brainstem (redirected from brainstems)

brainstem (brān´stem″) the stemlike portion of the brain connecting the cerebral hemispheres with the spinal cord, and comprising the pons, medulla oblongata, and midbrain; considered by some to include the diencephalon.

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brainstem or brain stem (brnstm)

n.

The portion of the brain, consisting of the medulla oblongata, pons Varolii, and mesencephalon, that connects the spinal cord to the forebrain and cerebrum.

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Brainstem

Brain structure closest to the spinal cord, involved in controlling vital functions, movement, sensation, and nerves supplying the head and neck.

Mentioned in: Progressive Supranuclear Palsy

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brainstem

Etymology: AS, bragen + stemm

the portion of the brain comprising the medulla oblongata, the pons, and the mesencephalon. It performs motor, sensory, and reflex functions and contains the corticospinal and reticulospinal tracts. The 12 pairs of cranial nerves from the brain arise mostly from the brainstem. Compare medulla oblongata, mesencephalon, pons.

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brainstem,

n the portion of the brain comprising the medulla oblongata, pons, and mesencephalon. It performs motor, sensory, and reflex functions.

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brainstem

the stemlike portion of the brain connecting the cerebral hemispheres with the spinal cord, and comprising the pons, medulla oblongata and midbrain; considered by some to include the diencephalon. See also reticular activating system, ascending reticular formation, thalamus.

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brainstem auditory evoked response

see brainstem auditory evoked response.

brainstem hemorrhage

results from cranial trauma and characteristically causes unconsciousness with varying types and degrees of motor paralysis and irregularities of respiration, depending on the site.

brainstem reticular formation

see reticular activating system.