Neuro: Blood supply of the brain

Question 1

Course of Vertebral A in the skull

Answer 1

1. Enters the skull Through foramen Magnum
2. Runs on the anterior surface of medulla oblongata
3. Ends at lower border of pons by uniting with the other vertebral A to form Basillar A

Question 1

Origin of vertebral A

Answer 1

First part subclavian A

Question 2

Enumerate Branches of Verebral A

Answer 2

• Posterior Inferior cerebellar
• Posterior Spinal A (sometimes)
• Anterior spinal
• Medullary branches

Question 3

Distribution of posterior inferior cerebellar A

Answer 3

• Posterior part of inferior surface of cerebellum + Inferior vermis hemisphere
• Dorsolateral Zone of medulla
• Inferior Cerebellar Peduncle
• Choroid plexus of 4th ventricle

Question 4

Occlution of Posterior Inferior Cerebellar A leads to

Answer 4

lateral Medullary syndrome

Question 5

Posterior spinal Artery orginates from

Answer 5

either vertebral A or (its branch) posterior Inferior Cerebellar A

Question 6

Course of posterior spinal artey

Answer 6

Descends along the line of posterior spinal Roots of the spinal cord

Question 7

Distribution of posterior spinal A

Answer 7

• Posterior 1/3 of spinal cord
• Gracile & Cunate Nuclei

Question 8

Anterior spinal Artery arises from

Answer 8

Uppermost part of vertebral A

Question 9

course of Anterior Spinal A

Answer 9

2 Anterior spinal A descend obliquely downwards and medially to unite at lower surface of medulla into a single Anterior spinal Artery which descends in Anterior median Longitudinal fissure of spinal Cord

Question 10

Distribution of Anterior Spinal A

Answer 10

• Anterior 2/3 of Spinal Cord
• Medial Zone of medulla

Question 11

Distribution of Medullary branches of Vertebral A

Answer 11

Middle Zone of Medulla

Question 12

Origin of Basillar Artery

Answer 12

Union of 2 Vertebral A at lower surface of pons

Question 13

Course & end of basillar A

Answer 13

1. Passes along Basillar groove of pons
2. Ends by dividing into 2 terminal Branches (posterior Cerebral A)

Question 14

Enumerate branches of Basillar A

Answer 14

• Anterior Inferior Cerebellar A
• Superior Cerebellar A
• Pontine branches A
• Labrinthyine Artery
• (2 terminal) Posterior Cerebral A

Question 15

Distribution of Anterior Inferior Cerebellar A

Answer 15

• Middle Cerebellar Peduncle
• Small portion ofv inferior Surface of cerebellum that is Anterior
• (Sometimes) Larinthyine A

Question 16

Enumerate pontine branches of basillar A & their distribution

Answer 16

• Paramedian: Median Zone of basis of pontis
• Short-circumfrencial: Lateral Zone of basis of pontis
• Long-circumfrencial: Posterior Zone (tegmentum) of basis of pontis

Question 17

Course & supply of Labrinthyne A

Answer 17

Accompanies 7th & 8th Cranial Nerves (facial & Vestibulo-choclear) into Internal Auditory meatus to supply Internal Ear

Question 18

Distribution of Superior Cerebellar A

Answer 18

• Superior cerebellar Peduncle
• Superior Surface of Cerebellar hemisphere