The word "palpebra" is a Latin term that refers to the eyelid. The spelling of this word, /pælˈpiːbrə/ in IPA phonetic transcription, can be broken down into two syllables: "pal" and "pebra". The "p" is pronounced with a slight aspiration, while the "l" sound is made by touching the tip of the tongue to the roof of the mouth. The "e" and "a" create a long "a" sound, and the "br" consonant blend is pronounced quickly with a rolling "r".
The term "palpebra" refers to a specific anatomical structure found in humans and many animals. It is more commonly known as the eyelid. The palpebra is a thin, movable flap of skin that covers and protects the eye. It plays a crucial role in maintaining the health and functionality of the eye.
The palpebra is comprised of several layers, including skin, muscle, and connective tissue. It is attached to the orbital rim through a flexible hinge-like joint called the palpebral fissure. This joint allows the eyelid to open and close, enabling important functions such as blinking, which helps to distribute tear fluid across the ocular surface and protect the eye from foreign particles.
Along the margin of the palpebra, there are small hair follicles and sebaceous glands that produce oils to keep the eyelid and lashes lubricated and protected. The eyelid also houses various specialized structures, including eyelashes, meibomian glands, and lacrimal glands.
In addition to its protective functions, the palpebra also contributes to vision by controlling the amount of light that enters the eye. Acting in coordination with the iris and pupil, the eyelid can regulate the exposure of the eye to light, thus preventing excessive brightness or glare.
Overall, the palpebra is a vital and intricate structure that plays a significant role in maintaining ocular health, protecting the eye, and facilitating clear vision.
The eyelid.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "palpebra" comes from the Latin term palpebra, which means "eyelid". It is derived from the verb palpare, meaning "to touch softly" or "to stroke lightly". The term palpebra was used in Latin to refer to the movable skin folds that cover and protect the eyes. Over time, the term was adopted into English and other languages to describe the anatomical structure of the eyelid.