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HyperBrain syllabus Chapter 5 The dorsal column axons (#6691) synapse in the dorsal column nuclei, also known as the gracile and cuneate nuclei. On the dorsal surface of the medulla, on either side of midline, are protuberances known as the gracile tubercles (#5274) and cuneate tubercles (#5275). In the medulla, the medial lemniscus is a column of axons ventral to the hypoglossal nucleus and dorsal to the pyramid. www-medlib.med.utah.edu /kw/hyperbrain/syllabus/syllabus5.html   (1991 words)

Gray, Henry. 1918. Anatomy of the Human Body. Page 853   (Site not responding. Last check: 2007-10-26) The cerebellar reflex are is supposed to be completed by the fibers of the superior peduncle which pass from the cerebellum to the red nucleus of the mid-brain where some of their terminals and collaterals form synapses with neurons whose axons descend to the spinal cord in the rubrospinal fasciculus. They are probably in or near the dorsal nucleus of the same and the opposite side; various other locations are given, the dorsal column, the intermediate zone of the gray matter and the central portion of the anterior column. The fibers which come from the opposite gray columns cross some in the white and some in the gray commissure and pass with fibers from the same side through the lateral funiculus to the marginal region ventral to the dorsal spinocerebellar fasciculus. www.bartleby.com /107/pages/page853.html   (622 words)

Somatosensory I It is an area of large cells found lateral to the dorsal columns and in the ventral corner of the dorsal horn. dorsal columns (dorsal funiculi), containing the gracile and cuneate fasciculi lateral funiculi; lateral funiculi, containing dorsal and ventral spinocerebellar tracts; and the spinothalamic tract. The secondary fibers from the dorsal column nuclei cross to the contralateral side and ascend to the thalamusas the medial lemniscus. thalamus.wustl.edu /Neural_Systems_03/sys_web_2003/2003/20030226Lab.htm   (2845 words)

Chapter 6 - Somesthesia - Central Mechanisms In the dorsal column nuclei, the arrangement found in the dorsal columns is preserved, with lower limbs represented medially and upper limbs laterally. The dorsal column fibers are branches of the large myelinated fibers of the medial division of the dorsal root. Dorsal column fibers are spatially distant from spinothalamic tract fibers, but fibers in other tracts may well be cut with a spinothalamic tractotomy. www.unmc.edu /Physiology/Mann/mann6.html   (11611 words)

Interactive Fly, Drosophila Intermediate neuroblast defective labels all intermediate column neuroectoderm and neuroblasts, whereas Huckebein labels the intermediate neuroectoderm and neuroblasts of row 3 (e.g., NB 4-2) and the ventral and intermediate neuroectoderm of rows 1 and 5. In embryos carrying the hsp70-vnd transgene that are heat shocked to induce ubiquitous vnd expression (hs-vnd embryos), ventral markers are ectopically expressed in the intermediate and dorsal columns of the neuroectoderm and neuroblasts, and intermediate and dorsal markers are lost. In hs-vnd embryos, the row 1 ventral column marker Huckebein is ectopically detected in the dorsal neuroectoderm, and the dorsal column marker Msh is partially repressed. www.sdbonline.org /fly/neural/vnd.htm   (2520 words)

[No title] The dermatomes of each dorsal root succeed each other rostro-caudally in an orderly fashion, including arms and legs, in a sequential pattern which is particularly obvious if the body is viewed in the basic quadrupedal posture, with the thumbs pointing forwards, and the face raised to look straight ahead. The ascending collaterals enter the ipsilateral dorsal white column, where, axons entering at any spinal level, are overlaid laterally to the axons ascending from lower levels. corticospinal and raphespinal tracts) is transmitted into the dorsal column nuclei and to the dorsal horn of the spinal grey matter, to allow active regulation of the sensory input pathways. www.mona.uwi.edu /fpas/courses/physiology/neurophysiology/DorsalColumnSystem.htm   (1332 words)

