Kiyoaki Kuwasawa

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The heart of Squilla oratoria contains a cardiac ganglion that consists of 15 intrinsic neurons, supplied by a pair of inhibitory nerves and two pairs of excitatory nerves, arising from the central nervous system. These comprise the extrinsic cardiac innervation. The paired cardio-inhibitor (CI) nerves run out in the 10th pair of nerve roots emerging from(More)
In crustacean neurogenic hearts, the myocardium contracts under the tight control of rhythmically active neurons of the cardiac ganglion located inside the heart. We demonstrated that the myocardium of Bathynomus doederleini was sensitive to glutamate, quisqualate, and kainate, and that the tension of myocardial cells developed in a dose-dependent manner.(More)
The constituent elements of the gills of Aplysia kurodai and A. juliana were examined for the presence of biogenic amines using histochemical, immunocytochemical, and HPLC techniques. Aminergic elements were revealed by glyoxylic acid-induced fluorescence in the branchial nerve, branchial ganglion, branchial vessels, and pinnules in both species. Three(More)
The intra-cardiac nervous system of the decapod heart is composed of large and small ganglionic cells (LGCs and SGCs) and axons of extrinsic cardio-acceleratory and-inhibitory neurons (CAs and CIs). Candidate neurotransmitters for the neurons have been determined by pharmacological, cytochemical and immunocytochemical tests. SGCs may be cholinergic, LGCs(More)
1. We have used anatomical, histological, and electrophysiological techniques to study the innervation of the heart of an isopod,Bathynomus doederleini. 2. The heart beat was driven by a cardiac ganglion consisting of twelve morphologically identical neurones. 3. The paired anterior cardiac nerves each contained five axons: three cardio-regulator axons, and(More)
The acceleratory and inhibitory cardio-regulatory nerves of hermit crabs (Aniculus aniculus, Dardanus crassimanus) were studied using histochemical, immunocytochemical and pharmacological tests. Glyoxylic acid-induced fluorescence was observed in two of three axons of the dorsal cardiac nerve. One axon of the nerve showed gamma-aminobutyric acid-like(More)
In Bathynomus doederleini all of the cardioarterial valves located at the origin of the lateral arteries are dilated by impulses of lateral cardiac nerves. Tactile stimuli applied to sensillar setae depress impulse activities of the 1st and 5th lateral cardiac nerves. The 1st lateral cardiac nerve controls the valve of the lateral artery which runs to the(More)
1. InBathynomus doederleini, there are cardio-arterial valves at the junctions between the heart and the arteries. These comprise: one anterior median artery, a pair of anterior lateral arteries and five pairs of lateral arteries. 2. The valves at the cardiac junctions of the three anterior arteries receive innervation from a pair of anterior cardiac(More)
We identified cell bodies of the first and second cardio-acceleratory nerves (CA1 and CA2) in the second and third thoracic ganglia of Bathynomus doederleini. Each cell body gives rise to a single axon, which diverges into two major processes in each case. One of the two major axon processes from the second thoracic ganglion runs to the heart via the third(More)
The presence of a synaptic connection between neuron L7 of the abdominal ganglion and branchial ganglionic neurons (BGNs) was reexamined by means of electrophysiology and fluorescent microscopy using three Aplysia species. We succeeded in recording excitatory postsynaptic potentials produced in a BGN, which followed impulses of L7 one-to-one with a constant(More)