Vasoconstrictor and pilomotor fibres in skin nerves to the cat's tail
Tóm tắt
Postganglionic neurones to the tail's skin of the cat were investigated with regard to their spontaneous activity, response characteristics to somatic stimuli and asphyxia, the conduction velocity of their axons, and the conduction velocity of the preganglionic axons converging on them. The cats were anaesthetized with chloralose, immobilized, and arteficially ventilated. With this regimen the postganglionic neurones were divided into two types: 1. Type 1 neurones are spontaneously active and exhibit reflexes upon somatic stimulation. During asphyxia they are mostly first depressed and then excited for about 2–3 min. Their axons conduct with 0.57±0.13 m/s (mean ± SD). The preganglionic axons converging on them conduct with 5.4±1.6 m/s. 2. Type 2 neurones are not spontaneously active and exhibit with few exceptions no reflexes on somatic stimuli. During asphyxia they are activated after 3–4 min, concomitantly with piloerection, when the activity in type 1 neurones is already decreasing. Their axons conduct with 0.84±0.14 m/s, the preganglionic axons converging on them conduct with 9.9±2.9 m/s. 3. From these characteristics it is concluded that type 1 neurones have vasomotor function and most type 2 neurones pilomotor function.
Tài liệu tham khảo
Bard, P.: A diencephalic mechanism for the expression of rage, with special reference to the sympathetic nervous system. Amer. J. Physiol.84, 490–515 (1928)
Bard, P., Rioch, D., McK.: A study of four cats deprived of neocortex and additional portions of the forebrain. Bull. Johns Hopk. Hosp.60, 73–147 (1937)
Beck, L.: Active reflex dilatation in the innervated perfused hindleg of the dog. Amer. J. Physiol.201, 123–128 (1961)
Beck, L.: Histamine as the potential mediator of active reflex vasodilatation. Fed. Proc.24, 1298–1310 (1965)
Darwin, C.: The expression of the emotions in man and animals. London: John Murray 1872
Graham, B. H., Lioy F.: Histaminergic vasodilatation in the hindlimb of the dog. Pflügers Arch.342, 307–318 (1973)
Grosse, M., Jänig, W.: Vasoconstrictor and pilomotor fibres in skin nerves to the cat's tail. Pflügers Arch.355, R77 (1975)
Horeyseck, G., Jänig, W.: Reflexes in postganglionic fibres within skin and muscle nerves following mechanical non-noxious stimulation of skin. Exp. Brain Res.20, 115–123 (1974a)
Horeyseck, G., Jänig, W.: Reflexes in postganglionic fibres within skin and muscle nerves after noxious stimulation of skin. Exp. Brain Res.20, 125–134 (1974b)
Horeyseck, G., Jänig, W.: Reflex activity in postganglionic fibres within skin and muscle nerves elicited by somatic stimuli in chronic spinal cats. Exp. Brain Res.21, 155–168 (1974c)
Iriki, M., Walther, O.-E., Pleschka, K., Simon, E.: Regional cutaneous and visceral sympathetic activity during asphyxia in the anaesthetized rabbit. Pflügers Arch.322, 167–182 (1971)
Jänig, W.: Central organization of somato-sympathetic reflexes in vasoconstrictor neurones. Brain Res.87, 305–312 (1975)
Jänig, W., Sato, A., Schmidt, R. F.: Reflexes in postganglionic cutaneous fibres by stimulation of Group I to IV somatic afferents. Pflügers Arch.331, 244–256 (1972)
Korner, P. I.: Integrative neural cardiovascular control. Physiol. Rev.51, 312–367 (1971)
Langley, J. N.: On the course and connections of the secretory fibres supplying the sweat glands of the feet of the cat. J. Physiol. (Lond.)12, 347–374 (1891)
Langley, J. N.: The arrangement of the sympathetic nervous system, based chiefly on observations upon pilo-motor nerves. J. Physiol. (Lond.)15, 176–244 (1894)
Langley, J. N., Sherrington, C. S.: On pilo-motor nerves. J. Physiol. (Lond.)12, 278–291 (1891)
Schönung, W., Wagner, H., Simon, E.: Neurogenic vasodilatory component in the thermoregulatory skin blood flow response of the dog. Naunyn-Schmiedeberg's Arch. Pharmacol.273, 230–241 (1972)