What is the function of the colliculi?
2.31. 1 Abstract. The superior colliculus (SC) is a multisensory midbrain structure that integrates visual, auditory, and somatosensory spatial information to initiate orienting movements of the eyes and head toward salient objects in space.
What is the function of the superior and inferior colliculi?
The superior colliculus is a layered, multi-sensory structure. Its upper layer receives visual signals from the retina of the eye, while the lower layers process multiple signals from various other parts of the brain.
Where are the colliculi located?
midbrain
There are two superior colliculi in the midbrain. They are symmetrically positioned, one on either side of the midline of the brainstem; they form two bumps on the posterior external surface of the brainstem. The superior colliculi are just below the thalamus and above the two inferior colliculi.
What are the 3 parts of the midbrain?
The principal regions of the midbrain are the tectum, the cerebral aqueduct, tegmentum, and the cerebral peduncles. Rostrally the midbrain adjoins the diencephalon (thalamus, hypothalamus, etc.), while caudally it adjoins the hindbrain (pons, medulla and cerebellum).
Which is the superior colliculus of the midbrain?
Superior colliculus. The superior colliculus refers to the rostral (front) bump on the lateral (side) part of the midbrain. It is, in fact, a pair of two colliculi, superior and inferior, on either side of the midbrain that together constitute the tectum.
Where are the superior and inferior colliculi located?
The two superior colliculi sit below the thalamus and surround the pineal gland in the vertebrate midbrain. It comprises the dorsal aspect of the midbrain, posterior to the periaqueductal gray and immediately superior to the inferior colliculus.
What are the two transverse sections of the midbrain?
Two transverse sections of the midbrain will be discussed: the level of the inferior colliculus, and the level of the superior colliculus. The anteriolateral surface of the midbrain houses the paired crus cerebri.
Where are the colliculi and peduncles located in the brain?
Inferior quadrigeminal brachium conveys fibres from the lateral lemniscus and inferior colliculus to the medial geniculate body. Inferior to the colliculi, the trochlear nerve (CN IV) emerges before sweeping across to the anterior surface. The paired cerebral peduncles extend from the cerebral hemispheres to converge as they meet the pons.
