The location and morphology of the ultimobranchial gland in medaka, Oryzias latipes

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The location and morphology of the ultimobranchial gland in medaka Oryzias latipes were examined. The ultimobranchial gland was found in the tissue of the thin transverse septum which separates the pericardial cavity from the abdominal cavity, thus in close association with the cardio-vascular system. In the anterior part of the body, the ultimobranchial tissue begins from where the hepatic vein joins the sinus venosus. After that, the ultimobranchial gland is elongated upwards and attached to the left and right Cuvierian ducts, in a sheet-like way. The ultimobranchial gland looks Y-shaped. In the posterior part of the body, the ultimobranchial gland ends at the same level as the head kidney.

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