Base Of Brain: Interpeduncular Fossa

Question 1

Site

Answer 1

Occupies base central region and midbrain anterior aspect

Question 2

Boundries

Answer 2

Diamond-shaped space bounded by:
1. Optic chiasma (anterior)
2. Optic tracts (antero-lateral)
3. Pons upper border (posterior)
4. Cerebral peduncles (posterolateral)

Question 3

Contents

Answer 3

Most contents belong to hypothalamus
1. Tuber cinereum
2. Mammillary bodies
3. Posterior perforated substance
4. Oculomotor nerves

Question 4

Tuber cinereum

Answer 4

Slightly elevated grey matter area behind optic chiasma

Question 5

Tuber cinereum attachment

Answer 5

Gives attachment to posterior lobe infundibulum of pituitary gland

Question 6

Mammillary bodies

Answer 6

2 small rounded elevations on each side of median plane in fossa middle part

Question 7

Mammillary bodies Afferents

Answer 7

From fornix column

Question 8

Mammillary bodies efferents

Answer 8

1. To thalamus (mammillo-thalamic tract)
2. To brain stem tegmentum (mammillo-tegmental tract)

Question 9

Posterior perforated substance site

Answer 9

Behind mammillary bodies in angle between cerebral peduncles

Question 10

Posterior perforated substance pierced by

Answer 10

Central branches of posterior cerebral arteries

Question 11

Oculomotor nerves site

Answer 11

Emerge from fossa posterior part just medial to cerebral peduncles