Question
Identify the nerve in the given diagram whose palsy causes lateral gaze palsy.
A. A
B. B
C. C
D. D
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Correct Answer » B Explanation |
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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 |
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Superior ophthalmic vein° A branch of the inferior ophthalmic veinQ Central vein of retina° |
Superficial middle cerebral vein° Inferior cerebral veins° |
Sphenoparietal sinus° Frontal trunk of the middle menin‑ geal vein |
| Draining channels of cavernous sinus | |
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Into the transverse sinus through petrosal sinus° Into the internaljugularvein through inferior petrosal sinus°
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Into the pterygoid plexus through emissary veins° Into the facial vein through ophthalmic vein° |