Home | | Human Nervous System and Sensory Organs | Medial Nuclear Group - Dorsal Thalamus

Medial Nuclear Group - Dorsal Thalamus - | Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail |

Chapter: Human Nervous System and Sensory Organs - Diencephalon

Medial Nuclear Group - Dorsal Thalamus

The medial nuclear group (medial complex) (B5) consists of a medial magnocellular nucleus, a lateral parvocellular nucleus, and a caudal nucleus.

Medial Nuclear Group

The medial nuclear group (medial complex) (B5) consists of a medial magnocellular nucleus, a lateral parvocellular nucleus, and a caudal nucleus. All nuclei project to the frontal lobe, namely, to thepremotor cortex,the polar cortex, and the orbital cortex (B6). Afferent fiber bundles run via the inferior thalamic radiation from the globus pallidusn(B7) and from the basal  nucleus  of  Meynert(substantia innominata) to the medial nuclear group. The medial magno-cellular nucleus has fiber connections to the hypothalamus (B8) (preoptic area and tuber cinereum) and to the amygdaloid body (amygdala). The lateral parvocellular nu-cleus receives fibers from the adjacent ven-tral nuclei of the thalamus.

The medial nuclear complex is thought to receive visceral and somatic impulses via pathways from the hypothalamus and ven-tral nuclei; the impulses are integrated here and then transmitted via the anterior thalamic radiation to the frontal cortex. The basic affective mood, which is essentially de-termined by unconscious stimuli from the visceral and somatic spheres, is thought to enter consciousness in this way.


Clinical Note: It has been observed in patientswith severe agitation that incision of the thalamocortical tracts (prefrontal lobotomy) had a calming effect but was also associated with in-difference and a regression of personality. The stereotactic destruction of the medial nuclear complex has similar effects.


Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail


Copyright © 2018-2021 BrainKart.com; All Rights Reserved. (BS) Developed by Therithal info, Chennai.