LECTURE: Contents of Cranial Cavity Flashcards
What part of the brain sits in each of these fossa?
anterior: frontal lobe
middle: temporal lobe
posterior: cerebellum
The brainstem transitions to the spinal cord as it passes through what opening?
foramen magnum
The brain is surrounded by three layer of connective tissue which comprise the …
meninges
What are the 3 layers of the meninges?
dura mater
arachnoid mater
pia mater
Which layer of the meninges is the tough outer layer?
dura mater
The dura mater has 2 layers which are the …
meningeal and periosteal dura
The areas where the meningeal and the periosteal dura separate form what structures?
dural septae and venous sinuses
The endocranium is made of which layer of the meninges?
periosteal layer adherent to internal periosteum
The meningeal layer forms ____ to help support the brain.
septae
Falx cerebri and the tentorium cerebelli are two examples of what?
septaes formed by the meningeal layer to help support the brain
The attachment of the dura to the bones in the floor of the skull is stronger than to ______.
calvaria
A blow to the cranium can detach the dura from what?
the calvaria
Will detaching the dura from the calvaria result in damage to bone?
no
What type of fractures tear the dura and result in leakage of CSF into the soft tissue of the neck, nose, ear or nasopharynx?
basal fractures
The middle, “webby” layer of the meninges
arachnoid mater
This layer of the meninges is loosely draped over the surface of the brain without diving into sulci.
arachnoid mater
This area contains CSF
subarachnoid space
Delicate layer in close contact to brain tissue
pia mater
Follows the contours of the brain and is difficult to remove from its surface
pia mater
A sickle-shaped double layer of dura mater which is located within the longitudinal fissure between the cerebral hemispheres.
falx cerebri
This runs from the crista galli to the internal occipital protuberance and reflects horizontally to form the tentorium cerebelli.
falx cerebri
Function of this is to reduce the side-to-side movement of the brain.
falx cerebri
What separates the occipital lobes of the cerebrum from the cerebellum?
tentorium cerebelli
The ___________ is attached laterally at the petrous portion of the temporal bone and anteriorly at the anterior clinoid processes of the sphenoid bone.
tentorium cerebelli