Cranial Cavity: Dural Folds

Question 1

Contents

Answer 1

1. Brain and cranial nerves
2. Dural mater and it’s folds
3. Dural venous sinuses and emissary veins
4. Pituitary glands
5. Petrosal nerves
6. Internal carotid and middle meningeal blood vessels

Question 2

Dural folds

Answer 2

Duplication (2 layers) of inner layer dura acting as septa separating different parts of brain and stabilizing them

Question 3

Dural folds types (4)

Answer 3

1. Falx cerebi
2. Falx cerebelli
3. Tentorium cerebelli
4. Diaphragma sellae

Question 4

Falx cerebri shape

Answer 4

Sickle shaped fold

Question 5

Falx cerebri site

Answer 5

Between 2 cerebral hemispheres

Question 6

Falx cerebri attachment and sinuses related: apex (2)

Answer 6

1. Crista galli
2. Frontal crest

Question 7

Falx cerebri attachment and sinuses related: base (2)

Answer 7

1. Tentorium
   Contains straight sinus

Question 8

Falx cerebri attachment and sinuses related: upper border (2)

Answer 8

Convex
1. Superior sagittal groove
Contains superior sagittal sinus

Question 9

Falx cerebri attachment and sinuses related: lower border (1)

Answer 9

Free and concave
Contains inferior sagittal sinus

Question 10

Falx cereblli shape

Answer 10

Sickle shaped fold

Question 11

Falx cerebelli site

Answer 11

2 cerebellar hemispheres

Question 12

Falx cerebelli attachment and sinus related

Answer 12

Above: internal occipital protuberance
Below: foramen magnum
Attached to: internal occipital crest
Contains: occipital sinus

Question 13

Tentorium cerebelli shape

Answer 13

Tent shaped fold

Question 14

Tentorium cerebelli site

Answer 14

Separate cerebellum and occipital lobe cerebrum

Question 15

Tentorium attachments and sinuses related: free border

Answer 15

U shaped forming Tentorial notch surrounding midbrain
Attached to: anterior clinoid process

Question 16

Tentorium attachments and sinuses related: attached border

Answer 16

Attached on both sides to
1. Posterior clinoid process
2. Superior petrosal sulci
3. Transverse sulci
Contains:
1. Straight sinus: middle at its attachment with Falx cerebri
2. Superior petrosal sinus: in front
3. Transverse sinus: behind in attached borders on both sides

Question 17

Diaphragma sellae site

Answer 17

Covering sella turcica and pituitary gland

Question 18

Diaphragma sellae attachment

Answer 18

Attached to 4 clinoid processes

Question 19

Where do free and attached borders cross each other

Answer 19

Petrous bone apex (attached lies deep to free)

Question 20

3 cranial nerves pierce dura at the point of crossing of free and attached borders?

Answer 20

1. Oculomotor 3rd cranial nerve: in front of the point
2. Trochlear 4th cranial nerve: at the point
3. Trigeminal 5th cranial nerve: behind the point

Question 21

Blood supply: anterior cranial fossa (2)

Answer 21

1. Anterior ethmoidal blood vessels
2. Posterior ethmoidal blood vessels

Question 22

Blood supply: middle cranial fossa

Answer 22

1. Middle meningeal artery from maxillary artery
2. Accessory meningeal artery from maxillary artery

Question 23

Blood supply: posterior cranial fossa

Answer 23

Meningeal branches of:
1. Occipital artery
2. Vertebral artery
3. Ascending pharyngeal artery

Question 24

Nerve supply: anterior cranial fossa

Answer 24

Anterior ethmoidal nerve

Question 25

Nerve supply: middle cranial fossa

Answer 25

1. Meningeal branch of maxillary nerve
2. Nervus spinosus from Mandibular nerve trunk

Question 26

Nerve supply: posterior cranial fossa

Answer 26

1. Meningeal branch of vagus nerve
2. Meningeal branch of hypoglossal nerve