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Damage to this nerve typically manifests itself as mydriasis, because the sympathetic supply to the pupil, which causes mydriasis, remains unaffected, and therefore unopposed. Multiple central nervous system disorders e.g. epilepsy, stroke, and impending brain herniation are known to lead to temporal mydriasis as well. A brain catastrophe, or a ...
Miosis, or myosis (from Ancient Greek ... The opposite condition, mydriasis, is the dilation of the pupil. Anisocoria is the condition of one pupil being more dilated ...
Dilation and constriction of the pupil. Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve.. A constriction response (), [1] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates/opioids or anti-hypertension medications.
The signs and symptoms occur on the same side (ipsilateral) as it is a lesion of the sympathetic trunk. It is characterized by miosis (a constricted pupil), partial ptosis (a weak, droopy eyelid), apparent anhidrosis (decreased sweating), with apparent enophthalmos (inset eyeball). [2]
Sympathetic; Sensory Retina: The pupillary reflex pathway begins with the photosensitive retinal ganglion cells , which convey information via the optic nerve , the most peripheral, distal, portion of which is the optic disc .
Sympathetic (adrenergic) Parasympathetic (muscarinic) Pupil dilator muscle: α1: Dilates (causes mydriasis) Iris sphincter muscle-M3: contracts (causes miosis) Ciliary muscle: β2: relaxes (causes long-range focus) M3: contracts (causes short-range focus)
The sympathetic nervous system also has some preganglionic nerves terminating at the chromaffin cells in the ... miosis when M3 is stimulated or mydriasis otherwise.
Light from a single point of a distant object and light from a single point of a near object being brought to a focus. The accommodation reflex (or accommodation-convergence reflex) is a reflex action of the eye, in response to focusing on a near object, then looking at a distant object (and vice versa), comprising coordinated changes in vergence, lens shape (accommodation) and pupil size.