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Fovea centralis

/ˈfōvēə/ Noun, pl. foveae Also generally known as fovea. 1. A part of the eye, located in the center of the macula region of the retina. The fovea is responsible for sharp central vision (also called foveal vision), which is necessary in humans for reading, driving, and any activity where visual detail is of primary importance. (wikipedia.org) 2. A tiny spot located in the macula that is the area of clearest vision on the retina. (biology-online.org) 3. Area consisting of a small depression in the retina containing cones and where vision is most acute. (wordnetweb.princeton.edu) Word origin: From Latin fovea (“ditch,...

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Foveola

Noun, pl. foveolas or foveolae or foveolæ (Anatomy) 1. The center of the fovea in the macula of the eye, approximately 0.35 mm in diameter, containing only cone cells. (wiktionary.org) 2. A yellowish, cone photo receptor filled portion of the human retina located within a region called the macula. The foveola is approximately 0.35 mm in diameter and lies in the center of the fovea and contains only cone cells, and a cone-shaped zone of Müller cells. (wikipedia.org) Word origin: Latin word meaning a little pit (diminutive of Latin...

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Frenulum

/ˈfrenyələm/ Noun, pl. fraenulums, frenulums 1. A small fold of tissue that secures or restricts the motion of a mobile organ in the body. (wikipedia.org) 2. A small fold or ridge of tissue that supports or checks the motion of the part to which it is attached, in particular a fold of skin beneath the tongue, or between the lip and the gum. (Google Dictionary) 3. (In some moths and butterflies) A bristle or row of bristles on the edge of the hind wing that keeps it in contact with the forewing. (Google Dictionary) Syn: Frenum, pl. frena Word origin: Latin frēnulum, “little bridle”, the diminutive of...

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