Seiichiro Kawashima (auth.), Professor Akira Matsumoto,'s Atlas of Endocrine Organs: Vertebrates and Invertebrates PDF

By Seiichiro Kawashima (auth.), Professor Akira Matsumoto, Professor Susumu Ishii (eds.)

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Extra info for Atlas of Endocrine Organs: Vertebrates and Invertebrates

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FSH and LH cells are therefore called GTH cells. In lampreys, TSH cells predominate in the rostral region, whereas GH, PRL, and GTH cells are more numerous in the caudal region. The different secretory cell types in the teleost pars distalis are often separated into separate zones to form regional cell aggregations. Fish PRL and GH cells are localized in the rostral and caudal zones, respectively. In the intermediate zone, ACTH cells are numerous in the dorsal part, TSH cells in the central, and GTH cells in the ventral part.

X 120; courtesy of Y. Nakai) ~ Chemical structure of the mammalian MSH. The mammalian MSH has two forms designated as a- and ,8-MSH. a-MSH has a sequence of 13 amino acids which is identical to that at theN-terminal end of ACTH. However, the N-terminal residue of a-MSH is acetylated. The C-terminal valyl residue of a-MSH is in the amide form. a-MSH is produced by splitting of ACTH. a-MSH has been isolated from the pars intermedias of pigs, cattle, horses, sheep, and monkeys. ,8-MSH is derived from the precursor molecule, ,8-lipotropin.

Pineal organ transfer light dark lighl serotonin catalysis synaptic vesicle NAT hypothalamus suprachiasmatic nucleus N-acetylserotonin l;;~teral hypothalamus melatonin thoracic segment of the spinal cord (intermediolateral nucleus) I Pineal Organ 23 IJ '/'/-b. , and proposed the concept of neurosecretion. This concept was further developed by another pioneering investigator, Bargmann (1949), who examined the transportation of secretory substances produced by the neurosecretory neurons from the hypothalamus to the neurohypophysis.

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