<prompt> Enophthalmos is an uncommon feature of Horners syndrome. Enophthalmos is due to palsy of?Levator palpebrae superiorisSuperior tarsal muscleOrbitalis muscleInferior tarsal muscle  <response>: Enophthalmos sinking of the eye is the inward displacement of the eyeball. It results from paralysis of the orbitalis muscle a smooth muscle that spans the inferior orbital fissure and may contribute to maintaining the normal position of the eyeball. 