Unit 4 - Head and Neck: Dural Venous Sinuses (Ex. III)

Question 1

confluence of sinuses

Answer 1

@ P edge of tentorium cerebelli

junction of S sagittal, straight, occipital, and transverse sinuses

Question 2

S sagittal sinus

Answer 2

runs in attaches S border of falx cerebri

ends in confluence of sinuses

Question 3

I sagittal sinus

Answer 3

runs in free I edge of falx cerebri

ends in confluence of sinuses

Question 4

straight sinus

Answer 4

runs in space formed by union of falx cerebri and tentorium cerebelli
receives I sagittal sinus and great cerebral v.
drains into confluence of sinuses

Question 5

transverse sinuses

Answer 5

run along attached P-L margins of tentorium cerebelli
P - join @ confluence of sinuses
A - drain into sigmoid sinuses
form grooves in O and P bones along the way

Question 6

sigmoid sinuses

Answer 6

run in deep grooves of C and T bones

rain into IJVs @ jugular foramen

Question 7

occipital sinus

Answer 7

runs in free edge of falx cerebelli

ends in confluence of sinuses

Question 8

cavernous sinuses

Answer 8

on either side of sella turcica
unique:
  - contain plexus of thin-walled vv.
  - internal carotid a. - surrounded by sympathetic internal carotid n. plexus
  - oculomotor n. (CN III)
  - trochlear n. (CN IV)
  - ophthalmic and maxillary divisions (CN V1 and V2) of trigeminal n. (CN V)
  - abducens n. (CN VI)
receive:
  - S and I ophthalmic vv.
  - sphenoparietal sinuses
  - superficial middle cerebral vv.
  - central vv. of retina
drain into S and I petrosal sinuses P 
drain into pterygoid venous plexus I
connected by intercavernous sinuses

Question 9

S petrosal sinuses

Answer 9

drain cavernous sinuses
w/in attached margins of tentorium cerebelli along top of petrous part of T bones
empty into sigmoidal sinuses

Question 10

I petrosal sinuses

Answer 10

drain cavernous sinuses
pass through groove between petrous part of T bones and basilar part of O bone
empty into sigmoid sinuses @ origin of IJVs
communicate w/ vertebral venous plexus via basilar plexus

Question 11

What are they?

Answer 11

valveless venous space that form as a result of separation of periosteal and meningeal layers of the dura
they drain most of the large vv. of the brain, skull, orbit, and inner ear
from there they drain into IJVs