Question

which cranial nerve pathology may present with ptosis, miosis, and anhidrosis?
cn iii palsy
bells palsy
cn vi palsy
horners syndrome

Explanation:

• CN III palsy: Causes ptosis (due to levator palpebrae superioris muscle innervation loss), but usually has mydriasis (dilated pupil) rather than miosis.
• Bell's palsy: Affects facial nerve (CN VII). Presents with unilateral facial muscle weakness (e.g., drooping of the mouth, inability to close the eye on the affected side), not ptosis, miosis, and anhidrosis.
• CN VI palsy: Involves abducens nerve. Leads to lateral rectus muscle paralysis (inability to abduct the eye), no ptosis, miosis, or anhidrosis.
• Horner's syndrome: Results from disruption of the sympathetic innervation to the eye and face. Leads to ptosis (due to loss of Müller's muscle innervation, which is a sympathetic - innervated smooth muscle in the eyelid), miosis (unopposed parasympathetic constriction as sympathetic - mediated dilation is lost), and anhidrosis (loss of sympathetic - mediated sweating) on the affected side.

Answer:

Horner's syndrome