Meninges

Question 1

Three layers of meninges

Answer 1

Dura mater, arachnoid mater, pia mater

Question 2

Layers of Dura Mater

Answer 2

1) Outer periosteal layer - firmly attached to skull, meningeal arteries, continuous with periosteum on outer surface of skull
2) Inner meningeal layer - close to arachnoid mater, continuous with spinal dura mater

Question 3

Falx cerebri

Answer 3

Meningeal dura mater goes between two hemispheres; attached to crista galli and frontal crest

Question 4

Tentorium cerebelli

Answer 4

Meningeal dura mater separates cerebellum from cerebrum; attached to occipital and temporal bones, but free anteriorly and medially

Question 5

Falx cerebelli

Answer 5

Meningeal dura mater between two cerebellar hemispheres

Question 6

Diaphragma sellae

Answer 6

Meningeal dura mater covering hypophysial fossa; infundibulum passes through opening in the center, connecting pituitary gland with brain

Question 7

Arterial supply of dura mater

Answer 7

1) Anterior meningeal arteries (branches of ethmoidal)
2) *Middle meningeal artery (branch of maxillary) - enters through foramen spinosum
3) Accessory meningeal arteries (maxillary) - enters through foramen ovale
4) Posterior meningeal artery, et al (ascending pharyngeal artery - jugular foramen, hypoglossal canal; occiptital artery - jugular foramen, mastoid foramen; vertebral artery - foramen magnum)

*Biggest and most important

Question 8

Innervation of dura mater

Answer 8

Small meningeal branches of trigeminal [V], vagus [X], C1-C3

Question 9

Extradural space

Answer 9

Potential space between dura mater and bone

Can fill with blood –> BAD

Question 10

Subarachnoid space

Answer 10

Contains CSF