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tegmentum

Line breaks: teg|men¦tum
Pronunciation: /tɛɡˈmɛntəm
 
/

Definition of tegmentum in English:

noun (plural tegmenta /-ə/)

Anatomy
A region of grey matter on either side of the cerebral aqueduct in the midbrain.
Example sentences
  • A thin, transversely oriented ribbon of fibers, the medial lemniscus, ascends from the lower brainstem into the midbrain tegmentum where it occupies a ventrolateral position.
  • Ascending from the medulla and curving dorsolaterally into the tegmentum of the midbrain is the medial lemniscus, on its way to the thalamus.
  • The lateral and medial lemnisci are gathered together in a large bundle that passes around the dorsolateral surface of the superior cerebellar peduncle to reach the midbrain tegmentum.

Origin

mid 19th century: from Latin, variant of tegumentum 'tegument'.

Derivatives

tegmental

1
adjective
Example sentences
  • These effects have been suggested to be involved in depression of the excitability of the vagal sensory axons and the dopaminergic neuron in the ventral tegmental area of the brain.
  • Activation of dopamine D 2 like receptors is known to inhibit the activity of dopaminergic neurons in the ventral tegmental area of the brain.
  • Changes that have been observed in association with chronic administration of opioids include physical atrophy of dopamine-producing neurons in the ventral tegmental area.

Definition of tegmentum in:

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