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298548246-Anatomy-of-Eye.docx - Anatomy and Physiology of...

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Anatomy and Physiologyof EyeAnterior view of the lacrimal apparatusSagital section of eye and its accessory structures
Accessory Structure of the EyeThe Accessory structures of the eye include theeyelids,eyelashes,eyebrows,the lacrimal(tear-producing) apparatus, andextrinsic eye muscle.1.EyelidsThe upper and lower eyelids, or palpebrae,shade the eyes during sleep, protect theeyes from excessive light and foreign objects, and spread lubricating secretion over theeyeballs. The upper eyelid ismore moveablethan the lower and contains in its superiorregion thelevator palpebrae superioris muscle. Sometimes a person may experience anannoying twitch in eyelid, it often associated with stress and fatigue.The space between the upper and lower eyelids that exposes the eyeball is thepalpebral fissure. Its angle are known as thelateral commissurewhich is narrower andcloser to the temporal bone, and themedial commissure, which is broader and nearerthe nasal bone. In the medial commissure is a small, reddish elevation, the lacrimal

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