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Pithy part of a plant
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medulla
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Population (2000): 6637 Housing Units (2000): 2739 Land area (2000): 5.675822 sq. miles (14.700312 sq. km) Water area (2000): 0.017590 sq. miles (0.045557 sq. km) Total area (2000): 5.693412 sq. miles (14.745869 sq. km) FIPS code: 43925 Located within: ...
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WordNet
Word definitions in WordNet
n. a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers [syn: myelin , myeline ] lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata); "the medulla ...
Usage examples of medulla.
The ganglia situated over the esophagus of insects correspond to the medulla oblongata in man, in which originate the spinal accessory, glosso-pharyngeal, and pneumogastric nerves.
In this regional division we include the medulla, the posterior and middle portions of which give rise to the pneumogastric nerve.
The medulla is absent in the downy hairs, but in the coarser class it is always present, especially in white hair.
By some authors this crossing of the sensory and motor filaments has been supposed to take place near the medulla oblongata.
The medulla oblongata is traversed by a longitudinal fissure, continuous with that of the spinal cord.
By some physiologists these bodies are considered as the nuclei, or vital points, of the medulla oblongata.
The functions of the medulla oblongata, which begin with the earliest manifestations of life, are of an instinctive character.
Those of the spinal cord and medulla oblongata are performed without any consciousness or sensation on the part of the subject.
In the posterior chamber of the skull is the cerebellum, anterior to, and below which, is the medulla oblongata, connecting with the spinal cord and sympathetic system.
Its cerebral area includes the posterior and inferior portions of the cerebrum, the entire cerebellum, and that part of the medulla which connects with the spinal cord, all of which sustain intimate relations to vital conditions.
We have treated the brain, not as a mass of organs radiating from the medulla oblongata as their real center, but as two cerebral masses, each of which is developed around the great ventricle.
This condition extended through both the larger and the smaller brain, cerebrum, and cerebellum, but was not so marked in the medulla, or commencing portion of the spinal cord, as in the other portions.
The uppermost connects it with the midbrain, the next with the pons, and the lowermost with the medulla oblongata.
For instance, the rate of salivary secretion is controlled by certain cells in the upper medulla and the lower pons.
It arises from the pons a little before its junction with the medulla and leads to the external rectus muscle of the eyeball.