Clinical Significance

• Clinical Significance: Horner Syndrome

  Horner syndrome, also known as oculosympathetic paresis, occurs due to an interruption in the sympathetic nerve supply to the eye.
• 1. Miosis (Constriction of the Pupil)

  • The affected pupil is smaller than normal due to the loss of sympathetic innervation to the dilator pupillae muscle, leading to a constricted pupil.

  1. Partial Ptosis (Drooping of the Eyelid)

  • There is a mild drooping of the upper eyelid due to the loss of sympathetic stimulation to Müller's muscle, a small muscle that helps keep the eyelid elevated.

  1. Anhidrosis (Loss of Hemifacial Sweating)

  • There is reduced or absent sweating on the affected side of the face (hemifacial anhidrosis) because the sympathetic supply to the sweat glands is disrupted.