Osteology Lab 5A - Cranial Cavity Flashcards
What is filled by the frontal lobes of the cerebral hemispheres
anterior cranial fossa
What 4 bones form the anterior cranial fossa
Orbital plates of the frontal bone
Lesser wings of sphenoid bone
Body of the sphenoid bone
Ethmoid bone
The Middle Cranial Fossa is formed by what 3 bones
Body of the sphenoid
Greater wings of the sphenoid
Temporal bones
The midline depression of the middle cranial fossa is filled by the
pituitary gland
The lateral depressions of the middle cranial fossa is filled by the
temporal lobes of the cerebral hemispheres
What is the largest & deepest cranial fossa
Posterior Cranial Fossa
What travels through the foramen magnum of the occipital bone
brainstem to spinal cord
vertebral arteries
CN XI
The Posterior Cranial Fossa is filled by the ________ and __________
brainstem (midline) &
cerebellum (lateral depressions)
Bony processes located on external surface anterolateral to the foramen magnum
Occipital condyles
The posterior cranial fossa is formed primarily by what 2 bones
Temporal bones
Occipital bones
(With small contributions from the body of the sphenoid & parietal bones)
What supports the pons and medulla regions of the brainstem
Basilar part of the occipital bone
What travels along the internal surface of the basilar part of the occipital bone
Basilar artery
What articulates with the C1 vertebra (atlas)
Occipital condyles
Palpable bony projection in the midline that closely approximates the location of the confluence of the sinuses
External occipital protuberance
What canal internally lies along the anterolateral edges of the foramen magnum
Hypoglossal canal
What canal externally lies along the anterior aspect
of the occipital condyles
Hypoglossal canal
Prominence in the midline posterior to the foramen magnum that is overlaid by the confluence of sinuses
Internal occipital protuberance
2 attachment sites for the cerebral falx
Internal occipital protuberance
Frontal Crest
Raised line extending inferiorly from the internal occipital protuberance that is the attachment site for the cerebellar falx
Internal occipital crest
What bone surrounds the inner ear
petrous part of the temporal bone
What bone is located in the cranial base between the
sphenoid & occipital bones
petrous part of the temporal bone
What bone forms a prominent ridge along the
internal aspect of the cranial base which separates the middle & posterior cranial
fossa
petrous part of the temporal bone
What is the opening located along the posterior aspect of the petrous ridge
Internal acoustic meatus
What transmits CN VII and CN
VIII
Internal acoustic meatus
What permits passage of the internal carotid artery & the postganglionic sympathetic fibers traveling on it
carotid canal
What lies in between the petrous ridge of the temporal bone and the occipital bone
Jugular foramen
What does CN IX, X, and XI travel through
jugular foramen
Internal jugular vein begins here & receives direct drainage from the sigmoid & inferior petrosal sinuses
jugular foramen
The body of the sphenoid bone contains the
sphenoid sinus
The hypophyseal fossa is filled by the ___________ and covered by the ________
pituitary gland ; sellar diaphragm
Posterior aspect of sella turcica
dorsum sellae
Articulates with basilar portion of the occipital bone
Dorsum sellae
Attachment of the cerebellar tentorium
Anterior & Posterior clinoid processes
The foramen ovale is on what wing of the sphenoid
Greater
What transmits the middle meningeal artery
Foramen spinosum
Space between the greater & lesser wings of the sphenoid bone
superior orbital fissure
The optic canal transmits what 2 things
CN II and the ophthalmic artery
By birth, what opening is covered by cartilage and is not continuous into the middle cranial fossa
Foramen lacerum
The cribriform plate contains numerous openings for the
passage of the fibers of CN
CN I