SCI Terms The word dorsal is usually applied to quadriped (four-legged) animals whereas the word “posterior” is usually used for human. Thus, the dorsal horn refers to the gray matter in the spinal cord that is close to the back (posterior) side of the cord. The dorsal spinal root is associated with a dorsal root ganglion which contains the cell bodies of the sensory neurons that send axons into the peripheral nerve and into the spinal cord. www.msouza.net /terms.htm   (4477 words)

Dorsoventral patterning in the Drosophila central nervous system: the vnd homeobox gene specifies ventral column ... the neuronal progeny of the ventral column neuroblasts. in the intermediate and dorsal columns of the neuroectoderm and in a subset of the neuronal progeny of ventral column neuroblasts www.genesdev.org /cgi/content/full/12/22/3603   (6095 words)

Pain Deep or visceral pain is not highly localized because of the absence of numerous mechanoreceptors in the deeper structures, and its normally perceived as a diffuse pain. Dorsal column-medial lemniscal system neurons are involved in what is called the gate-control theory of pain control. The frequency of action potentials that are transmitted in the dorsal column-medial lemniscal system is increased when the skin is rubbed vigorously and when the limbs are moved and may explain why vigorously rubbing a large area around a source of pricking pain tends to reduce the intensity of the painful sensation. www.mhhe.com /biosci/ap/holehaap/student/olc2/n-reading10.html   (1222 words)

Nervous System   (Site not responding. Last check: 2007-10-26) is between the dorsal column and the dorsal median sulcus. The dorsal median sulcus and ventral median fissure are becoming prominent. The dorsal and ventral nerves of each body segment join outside the vertebral column (thus establishing a single spinal nerve per segment on each side of the body. www.uta.edu /biology/restricted/3452nerv.htm   (2739 words)

Gray, Henry. 1918. Anatomy of the Human Body. Page 850   (Site not responding. Last check: 2007-10-26) The sympathetic efferent fibers, probably arise from cells in the lateral column or the base of the anterior column and emerge through the anterior roots and white rami communicantes. These are preganglionic fibers which end in various sympathetic ganglia from which postganglionic fibers conduct the motor impulses to the smooth muscles of the viscera and vessels and secretory impulses to the glands. It is very unlikely that either the terminals or collaterals of the dorsal root fibers effect simple direct connections with the motor cells of the ventral column, there is at least one if not several intercalated neurons in the path. www.bartleby.com /107/pages/page850.html   (428 words)

Dorsoventral patterning in the Drosophila central nervous system: the intermediate neuroblasts defective homeobox gene ... in the dorsal columns and in the adjacent intermediate columns column neuroblasts, and for the repression of ventral- and dorsal-specific Threshold responses to the dorsal regulatory gradient and the subdivision of primary tissue territories in the Drosophila embryo. www.genesdev.org /cgi/content/full/12/22/3591   (6737 words)

Sensorimotor Integration at the Dorsal Column Nuclei -- Mariño et al. 14 (6): 231 -- Physiology Primary afferents running in the dorsal column and corticofugal fibers running in the pyramidal tract are segregated in this part of the nucleus. Corticospinal neurons with branching axons to the dorsal column nuclei in the monkey. Pyramidal tract and corticospinal neurons with branching axons to the dorsal column nuclei of the cat. physiologyonline.physiology.org /cgi/content/full/14/6/231   (2966 words)

Journal of Biology | Full text | Astrocytes derived from glial-restricted precursors promote spinal cord repair Previous studies have shown that about 30–40% of ascending dorsal column axons projecting to the dorsal column nuclei arise from postsynaptic dorsal column neurons in spinal laminar 4 and that 25% of ascending dorsal column axons are also propriospinal in origin [43,44]. For dorsal column injuries (Figure 1a–c), the right-side dorsal column was unilaterally transected between cervical vertebrae 1 and 2 using a 30-gauge needle as a blade (see also [4,11,62]). In the dorsal column lesion model, ascending endogenous axons were traced by BDA injection to a depth of 0.5 mm into the right-side cuneate and gracile white matter at the C3/C4 spinal level (Figure 1c). jbiol.com /content/5/3/7   (7585 words)

