The ionic regulation of action potentials in the axon of a stretch receptor neuron of the stick insect (Carausius morosus)

1977 ◽  
Vol 122 (1) ◽  
pp. 45-52
Author(s):  
L. H. Finlayson ◽  
I. Orchard
Keyword(s):  
Action Potentials ◽  
Stick Insect ◽  
Stretch Receptor ◽  
Receptor Neuron ◽  
Ionic Regulation ◽  
Carausius Morosus

Calcium Action Potentials in the Skeletal Muscle Fibres of the Stick Insect Carausius Morosus

1981 ◽  
Vol 93 (1) ◽  
pp. 257-267 ◽  
Author(s):  
FRANCES M. ASHCROFT
Keyword(s):  
Action Potential ◽  
Action Potentials ◽  
Inhibitory Effect ◽  
Stick Insect ◽  
Muscle Fibres ◽  
Carausius Morosus ◽  
Outward Currents ◽  
Ca Antagonist ◽  
Ventral Longitudinal Muscle ◽  
Skeletal Muscle Fibres

The ionic requirements for the generation of action potentials in the ventral longitudinal muscle fibres of the stick insect, Carausius morosus, were investigated. Ca-free Ringer rapidly and reversibly abolished the action potential. In the presence of tetraethylammonium (TEA) ions (to suppress outward currents) the overshoot of the action potential changed 26 mV for a 10-fold change in [Ca]o. The maximum rate of rise of the action potential (measured in TEA Ringer) showed saturation at high [Ca]o. Cobaltous ions (20 mM) and the organic Ca antagonist D 600 (5×10−4g/ml) reversibly inhibited the action potential; the inhibitory effect of 1 mM-La3+ was irreversible. Barium and strontium, but not magnesium, were able to substitute for calcium as charge carriers. These results suggest that an inward movement of Ca2+ underlies the action potential of Carausius fibres.

A Study of the Function of the Neural Fat-Body Sheath in the Stick Insect, Carausius Morosus

1972 ◽  
Vol 56 (1) ◽  
pp. 129-137
Author(s):  
J. E. TREHERNE
Keyword(s):  
Action Potentials ◽  
Sodium Level ◽  
Fat Body ◽  
Sodium Concentration ◽  
Stick Insect ◽  
Rapid Decline ◽  
Carausius Morosus

1. The effects of variation in the sodium concentration of the bathing media on axonal function has been measured in de-sheathed connectives in the presence of the overlying neural fat-body sheath. 2. The response to solutions of the same sodium concentration as the haemolymph (15 mM/1) was found to be essentially similar to that recorded in de-sheathed connectives in the absence of the fat-body sheath, there being a rapid decline in amplitude of the recorded action potentials in both preparations. 3. On the basis of these observations it is concluded that the neural fat-body sheath is unlikely to be involved in the regulation of the extra-neuronal sodium level.

Some Preliminary Observations on the Effects of Cations on Conduction Processes in the Abdominal Nerve Cord of the Stick Insect, Carausius Morosus

1965 ◽  
Vol 42 (1) ◽  
pp. 1-6
Author(s):  
J. E. TREHERNE
Keyword(s):  
Electrical Stimulation ◽  
Nerve Conduction ◽  
Nerve Cord ◽  
Action Potentials ◽  
Ionic Composition ◽  
Stick Insect ◽  
Carausius Morosus ◽  
Stimulation Of

1. In the haemolymph of the stick insect Carausius morosus the concentration of potassium exceeds that of sodium and the concentration of magnesium exceeds that of calcium. The implications of this situation for nerve conduction have been studied. 2. Conduction is maintained in intact and desheathed preparations of the fourth adbominal ganglion under irrigation with a solution resembling haemolymph in ionic composition. 3. Action potentials recorded in response to electrical stimulation of the nerve cord decline in sodium-free solutions, both in intact and in desheathed preparations. 4. Conduction declines slowly under irrigation with magnesium-free solutions both in intact and in desheathed preparations.

Sex chromosomes and origin of males and sex mosaics of the parthenogenetic stick insect Carausius morosus Br.

Chromosoma ◽  
1980 ◽  
Vol 79 (1) ◽  
pp. 105-114 ◽  
Author(s):  
Laas P. Pijnacker ◽  
Margriet A. Ferwerda
Keyword(s):  
Sex Chromosomes ◽  
Stick Insect ◽  
Carausius Morosus
Sign in / Sign up

Export Citation Format

Share Document