cranial cavity

Question 1

meninges of brain

Answer 1

pia mater- on brain
CSF
arachnoid mater-separates the dura mater from the CSF

Duramater- outer most layer, covers until spinal cord, so epidural anesthesia only affects the spinal nerves- meningeal layer touching brain and periosteal layer touching skull

epidural space in skull is separate from the epidural space in the spinal cord

Question 2

dural venous sinuses

Answer 2

fluid (Blood) filled, two layers of dura mater split to form venous blood filled openings. CSF always made by choroid plexus and then filtered out by arachnoid granulations

• superior venous sinus
• transverse (lateral) sinus
• straight sinus
• superior petrosal sinus
• inferior petrosal sinus
• cavernous sinus- recieves blood from superior ophalmic sinus which recieves facial venous blood

Question 3

emisary veins

Answer 3

connect superficial veins to deep vein

Question 4

cerebral veins (bridging veins)

Answer 4

bridging the dural venous sinuses and the veins that are going down into the brain itself

Question 5

middle meningeal artery

Answer 5

on outside of dura mater

Question 6

innervation of the dura mater

Answer 6

trigeminal nerve is the major nerve supply to the dura mater (headaches)

meningeal branch of V1- brings innervation to tentorium cerebelli and a little in the front of cranium. (above upper eyelid)
branch of v2- medial temporal region (lower eyelid to upper lip)
branch of v3- lateral temporal region (lower lip and jaw)