MARCUS GUNN PHENOMENON:
- Elevation of ptotic lid with movement of jaw.
- Due to aberrant connection between 3rd nerve and mandibular division of 5th nerve.
- More common on left side.
- May be associated with superior rectus weakness.
- Grading :
Moderate- 3-6 mm elevation of ptotic lid.
Severe- >= 7 mm elevation of ptotic lid.
INVERSE MARCUS GUNN PHENOMENON:
- Increase in ptosis on jaw movement.
- Due to synkinesis between pterygoids (5th nerve) and orbicularis (7th nerve).
- Also known as ATOIN SYNDROME.
REVERSE MARCUS GUNN PHENOMENON :
- Lateral displacement of jaw on touching cornea.
- Due to synkinesis between ophthalmic division (I) and mandibular division (III) of 5th nerve.
- Seen in supranuclear 5th nerve palsy.
1 comment:
Simplicity always makes it easy to learn. .lyked it.
Post a Comment