Base Of Brain: Anterior Part

Question 1

Anterior part of brain base

Answer 1

In front of Interpeduncular fossa

Question 2

Contents

Answer 2

1. Right and left optic nerves
2. Anterior perforated substance
3. Olfactory bulb and tract

Question 3

Right and left optic nerves

Answer 3

Join optic chiasma anterolateral aspect

Question 4

Anterior perforated substance shape

Answer 4

Rhomboid shaped

Question 5

Anterior perforated substance pierced by

Answer 5

Central branches of anterior and middle cerebral arteries

Question 6

Anterior border Anterior perforated substance

Answer 6

1. Olfactory trigon
2. striae

Question 7

Posterior border Anterior perforated substance

Answer 7

1. Optic tract
2. Uncus

Question 8

Medial border Anterior perforated substance

Answer 8

Optic chiasma

Question 9

Lateral border Anterior perforated substance

Answer 9

Lateral sulcus

Question 10

Above border Anterior perforated substance

Answer 10

Corpus striatum

Question 11

Below border Anterior perforated substance

Answer 11

ICA termination

Question 12

Olfactory bulb

Answer 12

1. Lies in contact with frontal lobe orbital surface
2. Rests on ethmoidal bone cribriform plate through which olfactory nerve filaments from nasal mucosa upper third pass to enter olfactory bulb

Question 13

Olfactory tract

Answer 13

Runs backwards from bulb and ends by dividing into:
1. Medial root (stria)
2. Lateral root (stria)

Question 14

Medial root

Answer 14

Passes medial and ends in indusium griseum of corpus callosum

Question 15

Lateral root

Answer 15

Passes lateral over anterior perforated substance and terminates in temporal lobe uncus

Question 16

Olfactory trigone

Answer 16

Pyramid
Area between the 2 roots sometimes forms a small elevation