. The biology of marine animals. Marine animals; Physiology, Comparative. 516 THE BIOLOGY OF MARINE ANIMALS they were produced and secreted in an endocrine organ, the sinus gland (Fig. (a)). This gland is usually located in the eye-stalk of malacostraca, but in some forms (isopods, anomuran Upogebia, etc.) the sinus gland lies near the brain. The gland is richly innervated and contains numerous secretory inclusions. It is now established that the sinus gland belongs to the category of neurosecretory organs. Secretory cells in various parts of the central nervous. Fig. (a). Location o
. The biology of marine animals. Marine animals; Physiology, Comparative. 516 THE BIOLOGY OF MARINE ANIMALS they were produced and secreted in an endocrine organ, the sinus gland (Fig. (a)). This gland is usually located in the eye-stalk of malacostraca, but in some forms (isopods, anomuran Upogebia, etc.) the sinus gland lies near the brain. The gland is richly innervated and contains numerous secretory inclusions. It is now established that the sinus gland belongs to the category of neurosecretory organs. Secretory cells in various parts of the central nervous. Fig. (a). Location of the Sinus Gland in the Eyestalk of the Prawn Palaemon serratus. The Right Eye is Viewed from Above, and a Small Aper- ture has been Cut in the Cuticle above the Sinus Gland (from Knowles, 1950) (b) Diagrammatic Representation of the Anterior Region of the Nervous System of the Sand Shrimp {Crangon vulgaris (from Brown and Ederstrom (15), and Turner (68).) cc, circumoesophageal connective; eg, connective ganglion; e, medulla externa; /', medulla interna; m, muscle; oe, oesophagus; sg, sinus gland; /, medulla terminalis; tc, tritocerebral commissure. system (x-organ of the eye-stalk, brain, thoracic ganglia) send axons to the sinus gland, where their swollen terminals form the secretory mass of the organ. Secretory material (the hormonal precursors) passes down the axons and is stored in the sinus gland, whence it is released into the blood stream when occasion demands. Another important neurosecretory organ of malacostracans occurs in the post-commissure (tritocerebrum) (Fig. (6)). Release of hormonal material from the neurosecretory organs is regu-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers
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