Download The Human Adrenal Cortex: Pathology and Biology — An by A. Munro Neville PhD, MD, MRCPath, Michael J. O’Hare MA, PhD PDF
By A. Munro Neville PhD, MD, MRCPath, Michael J. O’Hare MA, PhD (auth.)
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Sample text
Cells at the boundary with the definitive zone show closely apposed membranes but in the inner part of the gland they possess numerous interdigitating microvilli ; specialised junctional complexes are, however, rare. Electron microscopy reveals a transitional zone between the definitive and fetal zones. In this area, the cells have mitochondria of the fetal zone type but the SER and RER are less abundant (McNutt and Jones 1970). These observations emphasise the continuity of cortical zonation in the fetus, and illustrate the precocious structural differentiation of the fetal zone as compared with the definitive cortex at all stages of gestation.
1957a). In most large mammals rates of up to 5 ml/min/g have been measured (Wright 1963); the maximum rate of blood flow through each human gland may reach 10 ml/min, a flow rate approached only by the thyroid gland. Lymphatic Supply The best available evidence (Merklin 1966) indicates that adrenal lymphatics are confined for the most part to the capsule of the gland, lying beneath an extensive subserous network in the periadrenal loose connective tissue in which pairs of lymphatic vessels tend to be associated with a small artery and a vein (Feyrter and Holczabek 1978b).
70) content. Extraction of the lipid during preparation of typical paraffin-embedded sections results in the cells of the zona fasciculata having a vacuolated appearance. Hence the term 'clear cells' as used by Symington (1969) and the older 'spongiocytes' (Guieysse 1901) still used in the French and German literature. The clear cells of the zona fasciculata are arranged in radially disposed columns extending from the zona glomerulosa or, where the latter is absent, from the connective tissue capsule to the zona reticularis (Fig.