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Encyclopedia > Orbit (anatomy)
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. ... The sphenoid bone (from Greek sphenoeides, wedgelike) is a bone situated at the base of the skull in front of the temporals and basilar part of the occipital. ... 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. ... Human heart and lungs, from an older edition of Grays Anatomy. ... For other uses of Skull, see Skull (disambiguation). ... For other uses, see Eye (disambiguation). ... In medicine, Adnexa refers to the appendages of an organ. ...


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


In the adult human, the volume of the orbit is 30 ml, of which the eye occupies 6.5 ml. [1]

Contents

Contents

Fascia is specialized connective tissue layer which surrounds muscles, bones, and joints, providing support and protection and giving structure to the body. ... The term orbital has several meanings: In physics and chemistry it is used to describe an atomic electron configuration, see also molecular orbital and atomic orbital. ... The corticobulbar (or corticonuclear) tract is a white matter pathway connecting the cerebral cortex to the brainstem (the term bulbar referring to the brainstem). ... 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. ... This article is about the anatomical structure. ... 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). ... f you all The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... For other uses, see FAT. Fats consist of a wide group of compounds that are generally soluble in organic solvents and largely insoluble in water. ... The lacrimal glands are paired glands, one for each eye, that secrete the aqueous layer of the tear film. ...

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. ...

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 orbital process of the the zygomatic bone is a thick, strong plate, projecting backward and medialward from the orbital margin. ... The maxillae are the largest bones of the face, except for the mandible, and form, by their union, the whole of the upper jaw. ... The orbital surface is smooth and triangular, and forms the greater part of the floor of the orbit. ... The sphenoid bone (from Greek sphenoeides, wedgelike) is a bone situated at the base of the skull in front of the temporals and basilar part of the occipital. ... The greater wing of the sphenoid bone, or ali-sphenoid, is a bony process of the sphenoid bone; there is one on each side, extending from the side of the body of the sphenoid and curving upward, laterally, and backwards. ... The lesser wings of the sphenoid or orbito-sphenoids are two thin triangular plates, which arise from the upper and anterior parts of the body, and, projecting lateralward, end in sharp points [Fig. ... 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 lateral surface of the labyrinth of the ethmoid bone is formed of a thin, smooth, oblong plate, the lamina papyracea, which covers in the middle and posterior ethmoidal cells and forms a large part of the medial wall of the orbit; it articulates above with the orbital plate of... 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. ... Ethmoidal foramina can refer to: anterior ethmoidal foramen posterior ethmoidal foramen Category: ... Lateral to either olfactory groove are the internal openings of the anterior and posterior ethmoidal foramina (or canals). ... 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. ... The nasolacrimal duct carries tears from the lacrimal sac into the nasal cavity. ... On the orbital process of the zygomatic bone are seen the orifices of two canals, the zygomaticoörbital foramina; one of these canals opens into the temporal fossa, the other on the malar surface of the bone; the former transmits the zygomaticotemporal, the latter the zygomaticofacial nerve. ...

Additional images

References

  1. ^ Duane's Ophthalmology, Chapter 32 Embryology and Anatomy of the Orbit and Lacrimal System . (eds Tasman W, Jaeger EA) Lippincott/Williams & Wilkins, 2007

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