Skull and Cranial Cavity

Question 1

Vertebral artery arises from

Answer 1

Subclavian a.

Question 2

Vertebral a. enters

Answer 2

Basilar a.
poterior cerebral a.

Note: Supplies deep neck and brain via circle of willis

Question 3

Internal carotid a. arises

Answer 3

Common carotid a.

Question 4

Internal carotid a. enters

Answer 4

Middle cerebral a.
Anterior cerebral a.

Note: With basilar artery forms major input into circle of willis

Question 5

Middle meningeal a. arises from

Answer 5

Maxillary a

Question 6

Middle meningeal a. enters

Answer 6

Arteries of dura mater

Note: Vulnerable to bleed from fracture of pterion

Question 7

Transverse sinus arises from

Answer 7

Confluence of sinuses

Question 8

Transverse sinus enters

Answer 8

Sigmoid sinus

Question 9

Sigmoid sinus arises from

Answer 9

Transverse sinus
Internal vertebral venus plexus
Cavernous sinus

Question 10

Sigmoid sinus enters

Answer 10

IJ vein
Internal vertebral venous plexus

Question 11

Cavernous sinus arises from

Answer 11

Veins of the deep face(pterygoid venous plexus)
Veins of the orbit
Veins of the brain

Question 12

Cavernous sinus enters

Answer 12

Pterygoid venous plexus
Sigmoid sinus

Note: Vulnerable to infection due to venous connection to external face via ophthalmic veins and pterygoid venous plexus

Question 13

Dura mater

Answer 13

Outer tough layer of connective tissue covering CNS. In skull is directly deep to skull bones. Dura mater is innervated by branches of the trigeminal nerve CN V.

Question 14

Arachnoid mater

Answer 14

Middle thin layer of connective tissue covering CNS. Adhered to dura mater and connected to pia mater by numerous small extensions called trabeculae

Question 15

Subarachnoid space

Answer 15

Space between arachnoid and pia containing cerebrospinal fluid (CSF)

Question 16

Pia Mater

Answer 16

Deepest very thin layer of connective tissue covering CNS (invisible in prepared bodies)