ptotic /toh"tik/, adj.
/toh"sis/, n. Pathol.
1. a drooping of the upper eyelid.
2. prolapse or drooping of any organ.
[1735-45; < NL < Gk ptósis a falling]

* * *

also called  blepharoptosis  
 drooping of the upper eyelid. The condition may be congenital or acquired and can cause significant obscuration of vision. In congenital ptosis the muscle that elevates the lid, called the levator palpebrae superioris, is usually absent or imperfectly developed. If severe and not corrected in a timely manner, congenital ptosis can lead to amblyopia and permanent vision loss. Congenital palsy of the third (oculomotor) cranial nerve (which normally stimulates elevation of the upper lid) is a more rare cause of congenital ptosis.

      Acquired ptosis has many potential causes, but it is usually due to age-related stretching or displacement of the fibres connecting the levator palpebrae superioris muscle to structures within the upper eyelid. It can also result from muscular diseases (such as muscular dystrophy or myasthenia gravis) or damage to the oculomotor nerve from diabetes (diabetes mellitus), hypertension, atherosclerosis, trauma, or direct compression. In a disorder called Horner syndrome, a slight ptosis occurs in association with a smaller pupil and decreased sweat production on the affected side.

      Treatment of persistent blepharoptosis is usually surgical. Depending on the circumstances surrounding the onset of the ptosis, testing may be required to investigate possible underlying causes.

Daniel M. Albert David M. Gamm

* * *

Universalium. 2010.

Игры ⚽ Поможем решить контрольную работу

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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”