Mammillary body

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Template:Short description Template:Infobox brain The mammillary bodies also mamillary bodies, are a pair of small round brainstem nuclei.<ref name="Petersen">Template:Cite web</ref> They are located on the undersurface of the brain that, as part of the diencephalon, form part of the limbic system. They are located at the ends of the anterior arches of the fornix.<ref>Template:Cite web</ref> They consist of two groups of nuclei, the medial mammillary nuclei and the lateral mammillary nuclei.<ref>Template:Cite journalTemplate:Dead link.</ref>

Neuroanatomists have often categorized the mammillary bodies as part of the posterior part of hypothalamus.<ref>M.B. Carpenter and J. Sutin: Human Neuroanatomy (8th edition) 1983</ref>

Structure

Connections

They are connected to other parts of the brain (as shown in the schematic, below left), and act as a relay for impulses coming from the amygdalae and hippocampi, via the mamillothalamic tract to the thalamus.

The lateral mammillary nucleus has bidirectional connections with the dorsal tegmental nucleus. The medial mammillary nucleus connects with the ventral tegmental nucleus.<ref name="Peterson">Template:Cite web</ref>

Function

Mammillary bodies, and their projections to the anterior thalamus via the mammillothalamic tract, are important for recollective memory.<ref name = Vann2009>Template:Cite journal</ref> According to studies of rats with mammillary body lesions, damage to the medial mammillary nucleus lead to spatial memory deficits.<ref name = Vann2009/>

Clinical significance

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. Lesions of the medial dorsal and anterior nuclei of the thalami and lesions of the mammillary bodies are commonly involved in amnesic syndromes in humans.<ref>Template:Cite journal</ref>

Mammillary body atrophy is present in several other conditions, such as colloid cysts in the third ventricle, Alzheimer's disease, schizophrenia, heart failure, and sleep apnea. In spite of this the exact function of the mammillary bodies is still not clear.<ref name = Vann2009/>

See also

References

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