Fibre size and content of the anterior tibial nerve of the foot.

Swallow, M

doi:10.1136/jnnp.29.3.205

Cited by 123 publications

(61 citation statements)

References 12 publications

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“…As in the median and ulnar nerves the maximum velocity in the nerves of the leg was lower at 40 to 65 years of age than at 15 to 30 years, slowing with age being equally pronounced along distal as along proximal segments. The (Swallow, 1966;O'Sullivan and Swallow, 1968) and segmental demyelination is uncommon below 65 years of age (Lascelles and Thomas, 1966 Fig. 9.…”

Section: Discussionmentioning

confidence: 99%

Normal sensory conduction in the nerves of the leg in man

Behse

Buchthal

1971

Journal of Neurology, Neurosurgery & Psychiatry

170

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Sensory conduction has most often been measured in the nerves of the upper extremity. Gilliatt, Goodman, and Willison (1961) were the first to record sensory potentials in the leg, from the lateral popliteal nerve at the capitulum fibulae. The amplitude of the sensory potentials was of the order of 1 to 3 ,uV, less than a third as large as in the proximal segments of the nerves of the upper extremities. The sensory potentials of distal segments of the nerves of the leg were often buried in noise (Mayer, 1963;Downie and Scott, 1967;Ertekin, 1969) and electronic averaging was necessary to record the potentials (Buchthal and Rosenfalck, 1966;Mavor and Atcheson, 1966;Sato, 1967; Shiozawa and Mavor, 1968;Lovelace, Myers, and Zablow, 1969).The purpose of the study presented in this report was to record sensory potentials along the superficial peroneal, sural, and posterior tibial nerves with improved resolution by recording close to the nerve, by using a special input circuit (Buchthal and Rosenfalck, 1966) and by electronic averaging. In this way, maximum and minimum conduction velocities were determined along distal and proximal segments of the nerves in young and old subjects and the shape of the potentials could be evaluated.

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Section: Discussionmentioning

confidence: 99%

Normal sensory conduction in the nerves of the leg in man

Behse

Buchthal

1971

Journal of Neurology, Neurosurgery & Psychiatry

170

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“…However, the former figure was estimated on the basis of two additional approximations. Innervation of the deep structures was not taken into account, nor was allowance made for the reduction of the number of nerve elements with age (Corbin & Gardner, 1937;Gardner, 1940;Swallow, 1966;O'Sullivan & Swallow, 1968). Buchthal & Rosenfalck's preparations were taken from older subjects (49 and 62 yr) than those in the present study.…”

Section: Resultsmentioning

confidence: 99%

Tactile sensibility in the human hand: relative and absolute densities of four types of mechanoreceptive units in glabrous skin.

Johansson¹,

Vallbo²

1979

The Journal of Physiology

1,098

693

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SUMMARY1. Single unit impulses were recorded with percutaneously inserted tungsten needle electrodes from the median nerve in conscious human subjects.2. A sample of 334 low threshold mechanoreceptive units innervating the glabrous skin area of the hand were studied. In accordance with earlier investigations, the units were separated into four groups on the basis of their adaptation and receptive field properties: RA, PC, SA I and SA II units. 3. The locations of the receptive fields of individual units were determined and the relative unit densities within various skin regions were calculated. The over-all density was found to increase in the proximo-distal direction. There was a slight increase from the palm to the main part of the finger and an abrupt increase from the main part of the finger to the finger tip. The relative densities in these three regions were 1, 1P6, 4-2.4. The differences in over-all density were essentially accounted for by the two types of units characterized by small and well defined receptive fields, the RA and SA I units, whereas the PC and SA II units were almost evenly distributed over the whole glabrous skin area.5. The spatial distribution of densities supports the idea that the RA and SA I units account for spatial acuity in psychophysical tests. This capacity is known to increase in distal direction along the hand.6. On the basis of histological data regarding the number of myelinated fibres in the median nerve, a model of the absolute unit density was proposed. It was estimated that the density of low threshold mechanoreceptive units at the finger tip is as high as 241 u./cm2, whereas in the palm it is only 58 u./cm2.

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“…Then one of these fascicles which was considered the most representative was selected for fibre ' (Espir and Harding, 1961;Swallow, 1966).…”

Section: Methodsmentioning

confidence: 99%