Posterior column-medial lemniscus pathway - Wikipedia, the free encyclopedia The name comes from the two structures that the sensation travels up: the posterior (or dorsal) columns of the spinal cord, and the medial lemniscus in the brainstem. Because the posterior columns are also called dorsal columns, the pathway is often called the dorsal column-medial lemniscus system, or DCML for short. For example, in the columns, lower limb is medial, upper limb is more lateral. en.wikipedia.org /wiki/Posterior_column-medial_lemniscus_pathway   (557 words)

Dorsal Column Stimulation   (Site not responding. Last check: 2007-10-26) Contraindications to dorsal column stimulation for intractable angina are presented in an appendix to the Background section of this CPB. Dorsal column stimulators (DCS), also known as spinal cord stimulators, are most commonly used for the management of failed back surgery syndrome. Dorsal column stimulators have also been shown to be effective in the treatment of patients with angina pectoris patients who fail to respond to standard pharmacotherapies and are not candidates for surgical interventions. www.aetna.com /cpb/data/CPBA0194.html   (4010 words)

Multichannel apparatus for epidural spinal cord stimulation - Patent 5643330 A fiber model for the dorsal column fibers was based upon D.R. McNeal's "Analysis of a model for excitation of myelinated nerve", IEEE Transactions Biom. For the dorsal root fibers a cable model with a curved trajectory was used, the proximal end being connected to a dorsal column fiber model. The shape of the recruited area of dorsal column fibers does not differ significantly when mono-, bi-, tri-, or quadripolar stimulation with a conventional longitudinal SCS electrode array is given, as was shown by Holsheimer et al. www.freepatentsonline.com /5643330.html   (7629 words)

Control of Size and Excitability of Mechanosensory Receptive Fields in Dorsal Column Nuclei by Homolateral Dorsal Horn ...   (Site not responding. Last check: 2007-10-26) column nuclei and in the ipsilateral spinal cord. cell was isolated in the dorsal column nuclei, and its receptive This influence of dorsal horn neurons on the relay of mechanosensory jn.physiology.org /cgi/content/abstract/80/1/120   (515 words)

Lesson 5: Lecture 2 Transcript Each of these are going to correspond with different aspects of the body; the dorsal being to the back, ventral being to the front, and lateral being to the side. In contrast, the dorsal horn is larger where sensory nerves from the limbs are entering the spinal cord. The dorsal column is going to lie between the two dorsal horns. www.class.uidaho.edu /psyc372/lessons/lesson05/transcript_5-2.htm   (1336 words)

SC 1. Dorsal Column System - Intro   (Site not responding. Last check: 2007-10-26) The spinal cord is comprised of an outer zone of white matter and a butterfly-shaped central component of cells and fibers (grey [or gray] matter). Cells in dorsal root ganglia (DRG) possess two processes, one that passes peripherally to pick up information from a sensory receptor and one that passes centrally into the spinal cord. In the case of the dorsal column system, these axons are called alpha-beta fibers. www.neuroanatomy.wisc.edu /sc97/text/p1/intro.htm   (259 words)

[No title] Upon entering the spinal cord these neurons enter the dorsal white matter on the same side of the cord and travel up to brainstem levels (unlike the spinothalamic tracts which synapse in the cord and cross over the midline of the central nervous system). Rather, the fasciculus cuneatus is found laterally located within the dorsal column at this point and receives all discriminative sensa-tions to be carried to the cerebral cortex. Collectively, they are also referred to as the posterior or dorsal columns, and the lemniscal pathways as they travel via the medial lemniscus within the brainstem region. www.uwm.edu /~tking/king3_8.htm   (413 words)

