Orbit

Orbit: Anatomy & ContentsKey facts about the anatomy of the orbit
~ 3 min

Let us examine the structure of the orbit (orbita). It is a bony cavity in which the eye, the visual organ, is located. In addition to the eyeball, there are also muscles, the lacrimal gland and some other formations in the orbit.

Orbit (orbita)
Orbit (orbita)

The opening inserting into the orbit is called the orbital opening (aditus orbitae). The posteromedial part of the orbit is called the apex of the orbit and leads to the optic canal (canalis opticus).

Orbital opening (aditus orbitae)
Orbital opening (aditus orbitae)

The orbit has four walls:

  • a roof (paries superior)

    Roof (paries superior)
    Roof (paries superior)
  • a medial wall (paries medialis)

    Medial wall (paries medialis)
    Medial wall (paries medialis)
  • a lateral wall (paries lateralis)

    Lateral wall (paries lateralis)
    Lateral wall (paries lateralis)
  • a floor (paries inferior)

    The roof is formed by: (facies orbitalis alae majoris ossis sphenoidalis)
    The roof is formed by:

    Floor (paries inferior)

  • the orbital surface of the frontal bone (facies orbitalis ossis frontalis)

    Orbital surface of frontal bone (facies orbitalis ossis frontalis)
    Orbital surface of frontal bone (facies orbitalis ossis frontalis)
  • the lesser wing of the sphenoidal bone (ala minor ossis sphenoidalis)

    Lesser wing of sphenoid bone (ala minor ossis sphenoidalis)
    Lesser wing of sphenoid bone (ala minor ossis sphenoidalis)

    The medial wall is formed by:

  • the orbital plate of the ethmoidal bone (lamina orbitalis ossis ethmoidalis)

    Orbital plate of ethmoidal bone (lamina orbitalis ossis ethmoidalis)
    Orbital plate of ethmoidal bone (lamina orbitalis ossis ethmoidalis)
  • the frontal process of the maxilla (processus frontalis maxillae)

    Frontal process of maxilla (processus frontalis maxillae)
    Frontal process of maxilla (processus frontalis maxillae)
  • the lacrimal bone (os lacrimale)

    Lacrimal bone (os lacrimale)
    Lacrimal bone (os lacrimale)
  • the body of the sphenoidal bone (corpus ossis sphenoidalis)

    Body of sphenoidal bone (corpus ossis sphenoidalis)
    Body of sphenoidal bone (corpus ossis sphenoidalis)

    The lateral wall is formed by:

  • the orbital surface of the greater wing of the sphenoidal bone (facies orbitalis alae majoris ossis sphenoidalis)

    Orbital surface of greater wing of sphenoidal bone
    Orbital surface of greater wing of sphenoidal bone (facies orbitalis alae majoris ossis sphenoidalis)
  • the orbital surface of the zygomatic bone (facies orbitalis ossis zygomatici)

    Orbital surface of zygomatic bone (facies orbitalis ossis zygomatici)
    Orbital surface of zygomatic bone (facies orbitalis ossis zygomatici)

    The floor is formed by:

  • the orbital surface of the maxilla (facies orbitalis maxillae)

    Orbital surface of maxilla (facies orbitalis maxillae)
    Orbital surface of maxilla (facies orbitalis maxillae)
  • the orbital surface of the zygomatic bone (facies orbitalis ossis zygomatici)

    Orbital surface of zygomatic bone (facies orbitalis ossis zygomatici)
    Orbital surface of zygomatic bone (facies orbitalis ossis zygomatici)
  • the orbital process of the palatine bone (processus orbitalis ossis palatini)

Orbital process of palatine bone (processus orbitalis ossis palatini)
Orbital process of palatine bone (processus orbitalis ossis palatini)

In the area of the orbit there are several foramina and fisures through which pass various vessels and a nerve.

Let’s take a closer look at them.

TitleContentsConnected to
Optic canal
(canalis opticus)
Optic nerve, ophthalmic arteryMiddle cranial fossa
Optic canal (canalis opticus)
Optic canal (canalis opticus)
Superior orbital fissure
(fissura orbitalis superior)
Anterior meningeal branch of the anterior ethmoidal artery, superior ophthalmic vein, oculomotor nerve, trochlear nerve, abducent nerve, ophthalmic nerveMiddle cranial fossa
Superior orbital fissure (fissura orbitalis superior)
Superior orbital fissure (fissura orbitalis superior)
Inferior orbital fissure
(fissura orbitalis inferior)
Infraorbital artery, inferior ophthalmic vein, infraorbital nerve, zygomatic nervePterygopalatine fossa, infratemporal fossa
Inferior orbital fissure (fissura orbitalis inferior)
Inferior orbital fissure (fissura orbitalis inferior)
Nasolacrimal canal
(canalis nasolacrimalis)
Nasolacrimal ductNasal cavity
Nasolacrimal canal (canalis nasolacrimalis)
Nasolacrimal canal (canalis nasolacrimalis)
Anterior and posterior ethmoidal foramina
(foramen ethmoidale anterius et foramen ethmoidale posterius)
Anterior and posterior ethmoidal arteries, veins and nervesNasal cavity
Anterior ethmoidal foramen (foramen ethmoidale anterius)
Anterior ethmoidal foramen (foramen ethmoidale anterius)
Posterior ethmoidal foramen (foramen ethmoidale posterius)
Posterior ethmoidal foramen (foramen ethmoidale posterius)
Infraorbital canal
(canalis infraorbitalis)
Infraorbital artery, vein and nerveFacial region
Infraorbital canal (canalis infraorbitalis)
Infraorbital canal (canalis infraorbitalis)
Zygomatico-orbital foramen
(foramen zygomaticoorbitale)
Zygomatico-orbital artery and cochlear nerveFacial region
Zygomaticoorbital foramen (foramen zygomaticoorbitale)
Zygomaticoorbital foramen (foramen zygomaticoorbitale)
Supraorbital foramen
(foramen supraorbitale)
Supraorbital artery, vein, nerveFacial region
Supraorbital foramen (foramen supraorbitale)
Supraorbital foramen (foramen supraorbitale)
Dictionary

Orbit

orbit
orbita
orbital opening
aditus orbitae
optic canal
canalis opticus
roof
paries superior
medial wall
paries medialis
lateral wall
paries lateralis
floor
paries inferior
orbital surface of frontal bone
facies orbitalis ossis frontalis
lesser wing of sphenoid bone
ala minor ossis sphenoidalis
orbital plate of ethmoidal bone
lamina orbitalis ossis ethmoidalis
frontal process of maxilla
processus frontalis maxillae
lacrimal bone
os lacrimale
body of sphenoidal bone
corpus ossis sphenoidalis
orbital surface of greater wing of sphenoidal bone
facies orbitalis alae majoris ossis sphenoidalis
orbital surface of zygomatic bone
facies orbitalis ossis zygomatici
orbital surface of maxilla
facies orbitalis maxillae
orbital surface of zygomatic bone
facies orbitalis ossis zygomatici
orbital process of palatine bone
processus orbitalis ossis palatini
superior orbital fissure
fissura orbitalis superior
inferior orbital fissure
fissura orbitalis inferior
nasolacrimal canal
canalis nasolacrimalis
anterior ethmoidal foramen
foramen ethmoidale anterius
posterior ethmoidal foramen
foramen ethmoidale posterius
infraorbital canal
canalis infraorbitalis
zygomaticoorbital foramen
foramen zygomaticoorbitale
supraorbital foramen
foramen supraorbitale
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