VITAL STAINING AND ELECTRON MICROSCOPY OF THE INTRAMUSCULAR NERVE ENDINGS IN THE NEUROPATHY OF ADULT CæLIAC DISEASE

Brain ◽  
1966 ◽  
Vol 89 (4) ◽  
pp. 663-682 ◽  
Author(s):  
W. T. COOKE ◽  
A. G. JOHNSON ◽  
A. L. WOOLF
Keyword(s):  
Electron Microscopy ◽  
Vital Staining ◽  
Nerve Endings ◽  
Intramuscular Nerve

Electrophysiological Investigations of the Heart of Squilla Mantis

1964 ◽  
Vol 41 (4) ◽  
pp. 701-722
Author(s):  
HILARY F. BROWN
Keyword(s):  
Heart Muscle ◽  
Vital Staining ◽  
Heart Beat ◽  
Nerve Endings ◽  
Resting Potential ◽  
Muscle Membrane ◽  
Absolute Level ◽  
Local Contraction ◽  
Set Up ◽  
Junction Potential

1. The histology of the heart muscle of Squilla mantis is briefly described. Vital staining with methylene blue revealed only a sparse distribution of nerve endings on the muscle network. 2. Intracellular electrodes recorded from the muscle a multi-peaked junction potential at each heart beat. Each peak followed an impulse in the ganglionic nerve trunk burst. All the peaks were approximately the same height and none more than about three-fifths the height of the resting potential (average values for 10 hearts: resting potential, 51.5 mV; junction potential, 27.6 mV). 3. Inverted (negative-going) signals were never recorded just outside the muscle membrane suggesting that at all the points which were searched the membrane was acting passively. 4. Driving Squilla heart muscle via its nerve supply at 100 stimuli per second did not depolarize it by more than about 35 mV, nor would depolarizing pulses given directly to a fibre through an intracellular electrode set up any sort of current-generating activity in the membrane. 5. The magnitude of muscle contraction, measured locally using a microelectrode transducer, depended on the absolute level of the potential across the membrane, rather than on change of potential. 6. A directly applied electrotonus, similar in magnitude and duration to the nerve-induced junction potential, caused a local contraction of similar magnitude. 7. The recorded junction potential is therefore interpreted as the composite record of the electrotonus spreading within the muscle network from current initiated at relatively infrequent active points on the muscle membrane (the nerve endings) which passively depolarizes the rest of the membrane. 8. The junction potentials showed facilitation when the intervals between them were below 4 sec. At intervals less than 630 msec, they summed.

THE INTRAMUSCULAR NERVE ENDINGS IN MYASTHENIA GRAVIS

Brain ◽  
1960 ◽  
Vol 83 (1) ◽  
pp. 10-23 ◽  
Author(s):  
E. R. BICKERSTAFF ◽  
A. L. WOOLF
Keyword(s):  
Myasthenia Gravis ◽  
Nerve Endings ◽  
Intramuscular Nerve

scholarly journals Cytochemical localization of ecto-ATPases in rat neurohypophysis.

1996 ◽  
Vol 44 (2) ◽  
pp. 103-111 ◽  
Author(s):  
S Thirion ◽  
J D Troadec ◽  
G Nicaise
Keyword(s):  
Electron Microscopy ◽  
Plasma Membrane ◽  
Atpase Activity ◽  
Outer Surface ◽  
Nerve Endings ◽  
Glutaraldehyde Fixation ◽  
Cytochemical Localization ◽  
Cytochemical Method ◽  
Ca Pump ◽  
Dependent Atpase

We studied the distribution of Ca(2+)- or Mg(2+)-dependent ATPase activity in rat neurohypophysis using the lead cytochemical method of Ando et al. In electron microscopy, precipitates were found lining the outer surface of the plasma membrane surrounding nerve endings and pituicytes. These precipitates were believed to represent the activity of ecto-ATPases (as opposed to Ca pump ATPases) for the following reasons: there was equal activation by Ca2+ in the absence of Mg2+ or Mg2+ in the absence of Ca2+; the effects of the two ions were not additive; there was activation by ATP or GTP; and there was resistance to glutaraldehyde fixation, to high (10 mM) Ca2+ concentrations, and to various inhibitors such as NEM, vanadate, oligomycin, quercetin, p-chloromercuribenzoate, ouabain, and levamisole. Cytosolic activity observed in certain nerve endings in the same conditions of incubation but more sensitive to NEM is also described and discussed.

scholarly journals Complex Sensory Corpuscles in the Upper Jaw of Horsfield’s Tortoise (Testudo horsfieldii)

2009 ◽  
Vol 78 (2) ◽  
pp. 193-197 ◽  
Author(s):  
Marcela Buchtová ◽  
Libor Páč ◽  
Zdeněk Knotek ◽  
František Tichý
Keyword(s):  
Electron Microscopy ◽  
Oral Cavity ◽  
Inner Core ◽  
Light And Electron Microscopy ◽  
Sensory Nerve ◽  
Nerve Endings ◽  
Upper Lip ◽  
Novel Structure ◽  
Upper Jaw ◽  
Rostral Part

The sensory corpuscles of Testudo horsfieldii in the skin of the upper lip and face were studied with light and electron microscopy. The sensory corpuscles were situated under epidermis; in the corium and also between the upper jaw bone tissues in the rostral part of oral cavity. The skin sensory corpuscles with a ramified inner core were grouped in clusters. Within the corpuscle there were several simple inner cores embedded within a common superficial capsule. The complex corpuscles have a novel structure in comparison to what has been described for sensory nerve endings in turtle. The complex sensory corpuscles probably function as mechanoreceptors important for monitoring the movement of the keratinized ridges and the most rostral part of the upper jaw, the rhamphotheci.

A case of myasthenia gravis with changes in the intramuscular nerve-endings

1956 ◽  
Vol 71 (1) ◽  
pp. 173-178 ◽  
Author(s):  
A. L. Woolf ◽  
H. J. Bagnall ◽  
P. Bauwens ◽  
Edwin R. Bickerstaff
Keyword(s):  
Myasthenia Gravis ◽  
Nerve Endings ◽  
Intramuscular Nerve
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