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Which Midbrain Structures Mediate Visual Reflexes?
Which Midbrain Structures Mediate Visual Reflexes?
Sarah Jenkins••7 min read
The superior colliculus
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.
is a raised area of the dorsal surface of the midbrain involved in visual reflexes and attention. Surrounding the aqueduct is a thick layer of neurons called the periaqueductal gray
periaqueductal gray
The periaqueductal gray (PAG, also known as the central gray) is a brain region that plays a critical role in autonomic function, motivated behavior and behavioural responses to threatening stimuli. PAG is also the primary control center for descending pain modulation.
. Below the periaqueductal gray is a prominent pair of motor nuclei called the oculomotor nuclei
oculomotor nuclei
The oculomotor nucleus is found at the level of the superior colliculus. It contains the somatic efferent fibers that control the medial rectus, inferior rectus, superior rectus, inferior oblique, and the striated muscle in the levator palpebrae superioris. The oculomotor nucleus is split up into multiple subnuclei.
The superior colliculus is a raised area of the dorsal surface of the midbrain involved in visual reflexes and attention. Surrounding the aqueduct is a thick layer of neurons called the periaqueductal gray. Below the periaqueductal gray is a prominent pair of motor nuclei called the oculomotor nuclei.
What part of the brain is responsible for visual reflexes?
tectum: The dorsal part of the midbrain, responsible for auditory and visual reflexes.
Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.
