Meninges (Task 1)

Question 1

Outermost meningeal layer

Answer 1

Dura Mater divided into Periosteal layer and Meningeal layer

Question 2

Middle meningeal layer

Answer 2

Arachnoid Mater

Question 3

Innermost meningeal layer

Answer 3

Pia Mater

Question 4

Two main dural projections and their function

Answer 4

Falx Cerebri
Falx Cerebelli
Limit displacement of brain

Question 5

Position of falx cerebri

Answer 5

Vertical fold between right and left cerebral hemispheres

Question 6

Position of falx cerebelli

Answer 6

Horizontal fold between cerebrum and cerebellum

Question 7

Function of diaphargma sellae and potential pathology

Answer 7

Dura mater with a hole for passage of pituitary stalk

May be damaged in transphenoidal surgery and leak CSF

Question 8

Function of tentorial notch and potential pathology

Answer 8

Forms roof over posterior cranial fossa to shield superior cerebellum and support occipital lobes
Raised ICP can cause a tentorial herniation resulting in loss of consciousness, contralateral hemiparesis and ipsilateral pupil dilation

Question 9

Innervation of meninges

Answer 9

Meningeal branches of Trigeminal (CN V) and Vagus (CN X) nerves
Some contribution from Upper Cervical Spinal Nerve