Identify the nerve in the given diagram whose palsy causes lateral gaze palsy.
Ans: B. B
(Ref Gray’s 41e p437, 664, 670; 40/e p430; Snells 9/e p544)
- Lateral gaze palsy is due to paralysis of lateral rectus, which is supplied by the abducens nerve.
Structures Marked in the Diagram (cavernous sinus):
- A = Oculomotor nerve
- B = Abducens nerve
- C = Ophthalmic nerve
- D = Maxillary nerve
Structures in lateral wall of sinus from above downwards:
- Oculomotor (III) nerve.
- Trochlear nerve (IV)
- Ophthalmic (V1) nerve
- Maxillary (V2) nerve
- Trigeminal ganglion
Structures passing through centre of sinus (content):
- Abducent (V1th) nerve.
- Internal carotid artery.
|Tributaries of cavernous sinus|
|From the orbit||From the brain||From the meninges|
Superior ophthalmic vein°
A branch of the inferior ophthalmic
Central vein of retina°
Superficial middle cerebral vein°
Inferior cerebral veins°
Frontal trunk of the middle menin‑
|Draining channels of cavernous sinus|
Into the transverse sinus through petrosal sinus°
Into the internaljugularvein through inferior petrosal sinus°
Into the pterygoid plexus through emissary veins°
Into the facial vein through ophthalmic vein°