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Encyclopedia > Gracile nucleus
Brain: Gracile nucleus
Section of the medulla oblongata at the level of the decussation of the pyramids. Gracile nucleus is #8.
Dissection of brain-stem. Dorsal view. ("nucleus gracilis" is labeled on left, second from the bottom.)
Latin nucleus gracilis
Gray's subject #187 774
NeuroNames hier-763
Dorlands/Elsevier n_11/12581325

Located in the medulla oblongata, the gracile nucleus is one of the dorsal column nuclei that participates in the sensation of fine touch and proprioception. It contains second-order neurons of the dorsal column-medial lemniscus system which receive inputs from sensory neurons of the dorsal root ganglia and send axons that synapse in the thalamus. Image File history File links Gray688. ... The medulla oblongata is the lower portion of the brainstem. ... This is about the polyhedron. ... Image File history File links Gray691. ... Mostly enveloped by the cerebrum and cerebellum (blue), the visible part of brainstem is shown in black. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... NeuroNames is a system of nomenclature for the brain and related structures. ... Elseviers logo Elsevier, the worlds largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. ... The medulla oblongata is the lower portion of the brainstem. ... In the spinal cord, the dorsal column nuclei are the cuneate and gracile nuclei present at the junction between the spinal cord and the medulla oblongata. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Proprioception (from Latin proprius, meaning ones own and perception) is the sense of the position of parts of the body, relative to other neighbouring parts of the body. ... Drawing by Santiago Ramón y Cajal of neurons in the pigeon cerebellum. ... The posterior column-medial lemniscus pathway is the sensory pathway responsible for transmitting fine touch and conscious proprioceptive information from the body to the cerebral cortex. ... The mechanism of the reflex arc Sensory neurons (or neurones) are nerve cells within the nervous system responsible for converting external stimuli from the organisms environment into internal [[electrical poop is responsible for it aright underlie motor reflex loops and several forms of involuntary behavior, including pain avoidance. ... This is a dorsal root ganglion (DRG) from a chicken embryo (around stage of day 7) after incubation overnight in NGF growth medium stained with anti-neurofilament antibody. ... An axon, or nerve fiber, is a long slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neurons cell body or soma. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

The neurons contained within the nucleus form a visible bump called the gracile tubercle on the posterior side of the closed medulla at the floor of the fourth ventricle. Drawing by Santiago Ramón y Cajal of neurons in the pigeon cerebellum. ... In neuroanatomy, a nucleus is a central nervous system structure that is composed mainly of gray matter, and which acts as a hub or transit point for electrical signals in a single neural subsystem. ... The fourth ventricle is one of the four connected fluid-filled cavities within the human brain. ...

The gracile nucleus and fasciculus carry epicritic, kinesthetic, and conscious proprioceptive information from the lower part of the body (below the level of T6 in the spinal cord). The counterpart to the gracile nucleus and fasciculus is the cuneate nucleus and fasciculus, which carries the same type of information, but from the upper body (above T6, excepting the face and ear - the information from the face and ear is carried by the primary sensory trigeminal nucleus).

  Results from FactBites:
IX. Neurology. 4b. The Mid-brain or Mesencephalon. Gray, Henry. 1918. Anatomy of the Human Body. (3293 words)
Bechterew is of the opinion that the fibers from the motor area of the cerebral cortex form synapses with cells whose axons pass to the motor nucleus of the trigeminal nerve and serve for the coördination of the muscles of mastication.
The principal gray masses of the tegmentum are the red nucleus and the interpeduncular ganglion; of its fibers the chief longitudinal tracts are the superior peduncle, the medial longitudinal fasciculus, and the lemniscus.
The nucleus of the trigeminal nerve extends along the entire length of the aqueduct, and occupies the lateral part of the gray stratum, while the nuclei of the oculomotor and trochlear nerves are situated in its ventral part.
  More results at FactBites »



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