Interactive Fly, Drosophila At this stage each column is about five cells wide and runs from the procephalic region to the most posterior region of the embryo. In Drosophila the DV patterning genes subdivide the trunk neuroectoderm into longitudinal columns; vnd is required for the specification of the ventral neuroectodermal column and NBs; ind and msh have analogous functions in the intermediate and dorsal neuroectodermal columns and NBs, respectively. In contrast to vnd and ind, the initial pattern of Dichaete in Egfr mutant embryos is greatly reduced in the intermediate column and moderately reduced in the medial column during early neurogenesis. www.sdbonline.org /fly/hjmuller/intndf4.htm   (6285 words)

Transplanted Olfactory Ensheathing Cells Remyelinate and Enhance Axonal Conduction in the Demyelinated Dorsal Columns ... Areas A, B, and C indicate the dorsomedial, centromedial, and ventromedial regions of the dorsal column, respectively; within these areas the sizes (cross-sectional area) of myelinated axons were measured for one representative video field every millimeter along the length of the spinal cord segment that was studied. In normal dorsal columns the amplitude of the CAP decreased with increasing conduction distance. axon regions in the dorsal columns is reminiscent of peripheral www.jneurosci.org /cgi/content/full/18/16/6176   (5528 words)

Axon Regeneration In the vivo experiments, the researchers used the dorsal columns of rats to study the regeneration of CNS axons. The dorsal root ganglia that was injected with saline, had very little growth of the injured axons into the regions of the lesions. The dorsal root ganglia that was injected with db-cAMP, had growth of the injured axons. www.unr.nevada.edu /~chan2   (984 words)

SC 1. Dorsal Column System - Pathway As the central process of the alpha-beta axon approaches the spinal cord it travels in what is called the medial division of the dorsal root (this medial group of fibers will be contrasted with other central processes that lie laterally in the dorsal root). There are two components to the dorsal column system, called fasciculus gracilis and fasciculus cuneatus (fasciculus = L., little bundle; gracilis = slender; cuneatus = wedge). In the fasciculus cuneatus, the most medially placed fiber arises from dorsal root T6 and the most lateral arises from dorsal root C2 (remember from Gross Anatomy that C1 is purely motor, and therefore does not have a dorsal root ganglion?!!). www.neuroanatomy.wisc.edu /sc97/text/p1/Pathway.htm   (470 words)

Dorsal Column Stimulator - Spinal Cord Stimulator FAQs The following Frequently Asked Questions and the answers are for the Dorsal Column Stimulator. Dorsal Column Spinal Cord Stimulator is a specialized device, which stimulates nerves by tiny electrical impulses via small electrical wires placed on the spinal cord. Currently at TPM, Dorsal Column Spinal Cord Stimulator is offered to patients with chronic and severe pain, who have not responded to other treatment modalities. www.reddinganesthesia.com /dcs.htm   (677 words)

Dorsal Column stimulator medical malpractice case settled by arbitration. Sheets v. Finkenberg and DOE Hospital Dorsal Column stimulator medical malpractice case settled by arbitration. In November of 1995, he underwent the placement of a dorsal column stimulator (DCS) by Dr. Altenau. The plaintiff achieved what Dr. Altenau described as "superb" relief of pain with this device, which delivers electrical stimulation to the spinal cord to block pain impulses. www.vaagelaw.com /cases/CH7.asp   (783 words)

Dorsal Column Nuclei Neurons Recorded in a Brain Stem-Spinal Cord Preparation: Characteristics and Their Responses to ... Dorsal Column Nuclei Neurons Recorded in a Brain Stem-Spinal Cord Preparation: Characteristics and Their Responses to Dorsal Root Stimulation -- Deuchars et al. Dorsal Column Nuclei Neurons Recorded in a Brain Stem-Spinal Cord Preparation: Characteristics and Their Responses to Dorsal Root Stimulation. Intrinsic spontaneous activity and subthreshold oscillations in neurones of the rat dorsal column nuclei in culture jn.physiology.org /cgi/content/abstract/84/3/1361   (427 words)

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