enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Iris (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Iris_(anatomy)

    The iris consists of two layers: the front pigmented fibrovascular layer known as a stroma and, behind the stroma, pigmented epithelial cells.. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds.

  3. Stroma of iris - Wikipedia

    en.wikipedia.org/wiki/Stroma_of_iris

    Some circle the circumference of the iris and the majority radiate toward the pupil. Blood vessels and nerves intersperse this mesh. In dark eyes, the stroma often contains pigment granules. Blue eyes and the eyes of albinos, however, lack pigment. Structure of the iris and surrounding parts showing the stroma of iris (stroma iridis).

  4. Anterior segment of eyeball - Wikipedia

    en.wikipedia.org/wiki/Anterior_segment_of_eyeball

    The anterior segment or anterior cavity [1] is the front third of the eye that includes the structures in front of the vitreous humour: the cornea, iris, ciliary body, and lens. [2] [3] Within the anterior segment are two fluid-filled spaces: the anterior chamber between the posterior surface of the cornea (i.e. the corneal endothelium) and the ...

  5. Human eye - Wikipedia

    en.wikipedia.org/wiki/Human_eye

    An area termed the limbus connects the cornea and sclera. The iris is the pigmented circular structure concentrically surrounding the centre of the eye, the pupil, which appears to be black. The size of the pupil, which controls the amount of light entering the eye, is adjusted by the iris' dilator and sphincter muscles.

  6. List of medical roots, suffixes and prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_medical_roots...

    of or pertaining to the iris: Latin īrīs, rainbow; from Greek ἶρις (îris), rainbow iridectomy: isch-restriction Greek ἴσχω (ískhō), hold back, restrain ischemia: ischio-of or pertaining to the ischium, the hip-joint Greek ἰσχίον (iskhíon), hip-joint, ischium ischioanal fossa-ine: of or pertaining to

  7. Pupil - Wikipedia

    en.wikipedia.org/wiki/Pupil

    Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil. This is known as the pupillary light reflex. The iris contains two groups of smooth muscles; a circular group called the sphincter pupillae, and a radial group called the dilator pupillae. When the sphincter pupillae contract ...

  8. Uvea - Wikipedia

    en.wikipedia.org/wiki/Uvea

    The uvea (/ ˈ j uː v i ə /; [1] derived from Latin: uva meaning "grape"), also called the uveal layer, uveal coat, uveal tract, vascular tunic or vascular layer, is the pigmented middle layer of the three concentric layers that make up an eye, precisely between the inner retina and the outer fibrous layer composed of the sclera and cornea.

  9. Ciliary body - Wikipedia

    en.wikipedia.org/wiki/Ciliary_body

    This double membrane is often considered continuous with the retina and a rudiment of the embryological correspondent to the retina. The inner layer is unpigmented until it reaches the iris, where it takes on pigment. The retina ends at the ora serrata. The space between the ciliary body and the base of the iris is the ciliary sulcus. [4]