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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructure of the nucleus of human sertoli cells in normal and pathological testes (1974)
    Springer
    Cell & tissue research 152 (1974), S. 467-475 
    Details
    ISSN: 1432-0878
    Keywords: Sertoli cell ; Human testis ; Nucleolus ; Nuclear bodies ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the nucleus of human Sertoli cells has been studied in testicular samples from normal adults and patients with hypospermatogenesis or absence of the germinal cell line (Sertoli cell only syndrome). In all cases the ultrastructure of the nuclear structures was alike. The nucleus is irregularly shaped and its membrane presents numerous pores. The inner aspect of the nuclear membrane is electron dense due to the presence of a fibrous lamina. The outer aspect presents a concentric arrangement of 50 Å cytoplasmic filaments. The chromatin is rather dispersed. Some perichromatin granules are found occasionally. The nucleolus is characteristic of human Sertoli cells and displays three clear components. In addition, sphaeridia of at least two principal morphological types were found. Their significance in the cell metabolism as well as relationship to either the nucleolus or the nuclear DNA are discussed. The need for further investigation on the functional meaning of the nuclear organelles of human Sertoli cells is stressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218932
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  • 2
    Electronic Resource
    Electronic Resource
    The rete testis in man: Ultrastructural aspects (1976)
    Springer
    Cell & tissue research 175 (1976), S. 1-15 
    Details
    ISSN: 1432-0878
    Keywords: Rete testis ; Human ; Epithelial cell types ; Smooth muscle cells ; Histophysiology ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the normal human rete testis was analyzed. The rete testis cavities are irregularly shaped and contain virtually no spermatozoa. Smooth muscle cells often surround the cavities. In the epithelial lining, two cell types are distinguishable. Flat, dark cells exhibit numerous slender microvilli, and numerous apical and basal microvesicles. Prismatic, lighter cells have more cell organelles, mostly polarized towards a supranuclear position. Both cell types contain variable amounts of glycogen and fat, and an occasional cilium. All cells display intricate lateral cell surfaces that possess different cell-to-cell attachment devices. Intermediate cell types are frequently found. On a morphological basis, the epithelial cells seem to be involved in the release of substances into the lumen and probably also in transport towards the base. Connective tissue elements are found subjacent to the epithelium. Scattered among the fibrocytes are typical smooth muscle cells. Expansions of some smooth muscle cells are connected to the epithelial basement membrane by a network of microfibrillar material. The smooth muscle cells may be involved in changing the shape of the rete testis channels, thus promoting the flux of the rete testis fluid. Different types of nerve fibre bundles are distinguished in the connective tissue of the rete testis which may correspond to autonomic and sensory nerves or sensory receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220819
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  • 3
    Electronic Resource
    Electronic Resource
    On structural patterns of the lamina propria of human seminiferous tubules (1973)
    Springer
    Cell & tissue research 141 (1973), S. 413-425 
    Details
    ISSN: 1432-0878
    Keywords: Seminiferous tubules, human ; Lamina propria ; Contractile cells ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the lamina propria of human seminiferous tubules was analyzed in normal specimens and compared to biopsies showing great thickenning of this area in light microscopy. The contractile cells are stellate in shape, the intercellular gaps between their branchings being less than 150 Å. The cytoplasmic features of these cells are similar to those described by Ross and Long (1966) and do not differ significantly in the pathological cases examined. The intercellular components, namely collagen fibers, microfibrils and an incomplete basement membrane-like coating of the contractile cells, are strikingly increased in the thickenned lamina propria, although the number of layers making up this structure needs not be increased. Occasionally, the intercellular space is occupied by only one of these materials. The distribution of collagen permits identification of two main patterns in the thickenned lamina propria: a) one where the basement membrane of the seminiferous epithelium is separated from the first layer of contractile cells by a wide collagen zone, and b) another case where the layer displaying greater thickness because of increased collagen deposition is located further away from the germinal epithelium. The functional activity of the contractile cells, the physiological implication of structural alterations of the lamina propria and the necessity to correlate these observations to andrological findings, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307414
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructure of the lamina propria in the ovine seminiferous tubule (1974)
    Springer
    Cell & tissue research 150 (1974), S. 481-492 
    Details
    ISSN: 1432-0878
    Keywords: Seminiferous tubule, ovine ; Lamina propria ; Development ; Endocrine factors ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the lamina propria in the ovine seminiferous tubule was studied from 54 days (postcoitum) fetuses up to sexual maturity. In young animals (aged about two months) the effect of hypophysectomy and/or hormones was also analyzed. Initially, large areas of the lamina propria already show signs of morphological differentiation. The non cellular component is a single or sometimes double lamella. Outwardly, the cellular component is represented by rounded connective tissue cells or by elongated cells, exhibiting 80 Å filaments in the cytoplasm and arranged in 3 to 4 layers. By the first week after birth, the non cellular component is formed by 8 to 10 lamellae and the cellular component shows typical contractile cells, the fibroblasts being now located only in the periphery. Basically, the same aspect is found in the adult ram, thus differing from the more extensively studied prototypes of lamina propria architecture of rodents or primates. In as much as the sheep lamina propria differentiates precociously, probably induced by fetal testicular hormones, it is relatively insensitive to hypophysectomy or hormonal substitution. Hypophysectomy and cyproterone acetate administration cause intracytoplasmic lipid deposition in the contractile cells, the other components being not changed. Some questions are raised concerning the role of this peculiar lamina propria in the function of the blood-testis barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225971
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