Medulla oblongata

Question 1

What forms brainstem?

Answer 1

Midbrain
Pons
Medulla

Question 2

Answer 2

Question 3

What is the medulla continuous with?

Answer 3

Spinal cord

Question 4

Where does the medulla exit?

Answer 4

Foramen magnum

Question 5

What fissures present on medulla? (3)

Answer 5

Anterior median fissure
Ventrolateral sulcus
Posteriolateral sulcus

Question 6

What nerve is present at junction between pons and medulla?

Answer 6

CNVI- abducens

Question 7

What nerves present ventrolateral sulcus?

Answer 7

CN XII- hypoglossal

Question 8

What nerves present in posterolateral sulcus?

Answer 8

CN IX, CN X, and CN XI

Question 9

What is main lvl of decussation?

Answer 9

Medulla
75% motor fibres

Question 10

Label

Answer 10

Question 11

What does outer portion of medulla contain?

Answer 11

Fasiculus gracilis
Fasiculus cuneatus (white matter)

Question 12

What is function of medulla?

Answer 12

1) Responsible for autonomic functions e.g vomit
2) Control of ventilation- signals from the carotid and aortic bodies
3) BP- baroreceptors

Question 13

Where are carotid and aortic bodies found?

Answer 13

Medulla oblongata

Question 14

How is respiration controlled by medulla?

Answer 14

1) Respiration regulated by groups chemoreceptors
2) Sense direct changes in blood acidity
3) Signals sent to intercostal and phrenic muscles
4) Contraction rate changed

Question 15

Answer 15