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Biomedical subjects

E Manni

Publications and source records attributed to E Manni.

At least 55 records · Page 3Linked to original sources
PubMed1976

Somatotopic localization of the eye muscle afferents in the semilunar ganglion.

In the medial dorsolateral portion of the semilunar ganglion of curarized and anaesthetized lambs a cellular pool has been identified which contains the perikarya of the first-order neurons of the eye muscle proprioception. Responses to moderate manual stretch of individual eye muscles were recorded by means of tungsten microelectrodes, from single units of the ganglion. They were of the type induced by muscle spindle excitation. Such responses showed a somatotopic localization. The superior rectus and the superior oblique muscles were represented in the most dorsal layers of the ganglion, while the inferior rectus and the inferior oblique muscles projected on the most ventral portion of the pool. The medial and the lateral recti were represented in the medial and lateral parts and occasionally wedged themselves between the cells innervating the superior and the inferior muscles. Thus a somatotopic arrangement of the eye muscle proprioception has been demonstrated for the first time in the semilunar ganglion.

Animals↗
PubMed1975

Convergence of afferent impulses from individual semicircular canals of pontine reticular units.

The effect of afferent impulses on single pontine RF units was recorded by means of tungsten microelectrodes in 22 curarized guinea pigs followed thermic stimulation of individual semicircular canals. The labyrinthine stimulation consisted of short-lasting circumscribed heating (45 degrees C) of the canals through a silver thermode. Unitary response to labyrinthine stimulation was characterized by excitation and inhibition of rest discharge rate. Out of 86 units, 66 received bilateral labyrinthine influences responding in greatest number (20 units) to four semicircular canals. Only two units were unaffected. No significant difference in RF responses was noticed between concordant and antagonistic canals. Reticular formation units showed great degree of facilitation of response and convergence of impulses from the single six semicircular canals.

Action Potentials↗