Organization of a fourth somatosensory area of cortex in cat

1983 ◽  
Vol 50 (4) ◽  
pp. 910-925 ◽  
Author(s):  
H. R. Clemo ◽  
B. E. Stein
Keyword(s):  
Body Surface ◽  
Single Unit ◽  
Receptive Fields ◽  
The Body ◽  
Single Unit Recording ◽  
Opposite Orientation ◽  
Unit Recording ◽  
Anterior Ectosylvian Sulcus ◽  
Visual Cells ◽  
Somatotopic Map

The organization of sensory representations in the cortex of the anterior ectosylvian sulcus (AES) of the cat was investigated using single-unit recording techniques. Somatic, auditory, and visual cells were found in the AES but were partially segregated. Somatic cells were concentrated in the rostral two-thirds of the sulcus, auditory cells were found in the caudal third, and visual cells were distributed along the fundus. A distinct, heretofore unknown, somatotopic representation of the body surface was observed in the AES and was designated SIV. The representation of the body in SIV extends along a rostrocaudal axis and the entire somatotopic map is inverted, with the head rostral and the hindquarters caudal. The representation of the paws extends over the lip of the sulcus to abut the paw representations in SII, and the SIV-SII boundary is marked by a reversal in the sequence of receptive fields along the AEG-AES. The SIV representation (SII) on the crown of the anterior ectosylvian gyrus (AEG). The somatotopic map in SII was found to extend further lateral on the AEG than shown by some investigations and it contains a double representation of the limbs: a large representation with the limbs having the opposite orientation to and abutting the SIV map and a smaller representation located more medial on the AEG and extending into the suprasylvian sulcus. The presence of this double representation may help to explain previous discrepancies regarding the overall orientation of the body in SII.

scholarly journals Pressure-clamped single-fiber recording technique: A new recording method for studying sensory receptors

2020 ◽  
Vol 16 ◽  
pp. 174480692092785 ◽  
Author(s):  
Mayumi Sonekatsu ◽  
Hiroshi Yamada ◽  
Jianguo G Gu
Keyword(s):  
Nerve Fiber ◽  
Single Unit ◽  
Single Fiber ◽  
Single Unit Recording ◽  
Sensory Receptors ◽  
Unit Recording ◽  
Recording Technique ◽  
C Fibers ◽  
Recording Method ◽  
Single Nerve

An electrophysiological technique that can record nerve impulses from a single nerve fiber is indispensable for studying modality-specific sensory receptors such as low threshold mechanoreceptors, thermal receptors, and nociceptors. The teased-fiber single-unit recording technique has long been used to resolve impulses that are likely to be from a single nerve fiber. The teased-fiber single-unit recording technique involves tedious nerve separation procedures, causes nerve fiber impairment, and is not a true single-fiber recording method. In the present study, we describe a new and true single-fiber recording technique, the pressure-clamped single-fiber recording method. We have applied this recording technique to mouse whisker hair follicle preparations with attached whisker afferents as well as to skin-nerve preparations made from mouse hindpaw skin and saphenous nerves. This new approach can record impulses from rapidly adapting mechanoreceptors (RA), slowly adapting type 1 mechanoreceptors (SA1), and slowly adapting type 2 mechanoreceptors (SA2) in these tissue preparations. We have also applied the pressure-clamped single-fiber recordings to record impulses on Aβ-fibers, Aδ-fibers, and C-fibers. The pressure-clamped single-fiber recording technique provides a new tool for sensory physiology and pain research.

On the search for the vocal pattern generator. A single-unit recording study

Neuroreport ◽  
2000 ◽  
Vol 11 (9) ◽  
pp. 2031-2034 ◽  
Author(s):  
Frank Düsterhöft ◽  
Udo Häusler ◽  
Uwe Jürgens
Keyword(s):  
Single Unit ◽  
Pattern Generator ◽  
Single Unit Recording ◽  
Unit Recording

scholarly journals Responses of thalamic neurons to itch- and pain-producing stimuli in rats

2018 ◽  
Vol 120 (3) ◽  
pp. 1119-1134 ◽  
Author(s):  
Brett Lipshetz ◽  
Sergey G. Khasabov ◽  
Hai Truong ◽  
Theoden I. Netoff ◽  
Donald A. Simone ◽  
...  
Keyword(s):  
Single Unit ◽  
Electrophysiological Study ◽  
Receptive Fields ◽  
The Body ◽  
Cell Column ◽  
Thalamic Neurons ◽  
Medial Nucleus ◽  
Anesthetized Rats ◽  
Transmission Of Information ◽  
Posterior Medial Nucleus

Understanding of processing and transmission of information related to itch and pain in the thalamus is incomplete. In fact, no single unit studies of pruriceptive transmission in the thalamus have yet appeared. In urethane-anesthetized rats, we examined responses of 66 thalamic neurons to itch- and pain- inducing stimuli including chloroquine, serotonin, β-alanine, histamine, and capsaicin. Eighty percent of all cells were activated by intradermal injections of one or more pruritogens. Forty percent of tested neurons responded to injection of three, four, or even five agents. Almost half of the examined neurons had mechanically defined receptive fields that extended onto distant areas of the body. Pruriceptive neurons were located within what appeared to be a continuous cell column extending from the posterior triangular nucleus (PoT) caudally to the ventral posterior medial nucleus (VPM) rostrally. All neurons tested within PoT were found to be pruriceptive. In addition, neurons in this nucleus responded at higher frequencies than did those in VPM, an indication that PoT might prove to be a particularly interesting region for additional studies of itch transmission. NEW & NOTEWORTHY Processing of information related to itch within in the thalamus is not well understood, We show in this, the first single-unit electrophysiological study of responses of thalamic neurons to pruritogens, that itch-responsive neurons are concentrated in two nuclei within the rat thalamus, the posterior triangular, and the ventral posterior medial nuclei.

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