Ptosis
Downward displacement. Ptosis of the eyelids is drooping of the eyelids.
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1. A sinking down or prolapse of an organ. 2. SYN: blepharoptosis. [G. p., a falling]
- p. adiposa SYN: blepharochalasis.
- aponeurogenic p. drooping of the eyelid caused by dehiscence of the tendon of the levator muscle.
- p. sympathetica SYN: Horner syndrome.

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pto·sis 'tō-səs n, pl pto·ses -.sēz a sagging or prolapse of an organ or part <renal \ptosis> esp a drooping of the upper eyelid (as from paralysis of the oculomotor nerve)

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n.
drooping of the upper eyelid, for which there are several causes. It may be due to a disorder of the third cranial nerve (oculomotor nerve), in which case it is likely to be accompanied by paralysis of eye movements causing double vision and an enlarged pupil. When part of Horner's syndrome, ptosis is accompanied by a small pupil and an absence of sweating on that side of the face. It may be due to myasthenia gravis, in which the ptosis increases with fatigue and is part of a more widespread fatiguable weakness. Ptosis is associated with the severe pain and other symptoms of a cluster headache. It may also occur as an isolated congenital feature or as part of a disease of the eye muscles, when it is associated with weak or absent eye movements.

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pto·sis (toґsis) [Gr. ptōsis fall] 1. prolapse. 2. drooping of the upper eyelid; called also blepharoptosis.

Bilateral ptosis.


Medical dictionary. 2011.

Look at other dictionaries:

  • Ptosis — Saltar a navegación, búsqueda Ptosis: (del griego πτωσις, caída ). Sinónimo:Blefaroptosis. Desprendimiento del párpado superior. Es total o parcial, según que evite o no la visión. Este síntoma puede ser provocado por un daño palpebral (Se usa… …   Wikipedia Español

  • Ptosis — des paupières Classification et ressources externes Ptosis de la paupière droite chez un homme atteint d une myasthénie. La paupière du côté gauche a une rétraction compensatrice (Loi de Hering sur l état d innervati …   Wikipédia en Français

  • Ptôsis — Ptosis Ptosis des paupières Classification et ressources externes CIM 10 H02.4 CIM 9 374.3 Le ptosis, ou ptôse palpébrale ou encore blépharoptose, est la chute de la paupière supérieure (uni ou bilatérale), résultant d un déficit du muscle… …   Wikipédia en Français

  • ptosis — [ ptozis ] n. m. • 1904; du gr. ptôsis « chute » → ptose ♦ Méd. Abaissement permanent de la paupière supérieure. Ptosis congénital. Ptosis paralytique, par paralysie du muscle releveur de la paupière. ● ptôsis nom masculin (grec ptôsis, chute)… …   Encyclopédie Universelle

  • ptosis — f. anat. patol. Caída o prolapso de un órgano, una víscera o una parte, debido, a menudo, a una relajación de los medios de sujeción, como en la ptosis renal, palpebral, gástrica, etcétera. Medical Dictionary. 2011. ptosis …   Diccionario médico

  • Ptosis — (from the Greek word πτῶσις falling, a fall ) refers to droopiness of a body part. Specifically, it can refer to: Ptosis (eyelid) (the most common usage of the term) Ptosis (breasts) Enteroptosis (intestine) Gastroptosis (stomach) Nephroptosis or …   Wikipedia

  • ptosis — 1743, from Gk. ptosis, lit. falling, fall …   Etymology dictionary

  • ptosis — [tō′sis] n. [ModL < Gr ptōsis, a fall, falling < piptein: see FEATHER] a prolapse, or falling of some organ or part; esp., the drooping of the upper eyelid, caused by the paralysis of its muscle ptotic [tō′tik] adj …   English World dictionary

  • Ptosis — Pto sis, n. [NL., fr. Gr. ? a falling.] (Med.) Drooping of the upper eyelid, produced by paralysis of its levator muscle. [1913 Webster] …   The Collaborative International Dictionary of English

  • Ptosis — (griech.), das Herabsinken des obern Augenlides zusammen mit der Unfähigkeit, es genügend zu heben, ist die Folge einer Lähmung des Augenlidhebers, entweder bedingt durch Bildungsfehler des Augenlides oder durch Erkrankungen des die Lidhebung… …   Meyers Großes Konversations-Lexikon

  • ptosis — (Del gr. πτῶσις, caída). f. Med. Caída o prolapso de un órgano o parte de él …   Diccionario de la lengua española

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