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The cerebral peduncles (In Latin, ped-means 'foot'.) are the two stalks that attach the cerebrum to the brainstem. [1] They are structures at the front of the midbrain which arise from the ventral pons and contain the large ascending (sensory) and descending (motor) tracts that run to and from the cerebrum from the pons.
The middle cerebellar peduncle is the largest of the three cerebellar peduncles. It connects the pons and cerebellum.It consists almost entirely of fibers passing from the pons to the cerebellum (fibrocerebellar fibers); the fibers arise from the pontine nuclei and decussate within the pons before entering the peduncle [1] to end in the contralateral cerebellar hemisphere.
The efferent pathways include the cerebellorubral, dentatothalamic, and fastigioreticular tracts. All of them emerge from the deep cerebellar nuclei; the cerebellorubral fibers from the globose nucleus and emboliform nucleus, the dentatothalamic fibers from the dentate nucleus, and the fastigioreticular fibers from the fastigial nucleus.
The superior cerebellar peduncle connects to the midbrain. It consists mainly of efferent fibers , the cerebellothalamic tract that runs from a cerebellar hemisphere to the contralateral thalamus , and the cerebellorubral tract that runs from a cerebellar hemisphere to the red nucleus .
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). [5] In the rostral direction, the midbrain noticeably splays laterally.
The inferior cerebellar peduncle is formed by fibers of the restiform body that join with fibers from the much smaller juxtarestiform body. [1] The inferior cerebellar peduncle is the smallest of the three cerebellar peduncles.
Part of supraoptic nucleus; Other nuclei of preoptic area. Median preoptic nucleus; Periventricular preoptic nucleus; Tuberal Medial area Dorsomedial hypothalamic nucleus; Ventromedial nucleus; Arcuate nucleus; Lateral area Tuberal part of Lateral nucleus; Lateral tuberal nuclei; Posterior Medial area Mammillary nuclei (part of mammillary ...
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 ...