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The brachium of superior colliculus (or superior brachium) is a branch that extends laterally from the superior colliculus, and, passing to the thalamus between the pulvinar and the medial geniculate nuclei, is partly continued into an eminence called the lateral geniculate nucleus, and partly into the optic tract.
English: Diagram of the superior colliculus of the human midbrain (shown in dark red) and surrounding regions. The superior colliculus is surrounded by a red ring and transparent red circle to indicate its location.
The superior colliculus is positioned above the inferior colliculus, and marks the rostral midbrain. It is involved in the special sense of vision and sends its superior brachium to the lateral geniculate body of the diencephalon. The tegmentum which forms the floor of the midbrain, is ventral to the cerebral aqueduct.
Superior olivary complex. Medial superior olive; Lateral superior olive; Medial nucleus of the trapezoid body; Paramedian pontine reticular formation; Parvocellular reticular nucleus; Caudal pontine reticular nucleus; Cerebellar peduncles. Superior cerebellar peduncle; Middle cerebellar peduncle; Inferior cerebellar peduncle
It arises from the superior colliculus of the mesencephalic (midbrain) tectum, and projects to the cervical and upper thoracic spinal cord levels. [2] It mediates reflex turning of the head and upper trunk in the direction of startling sensory stimuli (visual, auditory, or skin). [2] It arises from the deep layers of the superior colliculus.
In the brain, the corpora quadrigemina (Latin for "quadruplet bodies") are the four colliculi—two inferior, two superior—located on the tectum of the dorsal aspect of the midbrain. They are respectively named the inferior and superior colliculus. The corpora quadrigemina are reflex centers involving vision and hearing.
The optic tract is a continuation of the optic nerve that relays information from the optic chiasm to the ipsilateral lateral geniculate nucleus (LGN), pretectal nuclei, and superior colliculus. [14] The optic tract represents the first stage in the visual pathway in which visual information is transferred in a homonymous nature. [15]
Diagram of the midbrain, sectioned at the level of the superior colliculus (Central tegmental tract not labeled, but region is visible.) Axial section of the Brainstem (Pons) at the level of the Facial Colliculus (Central tegmental tract not labeled, but region is visible.)