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The innervation of the salivary gland of the moth, Manduca sexta (1974)

Robertson, H. A.

Springer

Cell & tissue research 148 (1974), S. 237-245

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ISSN: 1432-0878

Keywords: Salivary gland ; Innervation ; Insect ; Monoamines ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The salivary glands of the moth, Manduca sexta (Insecta: Sphingidae), are unlike most other salivary glands in that they are innervated from one source only. Vital staining of nerves with methylene-blue reveals numerous fine nerves extending to the glands from the oesophageal nerve, a part of the stomatogastric or visceral nervous system. Light and electron microscopy confirm that only the fluid-secreting cells, confined to a discrete region in these glands, are innervated. Axons with or without glial wrappings are found in intercellular spaces between fluid-secreting cells. Axons lacking a glial sheath contain, after glutaraldehyde-osmium tetroxide fixation, large granular and small agranular vesicles. In nerve endings in glands fixed with permanganate these smaller vesicles are granular, having the electron-dense cores characteristic of monoamine-containing neurons. These nerve endings with “synaptoid areas” are in close (“direct”) contact with the fluid-secreting cells.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00224585

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The early development of the sheep trophoblast and the involvement of cell death (1985)

Carnegie, J. A. ; McCully, M. E. ; Robertson, H. A.

New York, NY [u.a.] : Wiley-Blackwell

American Journal of Anatomy 174 (1985), S. 471-488

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ISSN: 0002-9106

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Medicine

Notes: During the period of rapid elongation prior to the initiation of placental attachment (days 12-16 of gestation), the ovine blastocyst consists of a single layer (primarily) of roughly cuboidal trophoblastic cells with an inner lining of flattened endodermal cells. Well-developed spot desmosomes link the adjacent cell borders in both the trophoblastic and endodermal layers. The trophoblastic cells contain acid phosphatase-positive, lysosomelike organelles, the mean diameter of which increases greatly between days 12 and 16 and whose contents vary during development. Also during the developmental period studied, trophoblast cells accumulate lipid; and periodic acid-Schiff-positive binucleate cells appear within the trophoblast layer. A consistent observation throughout the 5 days of rapid growth and differentiation of the blastocyst was the death and disintegration of some trophoblast cells. These disintegrating cells are usually singly dispersed within the trophoblast, although occasionally groups of four or five are observed. The cell death may indicate overall remodelling of the blastocyst, or the cells may represent genetically deficient cells which are unable to respond to the appropriate signal to differentiate.

Additional Material: 32 Ill.