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Rostrally the midbrain adjoins the diencephalon (thalamus, hypothalamus, etc.), while caudally it adjoins the hindbrain (pons, medulla and cerebellum). [5] In the rostral direction, the midbrain noticeably splays laterally. The midbrain is typically sectioned axially at either the superior or inferior colliculi levels.
Section of mid-brain at level of superior colliculi. Hind- and mid-brains; postero-lateral view. Superior colliculus labeled in blue. The superior colliculus is a paired structure of the dorsal midbrain and is part of the midbrain tectum. The two superior colliculi are situated inferior/caudal to the pineal gland and the splenium of corpus ...
The midbrain tegmentum is situated anteriorly to the cerebral aqueduct. [3] The portion of the tegmentum posterior to the aqueduct is the tectum . [ 1 ] The superior and inferior colliculi that make up the corpora quadrigemina are situated posteriorly to it.
Anatomically, as the name suggests, the MLR is located in the mesencephalon (or midbrain), ventral to the inferior colliculus and near the cuneiform nucleus. [6] Although identifying the exact anatomical substrates of the MLR has been subject to considerable debate, the pedunculopontine nucleus (PPN), cuneiform nucleus, and midbrain ...
Cross-section of the midbrain. Tectum. Corpora quadrigemina. Inferior colliculi; Superior colliculi; Pretectum; Tegmentum. Periaqueductal gray; Rostral interstitial nucleus of medial longitudinal fasciculus; Midbrain reticular formation; Dorsal raphe nucleus; Red nucleus; Ventral tegmental area. Parabrachial pigmented nucleus; Paranigral ...
The inferior colliculi of the midbrain are located just below the visual processing centers known as the superior colliculi. The inferior colliculus has three subdivisions – the central nucleus, the dorsal cortex by which it is surrounded, and an external cortex which is located laterally. [1]
The general structures of midbrain tegmentum include red nucleus and the periaqueductal grey matter. Nigrostriatal Pathway and Mesolimbic Pathway in the Dopaminergic System. Unlike the midbrain tectum (which is a sensory structure located posteriorly), the midbrain tegmentum, which locates anteriorly, is related to a number of motor functions.
In neuroanatomy, 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, the optokinetic reflex, and temporary changes to the ...