head: meninges (extra)

Question 1

what separates the occipital lobes from the cerebellum?

Answer 1

tentorium cerebelli

Question 2

tentorium cerebelli: what is it fixed to anteriorly and posteriorly?

Answer 2

Fixed to anterior clinoid processes & petrous portion of temporal bone anterior
Fixed to internal surface of occipital bone posterior

Question 3

what Forms “roof” over pituitary gland and allows passage of infundibulum?

Answer 3

diaphragma sellae

Question 4

the transverse sinus becomes the sigmoid sinus where? which side of these is usually dominant?

Answer 4

at petrous portion of temporal bone

Left usually dominant

Question 5

where does the middle meningeal artery enter the cranium?

which branch of middle meningeal artery underlies the pterion?

Answer 5

enters via foramen spinosum

frontal branch

Question 6

what is the corpus callosum?

Answer 6

thick band of nerve fibers that divides the cerebral cortex lobes into left and right hemispheres. It connects the left and right sides of the brain allowing for communication between both hemispheres.

Question 7

what are the 3 sulcus that divide the brain into 4 lobes?

Answer 7

Central sulcus
Lateral sulcus
Parieto-occipital sulcus

Question 8

what connects the two hemispheres of the cerebellum?

Answer 8

vermis

Question 9

what is the course of the internal carotid artery? - where does it enter the cranium (along with what)? where does it enter dura (medial to what? lateral to what?) Then joins…? terminates as? …

Answer 9

Enters cranium via carotid canal with sympathetic plexus

• -> courses Anteromedial in carotid groove of sphenoid
• -> lies in Cavernous sinus
• Enters dura medial to anterior clinoid process, lateral to optic chiasm
• Joins cerebral arterial circle (Willis)
• Terminates as anterior & middle cerebral arteries (anterior brain circulation)

Question 10

what structures cross the interal carotid artery? to enter what?

Answer 10

CN III, IV, & VI cross to enter superior orbital fissure

Question 11

what do the lateral venous lacunae do?

Answer 11

lateral expansions of superior sinus, drain CSF from subarachnoid space

Question 12

Plexus of veins bilateral to body of sphenoid, surround internal carotid arteries (cools blood). where do these drain?

Answer 12

cavernous sinuses- drain via superior and inferior petrous sinuses

Question 13

what are the “leptomeninges”?

Answer 13

arachnoid, arachnoid trabeculae, pia