. Animal hormones; a comparative survey. Hormones. 32 SOURCES OF KINETIC AND METABOLIC HORMONES Storage of the neurosecretion from the brain in the corpora cardiaca has been conclusively shown in the cockroach, Leuco- phaea, where the system is paired (B. Scharrer, 1952). Unilateral section of the axons from the median neurosecretory cells results (a) Corpus cardiacum (b) Corpus allatum Fig. 2-9. Sections of parts of {a) the corpus cardiacum of a beetle, Hydrous piceus (after de Lerma, 1956), and (b) the corpus allatum of a grasshopper, Melanoplus differentialis (after Mendes, 1948). Axo
. Animal hormones; a comparative survey. Hormones. 32 SOURCES OF KINETIC AND METABOLIC HORMONES Storage of the neurosecretion from the brain in the corpora cardiaca has been conclusively shown in the cockroach, Leuco- phaea, where the system is paired (B. Scharrer, 1952). Unilateral section of the axons from the median neurosecretory cells results (a) Corpus cardiacum (b) Corpus allatum Fig. 2-9. Sections of parts of {a) the corpus cardiacum of a beetle, Hydrous piceus (after de Lerma, 1956), and (b) the corpus allatum of a grasshopper, Melanoplus differentialis (after Mendes, 1948). Axons () from neurosecretory cells in the brain carry granules; some end in swellings (), like Herring bodies, and release masses of neurosecretion (ns) in the corpus cardiacum. Cells in different phases of secretion (sc and sc') release masses of granules (mg) that stain with phloxin, and may be the intrinsic secretion of the organ. Tracheoles (t) and non-secreting nerve cells (en) also occur. Other axons () pass to the cells of the corpus allatum, where their granules disappear. It has undifferentiated cells (uc), secreting (sc") and giant secreting cells with polyploid nuclei (gsc); acidophil granules pass with some fluid into intracellular vacuoles and are then extruded (v). in the depletion of all stainable secretion from the corpus cardia- cum of that side. At the same time, increased quantities of the secretion appear in the axons proximal to the cut (Fig. 3-2). The corpora cardiaca are nearly always fused with the dorsal blood vessel or aorta, into which they presumably pass the stored secre- tion as required (Hanstrom, 1940).. 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 Jenkin, Penelope M. Oxford, New York, Pergamon Press
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjecthormones
