Orbit (anatomy)
The seven bones which articulate to form the orbit. yellow = Frontal bone blue = Zygomatic bone purple = Maxillary bone red = Sphenoid bone brown = Ethmoid bone aqua = Palatine bone green = Lacrimal bone
Gray's	subject #46 188
MeSH	Orbit
Dorlands/Elsevier	o_05/12594914

In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated. Image File history File links Orbital_bones. ... The frontal bone (os frontale, TA: A02. ... The zygomatic bone (malar bone) is a paired bone of the human skull. ... The maxillae are the largest bones of the face, except for the mandible, and form, by their union, the whole of the upper jaw. ... Figure 1 : Sphenoid bone, upper surface. ... Your skull is in your back (this is obviously not true, I was just testing the website to see if it really works) The ethmoid bone (os ethmoidale) is a bone in the skull that separates the nasal cavity from the brain. ... The palatine bone is a bone situated at the back part of the nasal cavity between the maxilla and the pterygoid process of the sphenoid. ... The lacrimal bone (Os Lacrimale), the smallest and most fragile bone of the face, is situated at the front part of the medial wall of the orbit . ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo. ... Anatomical drawing of the human muscles from the Encyclopédie. ... It has been suggested that temporal fenestra be merged into this article or section. ... The human eye. ... In medicine, Adnexa refers to the appendages of an organ. ...

It can also mean the skin which surrounds the eye of a bird.

Contents

• Extraocular muscles
• Nerves: cranial nerves II, III, IV, V, and VI
• Blood vessels
• Fat

Categories: Anatomy stubs | Muscular system | Eye ... Nerves (yellow) Nerves redirects here. ... Cranial nerves are nerves which start directly from the brainstem instead of the spinal cord. ... MRI scan of human eye showing optic nerve. ... The oculomotor nerve () is the third of twelve paired cranial nerves. ... The fourth of twelve cranial nerves, the trochlear nerve controls the function of the superior oblique muscle, which rotates the eye away from the nose and also moves the eye downward. ... The trigeminal nerve is the fifth (V) cranial nerve, and carries sensory information from most of the face, as well as motor supply to the muscles of mastication (the muscles enabling chewing), tensor tympani (in the middle ear), and other muscles in the floor of the mouth, such as the... The sixth of twelve cranial nerves, the abducens nerve is a motor nerve that innervates the lateral rectus muscle and therefore controls each eyes ability to abduct (move away from the midline). ... The arterial system The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... Fats consist of a wide group of compounds that are generally soluble in organic solvents and largely insoluble in water. ...

Bones

In humans, seven bones make up the bony orbit: Human beings are defined variously in biological, spiritual, and cultural terms, or in combinations thereof. ...

• Frontal bone (Pars orbitalis)
• Zygomatic bone (Orbital process of the the zygomatic bone)
• Maxillary bone (Orbital surface of the body of the maxilla)
• Sphenoid bone (Orbital surface of greater wing of sphenoid bone)
• Ethmoid bone (Lamina papyracea)
• Palatine bone (Orbital process of palatine bone)
• Lacrimal bone

The frontal bone (os frontale, TA: A02. ... The orbital or horizontal part of the frontal bone (pars orbitalis) consists of two thin triangular plates, the orbital plates, which form the vaults of the orbits, and are separated from one another by a median gap, the ethmoidal notch. ... The zygomatic bone (malar bone) is a paired bone of the human skull. ... The maxillae are the largest bones of the face, except for the mandible, and form, by their union, the whole of the upper jaw. ... Figure 1 : Sphenoid bone, upper surface. ... Your skull is in your back (this is obviously not true, I was just testing the website to see if it really works) The ethmoid bone (os ethmoidale) is a bone in the skull that separates the nasal cavity from the brain. ... The palatine bone is a bone situated at the back part of the nasal cavity between the maxilla and the pterygoid process of the sphenoid. ... The orbital process of the palatine bone is placed on a higher level than the sphenoidal, and is directed upward and lateralward from the front of the vertical part, to which it is connected by a constricted neck. ... The lacrimal bone (Os Lacrimale), the smallest and most fragile bone of the face, is situated at the front part of the medial wall of the orbit . ...

Foramina and openings

1. Optic foramen
2. Superior orbital fissure
3. Inferior orbital fissure
4. Anterior ethmoid foramen
5. Posterior ethmoidal foramen
6. Infraorbital foramen
7. Supraorbital foramen
8. Naso-lacrimal canal opening
9. Zygomatic orbital foramen

The superior surface of the sphenoid bone is bounded behind by a ridge, which forms the anterior border of a narrow, transverse groove, the chiasmatic groove (optic groove), above and behind which lies the optic chiasma; the groove ends on either side in the optic foramen, which transmits the optic... 1 Foramen ethmoidale, 2 Canalis opticus, 3 Fissura orbitalis superior, 4 Fossa sacci lacrimalis, 5 Sulcus infraorbitalis, 6 Fissura orbitalis inferior, 7 Foramen infraorbitale The superior orbital fissure is a foramen in the skull, although strictly it is more of a cleft, lying between the lesser and greater wings of... The lateral wall and the floor of the orbit are separated posteriorly by the inferior orbital fissure which transmits the maxillary nerve and its zygomatic branch, the infraorbital vessels, and the ascending branches from the sphenopalatine ganglion. ... Above the canine fossa is the infraorbital foramen, the end of the infraorbital canal; it transmits the infraorbital vessels and nerve. ... Arching transversely below the superciliary arches is the upper part of the margin of the orbit, thin and prominent in its lateral two-thirds, rounded in its medial third, and presenting, at the junction of these two portions, the supraorbital notch or foramen for the supraorbital nerve and vessels. ...

Additional images

The skull from the front. Image File history File links Gray190. ...	Medial wall of left orbit. Image File history File links Gray192. ...	Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure. Image File history File links Gray787. ...	Coronal section of nasal cavities.
	Lateral orbit anatomy Image File history File links Orbita_mensch. ...	Lateral orbit nerves

External links

• eMedicine oph/2 - "Arterial Supply, Orbit"
• SUNY Labs 29:os-0501
• Atlas of anatomy at UMich eye_5
• Atlas of anatomy at UMich rsa2p4
• Interactive tutorial at anatome.ncl.ac.uk