THYROID-STIMULATING HORMONE LOCATION IN THE CHICKEN PARS DISTALIS

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Abstract
Several authors have recognized the regional distinctiveness of cellular types in the fowl pars distalis (see review Mikami, 1958). Recently Mikami (1958) and Brasch & Betz (1971) have attempted to correlate hormone content with cell types in the chicken. Mikami (1958) divided the pars distalis into a cephalic and a caudal portion and assayed thyroid-stimulating hormone (TSH) in day-old chicks by thyroid gland weight and cell height. The cephalic lobes produced considerably heavier thyroids in the chicks whether one or two cephalic lobes were used as opposed to chicks injected with caudal lobes. Cell height showed less distinct contrasts. Brasch & Betz (1971) transplanted cephalic, middle or caudal portions of the pars distalis on to the chorioallantoic membrane of 10-day-old partially decapitated embryos. Bioassay for TSH was based on the amount of thyroidal colloid present and the height of the thyroid epithelial cells. The cephalic and middle pars distalis transplants

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