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The nictitating membrane of a masked lapwing as it closes over the left eye, originating from the medial canthus. The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision.
It is loose, thus eye movements are not restricted by it. Only one species of primate, the Calabar angwantibo, is known to have a functioning nictitating membrane. [4] With ocular allergies, the lacrimal caruncle and plica semilunaris may be inflamed and pruritic (itchy) due to histamine release in the tissue and tear film.
The Harderian gland is a gland found within the eye's orbit that occurs in tetrapods (reptiles, amphibians, birds and mammals) that possess a nictitating membrane. [1] The gland can be compound tubular or compound tubuloalveolar, and the fluid it secretes (mucous, serous or lipid) varies between different groups of animals.
Life is usually saved if the airway is opened via a hole in the throat. If a person survives, they may have symptoms, but usually will get better after the airway is reopened. If the symptoms are severe enough, treatment may be needed.
A tracheo-esophageal puncture (or tracheoesophageal puncture) is a surgically created hole between the trachea (windpipe) and the esophagus (food pipe) in a person who has had a total laryngectomy, a surgery where the larynx (voice box) is removed. The purpose of the puncture is to restore a person’s ability to speak after the vocal cords ...
Initially, these often result in coughing from swallowed contents of the oesophagus that are aspirated through the trachea, often progressing to fatal pneumonia; there is rarely a curative treatment. [13] A tracheo-oesophageal puncture is a surgically created hole between the trachea and the esophagus in a person who has had their larynx ...
A cobblestone throat occurs when inflamed bumps develop in the back of your throat. Infections, allergies, and acid reflux can all cause the bumps. Skip to main content. 24/7 Help. For premium ...
In squamate reptiles both the nictitating membrane and the eyelids have been suggested as the evolutionary origin of the brille, but embryonic studies supports the fusion of the dorsal and ventral eyelids. [1] Brille means "spectacles" or "glasses" in German, Norwegian, and Danish.