the middle of each occipital condyle- runs horizontally, the hypoglossal nerve (CN XII) emerges from it.
Hypoglossal canal
Midline tubercle on the basal part of the occipital bone, attachment sight for the superior constrictor muscle of the pharynx.
Pharyngeal tubercle
Gap between the occipital, sphenoid, and petrous part of the temporal bone. Filled with cartilage in life.
Foramen lacerum
Houses the superior end of the internal jugular vein, opens through the jugular foramen into the interior of the skull. CN IX, CN X, and CN XI emerge from the jugular foramen, located medial to the styloid process.
Jugular fossa
Transmits the internal carotid artery. First the canal runs vertically in the temporal bone, then turns abruptly to run anteriorly and medially emerging just above the foramen lacerum. The carotid canal is located immediately anterior to the jugular foramen.
Carotid canal
Attachment sight for muscles, posterior to the external acoustic meatus.
Mastoid process
Anteromedial to the mastoid process, varies in thickness and length, attachment sight for muscles.
Styloid process
Transmits the facial nerve (CN VII) and stylomastoid artery, located between the styloid process and the mastoid process.
Stylomastoid foramen
Passage leading inward through the tympanic portion of the temporal bone, located anterior to the mastoid process.
External acoustic meatus