Immunoreactive FMRFamide in the Nervous System of the Earthworm, Eisenia foetida : Endocrinology

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A number of large and small cells immunoreactive to FMRFamide (Phe-Met-Arg-Phe-NH_2) antiserum were found in the cerebral, subesophageal and segmental ganglia, and in the ganglia of the pharyngeal plexus of the earthworm, Eisenia foetida. The cerebral ganglion sends the immunoreactive fibers to the subesophageal ganglion through the pharyngeal connectives. The subesophageal ganglion projects the fibers to the segmental ganglia. From the cerabral and subesophageal ganglia, the nerve bundles containing immunoreactive nerve fibers proceed anteriorly towards the prostomium and the ventral region of the anterior segments, respectively. From the ganglia in the pharyngeal plexus, the immunoreactive fibers proceed towards the pharynx. From each segmental ganglion, three immunoreactive segmental nerve trunks emerge bilaterally and extend to the body wall. Then they run dorsally between the circular and longitudinal muscle layers of the body wall. Immunoreactive fibers were observed between the circular muscle layer and the epithelial cell layer of the skin. Furthermore , immunoreactive fibers were observed between the epithelial cell layer and the circular muscle layer of the alimentary canal. Immunoreactive products are occasionally present in contact with the blood vessels in the cerebral and subesophageal ganglia. FMRFamide seems to act both as a neurotransmitter or neuromodulator and as a neurohormone in the earthworm.
社団法人日本動物学会の論文
1989-10-15

Immunoreactive FMRFamide in the Nervous System of the Earthworm, Eisenia foetida : Endocrinology

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