The Peculiarities of Human Body

creating a thesis and an outline on The Peculiarities of Human Body. Prepare this assignment according to the guidelines found in the APA Style Guide. An abstract is required. Lens- present behind the iris, supported by the zonula (fine fibrils). It changes shape to focus light on the retina with the help of ciliary muscles. It becomes thick when it focuses on nearby objects while it becomes thinner when it focuses on distant objects.Choroid- it is the vascular coat of the eye and provides nutrition to the retina at its inner side. The ciliary body is present on the anterior side and contains smooth ciliary muscles, contraction of these muscles adjusts the diameter of the lens and enables the eye to focus on the objects. Aqueous humor (AH) (transparent) is secreted by the ciliary epithelium it maintains ocular pressure. Ciliary muscles provide attachment to the irisIridocorneal angle contains meshwork of cells, it contains Schlemm’s canal which carries out AH from the anterior chamber into the venous system, the process is called aqueous drainage. The anterior chamber is between the cornea (anterior) and lens and iris (posterior), from the posterior part of the lens up to retina, translucent fluid is present and this is vitreous humor (VH).The eye is present in the bony part- orbit and at its posterior apes is the optic canal containing optic nerve which takes the signals of vision to the brain. Blood vessels and cranial nerves enter the eye through an opening called orbital fissures. Lachrymal glands are present on the anterior side in the super-lateral facet, a fossa is present on the anterior medial wall for lachrymal sac, secretions of lachrymal glands prevent the eyes from drying.Retina- is the most important layer on which an inverted image is formed by the lens of the eye. It contains rods (which have rhodopsin and are responsible for night vision), and cones (which are responsible for colored vision). Image falling on the black spot cannot be seen but the image is sharpest at the yellow spot which is present on the optic nerve and sends the message to the brain.Optic nerve- originates from the eye and is surrounded by dura mater, arachnoid mater, and the pia mater which continues up to the brain.Eye rotation. The primary muscles of the eye that are responsible for movement in all direction are agonist, synergist is the same muscles that move the eye in the same direction as an agonist, while the antagonist moves the eye in the opposite direction (Segre & Bagi, n.d.). The eye is the sense organ for sight, light enters through cornea, enters pupil, and adjusted by the lens to form an image on the retina.

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