Journal ArticleDOI
Vagal Afferent Fibres
A. S. Paintal
- Vol. 52, Iss: 1, pp 74-156
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The cervical vagus consists of about 30 thousand fibres of which about 24 000 are sensory in function and about 3 thousand are myelinated and have been the centre of attraction in electrophysiological studies chiefly owing to the relative ease with which impulses can be recorded in them.Abstract:
The cervical vagus consists of about 30 thousand fibres of which about 24 000 are sensory in function (Agostoni, Chinnock, Daly and Murray 1957). Of the latter about 3 thousand are myelinated and have been the centre of attraction in electrophysiological studies chiefly owing to the relative ease with which impulses can be recorded in them. In the 19th International Physiological Congress, Whitteridge reviewed briefly all that was known about these myelinated afferent fibres which arose from endings of various kinds in the heart and lungs (Whitteridge 1953) and although more detailed information about certain myelinated sensory endings has been gained since that time, the main advance has been in the direction of recording impulse in non-medullated fibres from endings in the gastro-intestinal tract [Paintal 1953 (d), 4954 (a), (b); Iggo 1955, 1957 (b)]. Till Iggo’s clear demonstration (Iggo 1958) that the fibres concerned are mostly non-medullated, it was generally imagined that unitary discharges in non-medullated fibres could be recorded only with great difficulty owing to their small size. It was felt that if recording impulses in single fibres of small myelinated fibres presented certain difficulties, it would be still more difficult to record impulses in nonmedullated fibres. However, as pointed out by Iggo (1958), the situation is probably not comparable because non-medullated fibres occur in small bundles which can probably be dissected as such. Since there are many more non-medullated afferent fibres (21 000) than medullated ones (3 000) (Fig. 1), this therefore opens up a practically unexplored field for future work.read more
Citations
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Journal ArticleDOI
Brain stem projections of sensory and motor components of the vagus complex in the cat: II. Laryngeal, tracheobronchial, pulmonary, cardiac, and gastrointestinal branches.
TL;DR: The central sensory and motor connections of various respiratory, cardiovascular, and gastrointestinal viscera were analyzed using the transganglionic and retrograde transport of horseradish peroxidase.
Book ChapterDOI
Afferent vagal C fibre innervation of the lungs and airways and its functional significance
TL;DR: This review has attempted to give an account of an afferent vagal input from the lower respiratory tract that has still to be explored fully, and to present experimental evidence that this fine fibre afferent system plays a significant role in the neural control of respiratory function in both normal and pathological circumstances.
Journal ArticleDOI
Mechanism of stimulation of type J pulmonary receptors
TL;DR: The responses of type J pulmonary receptors (identified according to existing criteria) were studied in anaesthetized cats by recording impulses in individual vagal afferent fibres whose conduction velocity ranged from 0·8 to 7 m/sec.
Journal ArticleDOI
Evidence for L-glutamate as the neurotransmitter of baroreceptor afferent nerve fibers.
TL;DR: Microinjection of L-glutamate into the intermediate nucleus tractus solitarii in anesthetized rats elicits hypotension, bradycardia, and apnea, simulating baroreceptor reflexes, which indicates that L-Glutamate may be the neurotransmitter of afferent nerve fibers from arterial baroreceptors.
Journal ArticleDOI
Sensory Irritation by Airborne Chemicals
TL;DR: In this paper, Sensory Irritation by Airborne Chemicals: Critical Reviews in Toxicology: Vol. 2, No. 3, pp. 299-363, was discussed.
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E. D. Adrian,D. W. Bronk +1 more
TL;DR: The present investigation has obtained direct records of the discharge in individual motor nerve fibres innervating the diaphragm, and the results seem so definite that it is unnecessary to set out the whole of the evidence which has been brought forward by indirect methods in the past.
Journal ArticleDOI
The impulses produced by sensory nerve-endings: Part II. The response of a Single End-Organ.
E. D. Adrian,Yngve Zotterman +1 more
TL;DR: An instrument consisting of a capillary electrometer with a 3-valve amplifier, capable of recording the action currents set up in sensory nerve fibres by appropriate stimulation of their end-organs is described.