The Edinger-Westphal nucleus is a small parasympathetic motor nucleus in the midbrain and one of the two nuclei for the oculomotor nerve. It is one of the cranial nerve nuclei.
What does Pretectal mean?
Medical Definition of pretectal : occurring in or being the transitional zone of the brain stem between the midbrain and the diencephalon that is situated rostral to the superior colliculus and is associated especially with the analysis and distribution of light impulses.
What is the tectum of the midbrain?
Anatomically, the tectum is that portion of the mesencephalon, or midbrain, sitting between the hindbrain and the forebrain. The name is the Latin word for roof and reflects the view of early anatomists that the tectum formed a roof over the fluid-filled cerebral aqueduct and the tegmentum.
Where is Abducens nucleus?
rhombomere 5
The abducens nucleus is a motor nucleus situated in rhombomere 5. It supplies the lateral rectus muscle of the eye. The main part of the nucleus is located ventral to the genu of the facial nerve, immediately lateral to the medial longitudinal fasciculus (Fig. 16.5).
Where is the superior colliculus located?
posterior midbrain
The superior colliculus is on the posterior midbrain, rostral to the inferior colliculus, and caudal to the pineal gland. It has seven internal cell layers, divided into superficial, intermediate, and deep layers. The superficial layers consist of stratum zonale, stratum griseum superficiale, and stratum opticum.
What is in the pretectum?
The pretectum constitutes a collection of nuclei of the rostrodorsal brainstem lying just in front of the superior colliculus at the transition between midbrain and diencephalon.
What nuclei are in the midbrain?
Notable midbrain nuclei include the superior and inferior colliculus nuclei, red nucleus, substantia nigra, oculomotor nuclear complex, and trochlear nucleus.
What is tectum made of?
TECTUM® panels are highly durable panels made of Aspen wood fibers held together with a cementitious binder.
What are the 3 functions of the midbrain?
midbrain, also called mesencephalon, region of the developing vertebrate brain that is composed of the tectum and tegmentum. The midbrain serves important functions in motor movement, particularly movements of the eye, and in auditory and visual processing.
What is the function of the olivary nucleus?
The olivary nucleus is central to the pupillary light reflex and receives an input predominantly from small melanopsin containing retinal ganglion cells (Young and Lund, 1998; Hattar et al., 2002 ).
Where do the pretectal nuclei project to?
All pretectal nuclei, except for the ON, project to nuclei in the thalamus, subthalamus, superior colliculus, reticular formation, pons, and inferior olive. Both the ON and the CPA have efferent projections to the Edinger-Westphal nucleus.
What does the anterior pretectal nucleus do?
In addition to the pretectum’s role in the visual system, the anterior pretectal nucleus has been found to mediate somatosensory and nociceptive information. The pretectum is a bilateral group of highly interconnected nuclei located near the junction of the midbrain and forebrain.
What is the function of the pupillary pretectal area?
Pretectal area. The pretectal area, or pretectum, is a midbrain structure composed of seven nuclei and comprises part of the subcortical visual system. Through reciprocal bilateral projections from the retina, it is involved primarily in mediating behavioral responses to acute changes in ambient light such as the pupillary light reflex,…
