Anatomy Flashcards
What are the two layers of the dura mater?
1) Periosteal Layer
2) Meningeal layer
Which layer of the dura mater makes dural foldings?
Meningeal layer
What are the 4 dural foldings?
1) Falx Cerebri
2) Tentorium Cerebelli
3) Falx Cerebelli
4) Diaphragma Sellae
What dural folding is the largest?
Falx Cerebri
What dural folding is the smallest?
Diaphragma Sellae
What is the function of the Falx Cerebri?
Separates cerebral hemispheres into right and left hemispheres
Where does the Falx Cerebri lie?
Longitudinal cerebral fissure
What are the 2 anterior attachment points for the Falx Cerebri?
1) Frontal crest of frontal bone
2) Crista Galli of ethmoid bone
What are the 2 posterior attachment points for the Falx Cerebri?
1) Internal occipital protuberance
2) Tentorium cerebelli
What are the 2 functions of the Tentorium Cerebelli?
1) Separates occipital lobes and cerebellum
2) Divides the cranial cavity into supratentorial and infratentorial compartments
The supratentorial cavity contains…?
The forebrain (Cerebrum)
The infratentorial cavity contains…?
The hindbrain (Cerebellum and Brainstem)
What is the anterior attachment point of the tentorium cerebelli?
Clinoid process of sphenoid bone
What is the anteriolateral attachment point of the tentorium cerebelli?
Petrous part of the temporal bone
What is the posteriolateral attachment point of the tentorium cerebelli?
Internal surface of occipital bone and part of the parietal bone
What is the function of the tentorial notch?
Allows the brainstem to extend to the medial fossa
What is the tentorial notch?
free border of the tentorium cerebelli
What is the function of the Falx Cerebelli?
Partially separates the cerebellar hemispheres
What is the location of the Falx Cerebelli?
Inferior to the tentorium cerebelli
What is the infundibulum?
The pituitary stalk
Where is the diaphragma sellae located?
Suspended between clinoid processes
What is the function of the diaphragma sellae?
Forms a partial roof over the sella turcica and covers the pituitary gland.
When is the diaphragma sellae an important landmark?
During pituitary surgery-pituitary tumors will extend above the diaphragma sellae (usually)
