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4. On the Homology of the Neural Gland in the Tunicata with the Hypophysis Cerebri

Published online by Cambridge University Press:  15 September 2014

W. A. Herdman
W. A. Herdman
Affiliation:
Professor of Natural History in University College, Liverpool.
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Extract

In an ordinary simple Ascidian, where both the branchial and atrial apertures are at or near the anterior extremity of the body, the region lying between them—the interoscular area of Laeaze-Duthiers—is small in extent, and contains three important structures, the nerve ganglion, the neural gland, and the dorsal tubercle, lying close together. The ganglion in such a case is elongated dorsoyentrally, and gives off nerves at its two extremities, one set ventrally and anteriorly towards the branchial aperture, and the other set dorsally and posteriorly towards the atrial.

Type
Proceedings 1882-83
Information
Proceedings of the Royal Society of Edinburgh , Volume 12 , 1884 , pp. 145 - 151
Copyright
Copyright © Royal Society of Edinburgh 1884

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References

note * page 145 “On the Anatomy and Physiology of the Tunicate,” Jour. Linn. Soc. Zool., vol. ix. p. 335Google Scholar.

note * page 147 Loc. cit. p. 335.

note † page 147 Proc. Imp. Soc. Nat. Hist., &c., Moscow, vol. xviii. fasc. ii. (in Russian).

note † page 147 Zoologischc Beiträge, iii., “Ueber die Anatomie und Entwicklung von Dolioluin,” p. 61, Leipzig.

§ Archives de Biologie, vol. ii. p. 59.

| Archives de Biologie, vol. ii. p. 211.

note * page 149 I have adopted Balfour's classification (Comparative Embryology, vol. ii. 1881) as follows:—

Chordata.

1. Uvochorda (Tunicata).

2. Cephalochorda (Amphioxus).

3. Vertebrata.

note † page 149 The lining of the peribranchial cavity into which the ducts open in Ascidia mammillata has been already shown to be continuous with the ectoderm on the surface of the body.

note * page 150 A Treatise on Comparative Embryology, vol. ii. p. 359, London, 1881Google Scholar.

note † page 150 Loc. cit., p. 360.

note ‡ page 150 Not the pronephros, since that is found along with the pituitary bodyin many Vertebrates, but possibly more ancestral. Might it not be the homologue of the provisional trochosphere excretory organs described by Hatschek and others in Polygorduis and some Mollusca ?