Penelope M. Jenkin's Control of Growth and Metamorphosis. Animal Hormones: A PDF

By Penelope M. Jenkin

ISBN-10: 0080156487

ISBN-13: 9780080156484

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Additional info for Control of Growth and Metamorphosis. Animal Hormones: A Comparative Survey

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2-26). The presence of a membrane surrounding the granules can be seen in the micrographs. It has also been shown in Crustacea, where it has been ruptured by the application of detergents to release an active chromatophorotrophic hormone from inactive granules (Perez-Gonzalez, 1957). This concept of a confining membrane seems now to replace that of the hormone being rendered inactive by being bound to a "carrier" within the neurosecretory cells (Part I, pp. 20-21). It is postulated that when the granules reach a certain degree of concen­ tration they tend so to disorganize the ergastoplasm as to prevent further synthesis of the secretion (see Fig.

En 40 SOURCES OF HORMONES RELATED TO MORPHOGENESIS which is a neurohaemal organ, this gland appears to be derived from an intucking of ectodermal epithelium. It retains a tube connecting it to the skin, but does not open to the exterior. The gland is already fully differen­ tiated at the time of hatching, but it grows in size up to the time of sexual maturity, after which it regresses sharply. During its growth, the central lumen becomes filled with several small masses of a dense secretion, which has a very marked affinity for Gomori's paraldehyde fuchsin stain and also for alcian blue, although it is apparently not a neurosecretion.

111 MG MG EK? 111 §§ MG MG MG MG? Type of action TABLE 2. ECTODERMAL SOURCES OF MORPHOGENETIC AND ENDOCRINOKINETIC HORMONES t;j \0 W ~ t;j Z o ~ > m Z ~ (') ~ o m Z ..... ~ ..... en 40 SOURCES OF HORMONES RELATED TO MORPHOGENESIS which is a neurohaemal organ, this gland appears to be derived from an intucking of ectodermal epithelium. It retains a tube connecting it to the skin, but does not open to the exterior. The gland is already fully differen­ tiated at the time of hatching, but it grows in size up to the time of sexual maturity, after which it regresses sharply.

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Control of Growth and Metamorphosis. Animal Hormones: A Comparative Survey by Penelope M. Jenkin


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