Society and Nature - download pdf or read online

By Hans. Kelsen

ISBN-10: 0405055072

ISBN-13: 9780405055072

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Input from other skin regions on the female rat important for lordos- A . - ... -"r... ----. '----,>---". .. " . r-.. ","--_ ~""'-rt , Figure 3 -2. Effect of severing pudendal nerve on dorsal root multiunit responses: recordings of dorsal root L6 • (A) Before pudendal nerve was severed. (B) After pudendal nerve was severed. Thickened portions of time marker lines: skin within the pudendal nerve receptive field was brushed. The dorsal root response to skin stimulation occurred before (A) but not after (B) the pudendal nerve was cut.

Dotted line (in Tn through L2): extent of the separation of skin from the underlying tissues due to the dorsal approach to the cord for electrode insertion. For L3 , the largest (dotted line) and smallest (dashed line) examples of receptive field size are superimposed on the representative field (shaded area). The 13th rib is the most posterior rib. The crest of the ilium is indicated. (From Kow & Pfaff, 1975b) medial half of the spinal gray, while units with receptive fields on the proximal or dorsal parts of a dermatome tended to be located in the lateral half of the spinal gray (Table 4-1).

M 800~ n B ::: E 400 ~- 0- 0 '" eoof j~ 400t o c --------------~ L_ Figure 4 -3 A -co Responses of pressure-sensitive neurons recorded in the spinal cord. (A) Most of these units were excited by pressure on the skin. (B) Some responses outlasted the stimulus. (C) A few units were inhibited by cutaneous pressure. , 1980b) excited by pressure (Figure 4-3A, B). When continuously increasing pressure on the receptive field of such units reached a threshold level, their firing rate would increase to a plateau level, which then was maintained despite further increases in pressure.

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Society and Nature by Hans. Kelsen

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