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Regularities and Irregularities in the Structure of the Seminiferous Epithelium in the Domestic Fowl (Gallus domesticus)
Author(s) -
Tiba T.,
Shimizu Y.,
Kita I.,
Tsubota T.
Publication year - 1993
Publication title -
anatomia, histologia, embryologia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.34
H-Index - 35
eISSN - 1439-0264
pISSN - 0340-2096
DOI - 10.1111/j.1439-0264.1993.tb00363.x
Subject(s) - fowl , rete testis , anatomy , biology , basement membrane , epithelium , spermiogenesis , germ cell , lumen (anatomy) , microbiology and biotechnology , epididymis , genetics , ultrastructure , sperm , ecology , gene
Summary It was investigated in the domestic fowl, whether a mechanism for a synchronous start of the proliferation of the differentiating spermatogonia in a transversely cut seminiferous tubule (called the “co‐ordination” between germ cell association) operates effectively in this species. A trapezoid‐shaped cellular association demarcated by two perpendiculars from the tubular lumen to the basement membrane was the unit of observation (provisionally called a “column” Each column is composed of a bundle of elongate spermatids and the neighbouring, various types of germ cells). The extent of closeness of the co‐ordination was examined in a total of 2,650 columns, based on the continuity of the spermiogenic sptep‐number of the youngest generation of spermatids within adjacent columns. In no case did all columns in a tubular cross section show the same‐step spermatids. In most cases (50.2 % of 2,650 columns), the same number was kept in only 2 to 6 adjacent columns. The arrangement of different but consecutive numbers (e. g., 1–2–3 or 1–2‐1) was observed in a total of 882 columns. The co‐ordination mechanism, therefore, is considered to work, albeit incomplete, among a limited number of adjacent columns in this species.