Orbitalis muscle

Orbitalis
Not to be confused with the Superior tarsal muscle or the circular fibres of the ciliary muscle, both of which are also known as Müller's muscle.wikipedia
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Heinrich Müller (physiologist)

Heinrich Müller
It was described by Heinrich Müller and is often called Müller's muscle.

Superior tarsal muscle

Müller's musclesuperior tarsalMueller muscle
Enophthalmos in Horner's syndrome is an illusion created by the subtle ptosis of the upper eyelid caused by paralysis of the superior tarsal muscle. While the orbitalis muscle is also known as Müller's muscle, the use of this term should be discouraged to avoid confusion with the superior tarsal muscle and the circular fibres of the ciliary muscle.
However, the same term is also used for the circular fibres of the ciliary muscle, and also for the orbitalis muscle that covers the inferior orbital fissure.

Smooth muscle

smooth muscle cellssmooth musclessmooth muscle cell
The orbitalis muscle is a vestigial or rudimentary nonstriated muscle (smooth muscle) that crosses from the infraorbital groove and sphenomaxillary fissure and is intimately united with the periosteum of the orbit.

Infraorbital groove

Sulcus infraorbitalisInfra-orbital groove
The orbitalis muscle is a vestigial or rudimentary nonstriated muscle (smooth muscle) that crosses from the infraorbital groove and sphenomaxillary fissure and is intimately united with the periosteum of the orbit.

Inferior orbital fissure

Fissura orbitalis inferiorinferior orbitalsphenomaxillary fissure
The orbitalis muscle is a vestigial or rudimentary nonstriated muscle (smooth muscle) that crosses from the infraorbital groove and sphenomaxillary fissure and is intimately united with the periosteum of the orbit.

Periosteum

pericraniumsubperiostealperiosteal
The orbitalis muscle is a vestigial or rudimentary nonstriated muscle (smooth muscle) that crosses from the infraorbital groove and sphenomaxillary fissure and is intimately united with the periosteum of the orbit.

Enophthalmos

apparently sunken eyeeye to sink inwardssunken ocular globes
While some attribute the enophthalmos of Horner's Syndrome to paralysis of the orbitalis muscle, this is inaccurate.

Horner's syndrome

Horner syndromeCongenital Horner's syndromeHorner’s syndrome
While some attribute the enophthalmos of Horner's Syndrome to paralysis of the orbitalis muscle, this is inaccurate. Horner's syndrome causes paralysis of the structures of the eye and orbit that receive sympathetic innervation.

Ptosis (eyelid)

ptosisblepharoptosisdrooping eyelid
Enophthalmos in Horner's syndrome is an illusion created by the subtle ptosis of the upper eyelid caused by paralysis of the superior tarsal muscle.

Ciliary muscle

ciliary musclesciliarycilia
While the orbitalis muscle is also known as Müller's muscle, the use of this term should be discouraged to avoid confusion with the superior tarsal muscle and the circular fibres of the ciliary muscle.

Human vestigiality

Human tailsvestigial remnantevolutionary remnants
The orbitalis muscle is a vestigial or rudimentary nonstriated muscle (smooth muscle) of the eye that crosses from the infraorbital groove and sphenomaxillary fissure and is intimately united with the periosteum of the orbit.