Interior of skull and dural sinuses

Question 1

paranasal sinuses made by

Answer 1

frontal
ethmoid
maxilla

Question 2

oral cavity connects with what, so if there is an infection what can happen

Answer 2

roof of oral cavity connects with maxillary sinus,

so if there is an oral infection it can go into the maxillary sinus

Question 3

main contents of anterior, middle and posterior cranial fossa

Answer 3

anterior- frontal lobe
middle- temporal lobe
posterior- cerebellum

Question 4

christa galli

Answer 4

located on the ethmoid bone ( with cribriform plate and olfactory foramina)
- it attaches the falx cerebrum

Question 5

falx cerebrum

Answer 5

modified portion of dura matter that divides the brain into two halves
attached anteriorly by christa gali

Question 6

CN 7 and 8 enter, exit?

Answer 6

7 8 ( facial and vestibulocochlear) enter internal auditory meatus

7 exits thru stylomastoid foramen
8 stays in ear

Question 7

contents of anterior cranial fossa *

Answer 7

frontal lobe of brain
crista galli
cribriform plate (with olfactory nerve I )
foramen cecum- where emissary veins from nasal mucosa go to dural sinuses

Question 8

contents of middle cranial fossa*

Answer 8

temporal lobe
optic canal (II opthalmic artery )
superior orbital fissure ( III, IV, V 1 VI superior ophthalmic vein
forament rotundum - V2
foramen ovale- v3
foramen spinosum- middle meningeal artery / vein
foramen lacerum- fat
carotid canal- ICA , carotid nerve plexus
sella turcica- pituitary
groove for middle meningeal artery

Question 9

contents of posterior cranial fossa *

Answer 9

cerebellum
pons and medulla oblongata
tentorium cerebelli
foramen magnum- medulla oblongata, vertebral arteries, meningeal arteries
Hypoglossal canal - XII
internal auditory meatus - VII, VIII
condylar canal and groove for transverse sinus

Question 10

tentorium

Answer 10

separates brain from cerebellum

Question 11

layers (again)

Answer 11

• skin
• periosteum
• bone
• dura
• — periosteal layer
• —-dural layer
• subdural space
• arachnoid
• subarachnoid - CSF
• pia

Question 12

what drains into the dural venous sinuses***

Answer 12

vertebral venous plexus from pelvis - bastions
emissary veins from scalp
emissary veins from nasal mucosa (foramen cecum?)
angular vein* (via superior ophthalmic vein) – from face and nose— [instead of going straight to jugular]

Question 13

superior saggital sinus receives blood from*?

Answer 13

blood from nasal cavity, meningeal vein and superior cerebral vein
- occipital sinus also drains into it

Question 14

inferior saggital sinus joins ____ to form ____***

Answer 14

joins the great cerebral vein to form the straight sinus

Question 15

straight sinus empties into ____ which is located where***

Answer 15

straight sinus empties into confluence of sinuses located in the internal occipital protuberance
(inferior sinus + great cerebral vein = straight sinus)
(straight sinus + superior sinus —> confluence of sinuses

Question 16

where does transverse sinus begin, becomes ___

Answer 16

at confluence of sinuses ( occipital protuberance)

becomes sigmoid sinus

Question 17

Superior and inferior petrosal sinuses

Answer 17

drain cavernous sinus

• superior drains into transverse sinus
• inferior exits jugular foramen and drains into the jugular vein

Question 18

sigmoid sinus becomes _____ once it crosses ___*

Answer 18

sigmoid becomes internal jugular vein once it exits the jugular foramen

Question 19

where are the cavernous sinuses located

Answer 19

in middle cranial fossa on either side of the hypophyseal fossa (Sella turcica– where pituitary gland is located)

Question 20

what runs through the cavernous sinus* (horizontally)

Answer 20

internal carotid artery

VI- abducens

Question 21

what runs laterally to cavernous sinus *(superior to inferior)

Answer 21

III- oculomotor
IV-Throclear
V1- opthalmic
V2- maxillary

Question 22

what drains into cavernous sinus**

Answer 22

• superior and inferior ophthalmic veins
• central vein of the retina

[some of the facial vein joins with ophthalmic veins and drain into the cavernous sinus]

Question 23

cavernous sinus problems (like thrombus, maxillary sinus infections, aneurysm of ICA….. can result in*****

Answer 23

Damage III, IV, VI

Paresis ( muscle weakness)* of muscles supplied by these

Question 24

Vertebral artery (origin goes thru)

Answer 24

originates from subclavian artery

goes thru transverse foramen of C1- C6 and enter foramen magnum of skull

Question 25

vertebral vein (origin, goes thru)

Answer 25

originates in skull

-goes thru C1-c7 and drains into subclavian