In
anatomy, the
orbit is the cavity or socket of the
skull in which the
eye and
its appendages are situated. "Orbit" can refer to the bony socket, or it can also be used to imply the contents. In the adult human, the volume of the orbit is 30 mL, of which the eye occupies 6.5 mL. 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 nasolacrimal duct, the eyelids,
medial and lateral palpebral ligaments, check ligaments, the
suspensory ligament,
septum,
ciliary ganglion and short ciliary nerves.
