Cranium Contents

Question 1

Meninges: layers

Answer 1

Dura mater = external, thick, fibrous
Arachnoid mater = thin, intermediate
Pia mater = delicate internal

Question 2

True spaces

Answer 2

Always present

Subarachnoid = filled ith CSF

Question 3

Potential spaces

Answer 3

Not always present, occur after trauma
Extra/epidural
Subdural

Question 4

Extradural space

Answer 4

Btw. skull + dura
Normally, outer layer of dura = firmly attached to skull
Trauma - can become fluid-filled + cause vascular hemorrhage
Bleeding = rupture of meningeal a. or dural venous sinus - extradural hematoma

Question 5

Dura mater

Answer 5

2 layers in brain, 1 in SC
External periosteal = attached to skull + contains meningeal a.
Internal meningeal = close to arachnoid, follows inner contour + continuos with SC dura through foramen magnum
Layers separate - dural partitions + sinuses

Question 6

Dural partitions: name

Answer 6

Falx cerebri
Falx cerebelli
Tentorium cerbelli
Sellar diaphragm

Question 7

Falx cerebri

Answer 7

Largest
Btw. hemispheres, in longitudinal fissure
Ant. = crista gali
Post. = int. occipital protuberance + tentorium
Free border = associated with corpus
Fuses with tentorium, post. to corpus

Question 8

Falx cerebelli

Answer 8

Vertical
Btw. cerebellar hemispheres
Attached int. occipital crest + tentorium
Inf. to tentorium