Is the Edinger-Westphal nucleus in the superior colliculus?
By Mia Lopez
Is the Edinger-Westphal nucleus in the superior colliculus?
4.3. 1 The Edinger–Westphal nucleus. EW is a distinct nucleus of the midbrain, lying immediately dorsal to the oculomotor complex. It is located just slightly ventral and lateral to the cerebral aqueduct at the level of the superior colliculus (Figure 1).
Where can the Edinger-Westphal nucleus be found?
The EWpg is what is thought of as the classic ONC—sending parasympathetic nerve fibers towards the eye. It is located in the midbrain immediately dorsal to the oculomotor nucleus near the level of the superior colliculus, which is why it is often included in the overarching term oculomotor complex.
What does the Edinger-Westphal nucleus control?
Function. The Edinger–Westphal nucleus supplies preganglionic parasympathetic fibers to the eye, constricting the pupil, accommodating the lens, and convergence of the eyes. It has also been implicated in the mirroring of pupil size in sad facial expressions.
What is accessory oculomotor nucleus?
The accessory oculomotor nucleus is the site of origin of the preganglionic nerve fibers that enter the orbit with the oculomotor nerve. This nucleus is located both rostral and dorsal to the oculomotor nucleus. Its nerve fibers run into and travel along with the superior aspect of the ipsilateral oculomotor nerve.
How many Edinger Westphal nucleus do we have?
two nuclei
The Edinger-Westphal nucleus is a small parasympathetic motor nucleus in the midbrain and one of the two nuclei for the oculomotor nerve.
What is Pretectal nucleus?
The olivary pretectal nucleus is a primary visual centre sensitive to luminance changes. It is involved in the pupillary light reflex, the consensual pupillary light reflex and related reflexes, such as the lid closure reflex whereby pupillary constriction takes place.
What does the pretectum do?
The pupillary light reflex is mediated by the pretectum. This reflex is responsible for the constriction of the pupils upon light’s entering the eye. Several pretectal nuclei, in particular the ON, receive illuminance information from the ipsilateral retina via the optic tract.
What does the pulvinar nucleus do?
The pulvinar nucleus of the thalamus, for example, is involved in filtering or suppressing irrelevant stimuli in a cluttered display. However, the cortical region that plays the most significant role in the control of spatial attention is the posterior parietal region.
