Al J. Cannone

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1. Synaptic currents were evoked at the neuromuscular junction of the deep extensor abdominal muscle of the crayfish by direct depolarization of motor nerve endings. 2. Quantal content and time course of neurotransmitter release were determined from delay histograms of unitary release events recorded with a macropatch clamp technique. 3. Synaptic(More)
1. Articulation of the coxobasal joint of the posterior leg of the shore crab,Carcinus maenas, through its full 105° arc of movement translates into a linear displacement of the levator receptor strand of 3–4 mm (crab carapace widths 60–75 mm, respectively) (Fig. 2). 2. Both levator afferents, the distally inserting L1 (diameter approximately 30 μm) and the(More)
Two of the three mechanoreceptor neurones which innervate the crab thoracic-coxal muscle receptor organ are non-spiking. The third, the small diameter P neurone, employs graded amplitude receptor potentials with either spikes or graded amplitude active membrane responses superimposed. An excitatory synaptic connection between one of the larger non-spiking(More)
1. An interaction exists between two proprioceptive afferent neurons innervating the thoracic-coxal muscle receptor organ (TCMRO) of the crab, Carcinus maenas. Intracellular recordings were made from the extraganglionic regions of the afferents in order to characterize this interaction and its effects on sensory feedback. 2. A current-induced depolarization(More)
The small diameter P neurone (7 microns) is here characterized as an afferent of the crab thoracic-coxal muscle receptor organ (TCMRO), in addition to the S and T neurones (50-60 microns). The P neurone employs both passively conducted, graded amplitude receptor potentials and, superimposed upon these, either graded active membrane responses or constant(More)
BACKGROUND The aim of this study was to identify the prevalence of allergic disease in young soccer players compared to age-matched students and to evaluate if this prevalence changes as the intensity of training increases. METHODS A modified ECRHS questionnaire was administered to 194 soccer players divided by age as Beginners (8-11 years), Juniors(More)
Stretching the thoracic-coxal muscle receptor organ (T-C MRO) of the crab,Carcinus maenas, depolarises its two non-spiking afferents (the S and T fibres), and reflexly excites its own two receptor motoneurones, Rm1 and Rm2. This ‘autogenic’ reflex of the latter, thinner efferent axon, which has a smaller contractile effect than Rm1 and, unlike Rm1, also(More)
The two non-spiking afferent neurones (T and S fibres) of the crab's thoracic-coxal muscle receptor organ mediate antagonistic reflex controls upon the specific receptor motoneurone (Rm1). Depolarization of the 'in-series' T fibre, by receptor muscle stretch or intracellular current injection, reflexly excites Rm1, whereas length- or current-induced S fibre(More)