Neuro 2: Medulla Oblongata

Question 1

Shape and length of medulla oblongata

Answer 1

Conical in shape, 3 cm long

Question 2

Extensions of medulla oblongata

Answer 2

• Above: continuation with lower border of pons
• Below: continuous with spinal cord

Question 3

Open medulla forms

Answer 3

Part of 4th ventricle

Question 4

Enumerate contents of the ventrolaterlal surface of medulla

Answer 4

1. Anterior median fissure: continuous with the spinal cord
2. Pyramid: on each side of the anterior median fissure, produced by cortico-spinal tract
3. Anterolateral sulcus: between pyramid & olive, Exit of hypoglossal N
4. Olive: Posterolateral to Anterolaterlal sulcus, overlying Inferior olivary nucleus
5. Posterolateral sulcus: Between olive and Inferior cerebellar peduncle, **exit of (9,10,11) Vagus N, glossopharyngeal N & carnial root of accessory N **
6. Inferior cerebellar peduncle: connects medulla to cerebellum

Question 5

Dorsal surface of medulla is seperated from dorsal surface of pons by

Answer 5

Medullary stria

Question 6

Dorsal surface of medulla is bounded laterally by

Answer 6

Inferior cerebellar peduncles

Question 7

inferior fovea divides dorsal surface of open medulla into (from medial To lateral)

Answer 7

• Hypoglossal trigone
• Vagal trigone
• Vestibular Area

Question 8

Contents of Dorsal Surface of Closed medulla from medial to lateral

Answer 8

• posterior Median sulcus
• Gracile tract and tubercle
• Cunate tract and tubercle
• Tuberculum Cinereum: overlying spinal nucleus of trigemnal
• Inferior cerebellar peduncle