Definition of tegmentum in English:

tegmentum

nounPlural tegmenta tɛɡˈmɛntəmˌteɡˈmen(t)əm

Anatomy

A region of grey matter on either side of the cerebral aqueduct in the midbrain.
Example sentencesExamples
- 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.
- 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.
- Ascending from the medulla and curving dorsolaterally into the tegmentum of the midbrain is the medial lemniscus, on its way to the thalamus.
- In the brainstem, the medial longitudinal fasciculus is a well-defined white bundle, descending through the midbrain tegmentum, adjacent to the central gray matter.
- The bulky superior cerebellar peduncles cross each other to form the decussation of the superior cerebellar peduncles, located within the midbrain tegmentum.

Derivatives

tegmental

adjective

Anatomy

Changes that have been observed in association with chronic administration of opioids include physical atrophy of dopamine-producing neurons in the ventral tegmental area.
Example sentencesExamples
- Activation of dopamine D 2 like receptors is known to inhibit the activity of dopaminergic neurons in the ventral tegmental area of the brain.
- This system, which originates in the ventral tegmental area of the brain stem can be selectively activated by stress.
- The medial longitudinal fasciculus retains its paramedian position, and the central tegmental tract is surrounded by the loose substance of the reticular formation, situated dorsal to the medial lemniscus.
- 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.

Origin

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

Definition of tegmentum in US English:

tegmentum

nounˌteɡˈmen(t)əm

Anatomy

A region of gray matter on either side of the cerebral aqueduct in the midbrain.
Example sentencesExamples
- 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.
- Ascending from the medulla and curving dorsolaterally into the tegmentum of the midbrain is the medial lemniscus, on its way to the thalamus.
- In the brainstem, the medial longitudinal fasciculus is a well-defined white bundle, descending through the midbrain tegmentum, adjacent to the central gray matter.
- The bulky superior cerebellar peduncles cross each other to form the decussation of the superior cerebellar peduncles, located within the midbrain tegmentum.
- 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.

Origin

Mid 19th century: from Latin, variant of tegumentum ‘tegument’.

单词	tegmentum
释义	Definition of tegmentum in English: tegmentum nounPlural tegmenta tɛɡˈmɛntəmˌteɡˈmen(t)əm Anatomy A region of grey matter on either side of the cerebral aqueduct in the midbrain. Example sentencesExamples 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. 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. Ascending from the medulla and curving dorsolaterally into the tegmentum of the midbrain is the medial lemniscus, on its way to the thalamus. In the brainstem, the medial longitudinal fasciculus is a well-defined white bundle, descending through the midbrain tegmentum, adjacent to the central gray matter. The bulky superior cerebellar peduncles cross each other to form the decussation of the superior cerebellar peduncles, located within the midbrain tegmentum. Derivatives tegmental adjective Anatomy Changes that have been observed in association with chronic administration of opioids include physical atrophy of dopamine-producing neurons in the ventral tegmental area. Example sentencesExamples Activation of dopamine D 2 like receptors is known to inhibit the activity of dopaminergic neurons in the ventral tegmental area of the brain. This system, which originates in the ventral tegmental area of the brain stem can be selectively activated by stress. The medial longitudinal fasciculus retains its paramedian position, and the central tegmental tract is surrounded by the loose substance of the reticular formation, situated dorsal to the medial lemniscus. 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. Origin Mid 19th century: from Latin, variant of tegumentum 'tegument'. Definition of tegmentum in US English: tegmentum nounˌteɡˈmen(t)əm Anatomy A region of gray matter on either side of the cerebral aqueduct in the midbrain. Example sentencesExamples 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. Ascending from the medulla and curving dorsolaterally into the tegmentum of the midbrain is the medial lemniscus, on its way to the thalamus. In the brainstem, the medial longitudinal fasciculus is a well-defined white bundle, descending through the midbrain tegmentum, adjacent to the central gray matter. The bulky superior cerebellar peduncles cross each other to form the decussation of the superior cerebellar peduncles, located within the midbrain tegmentum. 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. Origin Mid 19th century: from Latin, variant of tegumentum ‘tegument’.
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