[DOC] [TLE] Pupil - Wikipedia [PAR] The pupil is a hole located in the centre of the iris of the eye that allows light to 
strike the retina. ... When bright light is shone on the eye, light sensitive cells in 
the retina, including rod and cone photoreceptors and ... The sphincter muscle 
has a parasympathetic innervation, and the dilator has a sympathetic innervation. [DOC] [TLE] Iris dilator muscle - Wikipedia [PAR] The iris dilator muscle is a smooth muscle of the eye, running radially in the iris 
and therefore fit ... with "Radiating fibers" labeled near center, which are part of 
the ciliary muscle.) ... When stimulated, the cells contract, widening the pupil and 
allowing for more light to ... Iris sphincter muscle  Mydriasis  Pupillary response... [DOC] [TLE] Coats of the Eye - Iris [PAR] Towards the front of the eye, the muscles of the iris (colored portion of the eye) 
control the amount of light ... In bright light, the sphincter muscle contracts while 
the dilator muscle relaxes, closing down the pupil and making the aperture 
smaller. [DOC] [TLE] The Iris - TedMontgomery.com [PAR] When too much light is entering the eye, the iris sphincter muscle (which 
encircles the pupil) ... This causes the dilator and sphincter iris muscles 
controlling the pupil to have to work ... Other structures, posterior to the iris, also 
are part of the uveal tract. ... In addition, the pupil may become smaller in the eye 
affected by iritis. [DOC] [TLE] Commonly Used Dilating Drops (mydriatic medications) - PGCFA ... [PAR] Mar 8, 2008 ... The eye doctor can then see the optic nerve and retina as well as the whole lens. 
... the muscle that makes the pupil smaller (iris sphincter muscle) or by ... If a 
cataract is small, enlarging the pupil can allow the patient to see ... help the eye 
to stay well formed and recover when the eye pressure gets too low. [DOC] [TLE] The Eye's Physical Mechanism [PAR] Its path to the retina is controlled by an apparatus of physical parts that fits ... The 
pupil is made smaller through the action of the pupillary sphincter muscle 
attached ... When the dilator muscle contracts, the diameter of the pupil can 
enlarge up... [DOC] [TLE] Free Flashcards about ANATOMY - StudyStack [PAR] THE DILATOR MUSCLE ENLARGES THIS PART OF THE EYE WHILE THE 
SPHINCTER MUSCLE MAKES IT SMALLER, PUPIL. IN A SINGLE RED BLOOD
... [DOC] [TLE] The Meaning of Pupil Dilation | The Scientist Magazine [PAR] Dec 6, 2012 ... And they do this without knowing exactly why our eyes behave this way. ... While 
the visual cortex in the back of the brain assembles the images we ... of muscle: 
in a brightly lit environment, a ring of sphincter muscles that .... Could cat pupil 
enlargement make sense for just the noise reduction part, even if... [DOC] [TLE] Iris sphincter muscle - ScienceDirect Topics [PAR] Cardiac, Skeletal, and Smooth Muscle Regulation by Ghrelin .... rupture or 
enlargement of such aneurysms typically produces an acute, ... to infarct the 
center part of the nerve, sparing the pupil occurs in approximately .... In the iris 
sphincter, it is independent of the GHSR1a, while in the dilator it is dependent of 
that receptor. [DOC] [TLE] Foundation Volume 2, Chapter 9. The Iris and the Pupil [PAR] The posterior iris leaf contains the dilator muscle, the sphincter muscle, and the 
posterior ... In the ciliary portion, the anterior stroma was intact (note the shallow 
... the anterior iris layers when the pupil is small becomes thinner when it 
enlarges. ... blocks the adrenergic input to the eye, and thus makes the pupil 
smaller. [DOC] [TLE] Dilator muscle of pupil - Medical Dictionary - The Free Dictionary [PAR] Related to dilator muscle of pupil: ciliary muscle, dilator pupillae muscle, ... 
Others, the abductors, make possible movement away from the midline of the ... 
sphincter muscle a ringlike muscle that closes a natural orifice; called also 
sphincter. .... of the orbital part of the orbicular muscle of eye that are inserted in 
the eyebrow,... [DOC] [TLE] The Anatomy of the Eye |

Question: The dilator muscle enlarges this part of the eye while the sphincter muscle makes it smaller
Answer: the pupil