NICTITATING SPASM Meaning and
Definition
-
A nictitating spasm refers to an involuntary and rapid twitching or contraction of the nictitating membrane, also known as the third eyelid. It is a thin, translucent fold of tissue located in the inner corner of the eye, medial to the upper and lower eyelids. This membrane is present in many animals, including birds, reptiles, and mammals, and serves various functions such as protection, moistening the cornea, and aiding in clear vision.
Often, a nictitating spasm occurs spontaneously, without any external provocation or specific trigger. It is usually characterized by a quick, momentary movement of the nictitating membrane across the eyeball, which the affected individual may or may not be aware of. Nictitating spasms can occur in one or both eyes and may be intermittent or persistent, with varying frequency and duration.
While the exact causes of nictitating spasms remain unknown, they are commonly associated with irritation or inflammation of the eye, nervous system disorders, stress, fatigue, or certain medications. In some cases, nictitating spasms can be symptomatic of an underlying medical condition or neurological disorder that requires further evaluation and treatment.
Although nictitating spasms are typically harmless and self-limiting, they can, at times, interfere with vision or cause discomfort. If persistent, severe, accompanied by other concerning symptoms, or affecting daily activities, it is advisable to consult with a healthcare professional or an ophthalmologist for proper diagnosis, identification of potential underlying causes, and appropriate management or treatment options.
-
• A form of tic marked by repeated winking, a spasm of the orbicularis palpebrarum muscle.
• Winking s., involuntary spasmodic winking.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for NICTITATING SPASM
Etymology of NICTITATING SPASM
The etymology of the word "nictitating spasm" can be understood by breaking it down into its individual components:
1. Nictitating: The term "nictitating" comes from the Latin word "nictitare", which means "to wink or blink". It is derived from "nictus", meaning "a closing or shutting". In the context of the word "nictitating spasm", it refers to the sudden involuntary contraction or twitching of a muscle related to blinking.
2. Spasm: The term "spasm" originates from the Greek word "spasmos", meaning "convulsion". It refers to a sudden, abnormal, and involuntary contraction of muscles.
Therefore, the term "nictitating spasm" refers to the involuntary twitching or spasm of the muscles responsible for blinking.
