- Pretectum
Infobox Brain
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Latin = area pretectalis
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BrainInfoType = hier
BrainInfoNumber = 450
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DorlandsPre = a_59
DorlandsSuf = 12151405Pretectum is a structure located in the
midbrain . It receives binocular input from theeye s and is involved with the pupillary light reflex. It is also known as the Pretectal Area.Outputs
The pretectum, after receiving binocular input, outputs to the
Edinger-Westphal nucleus in the midbrain,
* to theCilio-spinal nucleus (Budge), which is located in the VIII cervical and I, II thoracic vertebral segments,
* and to the nucleus of theposterior commissure .The Edinger-Westphal nucleus and Budge's Cilio-Spinal Nucleus project onto the
ciliary ganglion , whose output controls pupillary diameter (mydriasis ormyosis ).The Edinger-Westphal nucleus controls the
Pupillary sphincter muscle (used in situations of bright light to reduce the exposure of the retina) and theCiliary muscle (used for eye focusing and accommodation).The Cilio-Spinal Nucleus controls the
Pupillary dilator muscle (used in situations of dark light, to increase the exposure of the retina)ee also
*
Oculomotor nerve
*Mesencephalon
*List of regions in the human brain External links
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