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CONTRACTION PUPIL [1 record]

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Record 1 2017-07-12

English

Subject field(s)
  • The Eye
CONT

Pupil contraction is caused by excitation of the circular pupillary constriction muscle innervated by the parasympathetic fibers.

CONT

Optic nerve atrophy is characterized by a decrease in visual acuity, a lessening of pupillary contraction, and pallor in the optical disc.

Key term(s)
  • contraction of the pupil

French

Domaine(s)
  • Oeil
CONT

La contraction et la dilation de l'iris sont contrôlées par deux muscles antagonistes : le muscle sphincter pupillaire et le muscle [dilatateur] de la pupille. Ainsi, quand on parle de «pupille dilatée», il s'agit en fait d'une dilatation de l'iris due à un relâchement du muscle sphincter et une contraction du muscle dilatateur. Réciproquement, la contraction de la pupille est causée par une contraction du muscle sphincter.

Spanish

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