Orbit (anatomy)

This article is about the anatomical space that contains the eye. For other uses, see Orbit (disambiguation) and Orbita (disambiguation).
Orbit
Diagram of eye with surrounding superior, oblique, medial and inferior rectus muscles; supraorbital foramen shown above the eye, and inferior orbital fissure inferolaterally.
Details
Identifiers
Latinorbita
MeSHD009915
TA98A02.1.00.067
A01.2.01.010
TA2469
FMA53074
Anatomical terminology

In anatomy, the orbit[a] is the cavity or socket/hole of the skull in which the eye and its appendages are situated. "Orbit" can refer to the bony socket,[1] or it can also be used to imply the contents.[2] In the adult human, the volume of the orbit is about 28 millilitres (0.99 imp fl oz; 0.95 US fl oz),[3] of which the eye occupies 6.5 ml (0.23 imp fl oz; 0.22 US fl oz).[4] The orbital contents comprise the eye, the orbital and retrobulbar fascia, extraocular muscles, cranial nerves II, III, IV, V, and VI, blood vessels, fat, the lacrimal gland with its sac and duct, the eyelids, medial and lateral palpebral ligaments, cheek ligaments, the suspensory ligament, septum, ciliary ganglion and short ciliary nerves.


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  1. ^ "Orbit – Definition and More from the Free Merriam-Webster Dictionary". Retrieved 2010-03-26.
  2. ^ Orbit at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
  3. ^ Lieger, Olivier; Schaub, Manuel; Taghizadeh, Elham; Büchler, Philippe (2019). "How Symmetrical Are Bony Orbits in Humans?". Maxillofac Surg. 77 (1): 118-125118-125. PMID 30243522.
  4. ^ Tasman, W.; Jaeger, E. A., eds. (2007). "Embryology and Anatomy of the Orbit and Lacrimal System". Duane's Ophthalmology. Lippincott Williams & Wilkins. ISBN 978-0-7817-6855-9.