Gracile nucleus

Gracile nucleus
Brain: Gracile nucleus
Gray688.png
Section of the medulla oblongata at the level of the decussation of the Pyramids. Gracile nucleus is #8.
Gray691.png
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
NeuroLex ID birnlex_2643

Located in the medulla oblongata, the gracile nucleus is one of the dorsal column nuclei that participate in the sensation of fine touch and proprioception of the lower body (legs and trunk). 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.

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.

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 principal sensory nucleus of trigeminal nerve).

Additional images

  • Decussation of pyramids.

  • Dissection of brain-stem. Lateral view.

  • Deep dissection of brain-stem. Lateral view.

  • Superior terminations of the posterior fasciculi of the medulla spinalis.

  • Section of the medulla oblongata at about the middle of the olive.

  • Diagram showing the course of the arcuate fibers.

  • The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.

  • Scheme showing the course of the fibers of the lemniscus; medial lemniscus in blue, lateral in red.

  • Transverse section passing through the sensory decussation.

  • Deep dissection of cortex and brain-stem.

  • The sensory tract.

External links

v · d · eHuman brain: rhombencephalon, myelencephalon: medulla (TA A14.1.04, GA 9.767)
Dorsal
Surface
Grey: other
White: Sensory/ascending
White: Motor/descending
Ventral
White: Motor/descending
Surface
Anterior median fissure · Anterolateral sulcus · Olive · Pyramid
Grey: Raphe/
reticular

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)
v · d · eBrain and spinal cord: neural tracts and fasciculi
Sensory/
ascending
Fast/lateral
Slow/medial
1° (Group C nerve fiber → Spinoreticular tract → Reticular formation) → 2° (MD of Thalamus) → 3° (Cingulate cortex)
Motor/
descending
Pyramidal
Cerebellar
Afferent
Efferent
Bidirectional:
Spinocerebellar
Unc. prop.

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)

M: PNS

anat(h/r/t/c/b/l/s/a)/phys(r)/devp/prot/nttr/nttm/ntrp

noco/auto/cong/tumr, sysi/epon, injr

proc, drug(N1B)

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