Neuro 5: 4th Ventricle

Question 1

fourth ventricle is situated between

Answer 1

Cerebellum and brainstem (open medulla & pons)

Question 2

Lateral border of fourth ventricle contains

Answer 2

• Superior cerebellar peduncle
• Lateral Angle (forming lateral recess)
• Inferior cerebellar peduncle
• Gracile
• Cuneate

Question 3

floor of the fourth ventricle contains

Answer 3

• Medullary stria: seperating pontine part of the floor from medullary part of the floor
• Median (longitudinal) sulcus
• Tegmental surface of pons: Vestibular Area +Sulcus limitans
• Dorsal surface of open medulla: inferior fovea, hyoglossal and vagal trigones

Question 4

Roof of fourth ventricle contains

Answer 4

* Superior medullary velum: connecting the 2 superior cerebellar peduncles
* Middle and inferior medullary velums: connecting the 2 inferior cerebellar peduncles
* Telachordia: where choroid plexus invaginates 4th ventricle
* Foramen of magendie

Question 5

enumerate recesses of the 4th ventricle

Answer 5

Median Recess:
* upper wall formed by superior medullary velum
* Lower wall formed by cerebellum

2 Lateral recesses:
* located at the lateral angle of the 4th ventricle
* Each recess drain into subarachinoid space by lateral Aperatures known as foramen of Lushka

Question 6

4th ventricle communicates with the 3rd ventricle by

Answer 6

Cerebral Aqueduct of Sylvius (at the upper angle)

Question 7

4th ventricle communicates with central canal of medulla at the …..Angle

Answer 7

Lower Angle

Question 8

4th ventricle communicates with Subarachnoid space by

Answer 8

• Median Aperature (foramen of magendie) opens into cisterna magna
• 2 lateral Aperatures (foramen of Lushka) open into ponto=medullary cistern

Question 9

Site of choroid plexus of the 4th ventricle

Answer 9

invaginates lowermost area of the roof of the ventricle above foramen of magendie

Question 10

Shape and blood supply of choroid plexus

Answer 10

• T shaped with 2 arms extending to the lateral recess
• Blood supply: Posterior inferior cerebellar Artery

Question 11

Definition and causes of hydrocephalus

Answer 11

• Abnormal Accumilation of CSF in the brain
• Causes: obstruction in Forman of magendie, foramen of Lushka or Cerebral aqueduct of sylvius