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The mammillotegmental fasciculus (mammillotegmental tract, or mammillotegmental bundle of Gudden) is a small bundle of efferent fibers from the hypothalamus running from the mammillary body to the tegmentum. [1]
Axons divide within the gray matter; the thicker fibres form the MTT while the finer branches descend as the mammillotegmental fasciculus. [3] The MTT spreads fan-like as it terminates in the medial dorsal nucleus. [3] The axons from these nuclei form part of the thalamocortical radiations. [6]
Damage to the mammillary bodies due to thiamine deficiency is implied in pathogenesis of Wernicke–Korsakoff syndrome.Symptoms include impaired memory, also called anterograde amnesia, suggesting that the mammillary bodies may be important for memory.
The fields of Forel is a complex region in the posterior subthalamus, consisting of a concentrated collection of bundles of fibers. [1] The tracts formed include the thalamic fasciculus that includes the ansa lenticularis and lenticular fasciculus, cerebellothalamic tracts, and pallidothalamic tracts.
It is located anterior and lateral to the medial longitudinal fasciculus. [citation needed] It is continuous caudally with the nucleus prepositus hypoglossi. [4] The PPRF (and adjacent regions of the pons) are traversed by fibers projecting to the abducens nucleus that mediate smooth pursuit, vestibular reflexes, and gaze holding. [5]: 498
The two nuclei receive the impulse from the two ascending tracts: fasciculus gracilis and fasciculus cuneatus. After the two tracts terminate upon these nuclei, the heavily myelinated fibres arise and ascend anteromedially around the periaqueductal gray as internal arcuate fibres. These fibres decussate (cross) to the contralateral (opposite ...
Ascending fibers are second-order axons projecting from the gustatory nucleus (the rostral part of the solitary nucleus] to the ventral posteromedial nucleus of thalamus [1] [3] (third-order neurons in turn project to the gustatory cortex).
The gracile nucleus and gracile fasciculus carry epicritic, kinesthetic, and conscious proprioceptive information from the lower part of the body (below the level of T6 in the spinal cord). Because of the large population of neurons in the gracile nucleus they give rise to a raised area called the gracile tubercle on the posterior side of the ...