What is the main function of the superior colliculus?
What is the main function of the superior colliculus?
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 passes through the superior colliculus?
The superior colliculus (SC) is a structure in the midbrain that is part of the brain circuit for the transformation of sensory input into movement output. Its major function is orienting the animal, particularly with eye movements, to objects of interest in the outside world.
What is the role of lateral geniculate nucleus?
The lateral geniculate nucleus (LGN) belongs to the category of sensory projection nuclei of the thalamus and plays an essential role in normal visual processing.
What are the functions of the M P and K layers of the LGN?
Retinal P ganglion cells send axons to a parvocellular layer, M ganglion cells send axons to a magnocellular layer, and K ganglion cells send axons to a koniocellular layer. Koniocellular cells are functionally and neurochemically distinct from M and P cells and provide a third channel to the visual cortex.
What is the lateral geniculate?
The lateral geniculate nucleus is a multilayered structure that receives input from both eyes to build a representation of the contralateral visual hemifield.
What is lateral geniculate nucleus made of?
The LGN consists of six eye-specific layers, four of which receive inputs from parvocellular retinal ganglion cells, and two of which receive magnocellular inputs. Each layer is organized into a precise retinotopic map.
What supplies the lateral geniculate nucleus?
The lateral geniculate body has a dual blood supply from the anterior choroidal artery (branch from internal carotid artery) and from the lateral choroidal artery (branch from the posterior cerebral artery).
What do the K cells process?
K cells contribute to brightness contrast information and colour contrast in species with colour vision. K cells contribute to eye movement-related signals by directly projecting to the dorsomedial visual area (DM, V6) which is a motion-related area.
What is LGB anatomy?
LGN and LGB are used interchangeably and serve the same function. Terminate in the lateral geniculate body (LGB) of the thalamus, or. Pass on to the midbrain in the brachium of the superior colliculus to terminate in thesuperior colliculus (tectal area) and in pretectal areas.
What is the difference between the superior and inferior colliculus?
The superior colliculus is connected with the lateral geniculate nucleus for reflex ( Fig. 4.45 ), while the inferior colliculus is connected with the medial geniculate nucleus for auditory pathway ( Fig. 3.52 ).
What is the connection between lateral geniculate nucleus and superior colliculus?
The connection between the lateral geniculate nucleus and superior colliculus is also for light reflex, because the connection includes the 2nd neuron of visual pathway ( Fig. 3.5) to the pretectal nucleus ( Fig. 3.18 ).
Is the superior colliculus evolutionarily conserved?
The superior colliculus is an evolutionarily conserved structure that receives direct retinal input (May, 2005). In mice, 85%–90% of retinal ganglion cells project to the superior colliculus (Ellis et al., 2016; Hofbauer and Dräger, 1985; Linden and Perry, 1983).
What is the function of the superior colliculus in rodents?
The superior colliculus in rodents have been hypothesized to mediate sensory-guided approach and avoidance behaviors . Recent studies employing circuit analysis tools on mouse superior colliculus have revealed several important functions.
