Uberon definition : An orbitalis muscle is a rudimentary nonstriated muscle (smooth muscle) that crosses
from the infraorbital groove and sphenomaxillary fissure and intimately united with
the periosteum of the orbit. It is often called Muller's muscle. One characteristic
of Horner's Syndrome is enophthalmos (retraction of the eyeball into the orbit due
to paralysis of the orbitalis muscle that spans the inferior orbital fissure). Its
function is eyeball protrusion.;
Uberon synonym : orbital muscle of muller; orbitalis; orbital muscle;
An orbitalis muscle is a rudimentary nonstriated muscle (smooth muscle) that crosses
from the infraorbital groove and sphenomaxillary fissure and intimately united with
the periosteum of the orbit. It is often called Muller's muscle. One characteristic
of Horner's Syndrome is enophthalmos (retraction of the eyeball into the orbit due
to paralysis of the orbitalis muscle that spans the inferior orbital fissure). Its
function is eyeball protrusion.