ANATOMY, EYE
Anatomic model of the human right eye (three-quarter view). The eye, lying on the orbital fat (in yellow), is enclosed in the orbit. This cavity is delimited mainly by the frontal (orbital apex and side wall), sphenoid (behind), zygomatic (medial wall, towards the nasal crest) bones and the maxilla (roof and lateral wall of the orbit). The eyeball is composed of an outer fibrous coat, consisting of the sclera (a white opaque tunic) and, in front, the cornea, a transparent membrane allowing to focus the image. Under the cornea, the colored iris includes several muscles controling the opening of the pupil (in black). A window is here opened sideways through the three layers of the eyeball (external tunic, uvea and retina) in order to show the blood vascularization. Six extraocular muscles (in red) govern the eye movements. In the vertical plane, the inferior and superior rectus muscles lowers and raises the look, respectively. Horizontally situated, the lateral (on the left of the picture) and medial rectus muscles turn the look outwards and inwards, respectively. The superior oblique muscle performs the eye rotation downwards and outwards ; it ends by a tendon (in white) that goes across a ring shaped like a pulley, the trochlea, and then is attached to the posterolateral side of the eyeball. The inferior oblique muscle, lying on the orbital roof, is not well visible here; it turns the eye upwards and outwards. These various muscles are posteriorly bound together to a tendinous ring, the common annular tendon (bluish), which also receives the optic nerve (in white) transmitting the visual data to the brain. The lacrimal sac (in orange) is a bulge of the nasolacrimal duct draining the tears.
Size: 3630px × 2942px
Photo credit: © GOUNOT/3B SCIENTIFIC / BSIP / Alamy / Afripics
License: Licensed
Model Released: No
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