An Electron Microscopic Study of the Ultimobranchial Body of the Crucian Carp (CARASSIUS CARASSIUS)

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  • Takagi Isamu
    Department of Anatomy, Fujita-Gakuen University School of Medical Technology and Nursing
  • Yamada Keiki
    Department of Anatomy, Fujita-Gakuen University School of Medical Technology and Nursing

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  • Electron Microscopic Study of the Ultim

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As a study in comparative anatomy an electron microscopic study of the ultimobranchial body of the crucian carp, one of teleostei, was conducted and the following results were obtained:<BR>1. The ultimobranchial body of the crucian c a rp forms a lobule which has a follicular or cord-like arrangement and is enclosed by abundant fibrillar connective tissues and blood capillaries.<BR>2. A follicle measures 30 to 55 μ and a num b er of microvilli are projecting into the follicular lumen. Some cell detritus can be observed within the lumen.<BR>3. A follicle generally consists of three kinds of cells: light cells, semi-dark cells, and dark cells.<BR>4. Both cytoplasm and nucleus of the light cells have circular to elliptical shapes. Within the cytoplasm, which appears heterogeneous, thin rough-surfaced endoplasmic reticulum are scattered about and granules of 0.2 to 0.3 μ of varying shades can be found. The Golgi apparatus often shows a figure indicating a possible production of the granules.<BR>5. The dark cells penetrate deeply into the gaps between the light cells and also enclose the follicular lumen. The nucleus and cytoplasm of these dark cells are irregularly shaped and the nucleus occupies most of the cytoplasm. Occasionally, granules measuring 0.5 to 1.0 μ can be found in the cytoplasm of the dark cells. Cellular interdigitations and desmosomes are commonly found at the apical border of the dark cells.<BR>6. The semi-dark cells have a number of similarities to the light cells. But they possess more cytoplasmic granules than the light cells.<BR>7. Some of the cells adjacent to the basal borderbeing differ e nt from the above-mentioned three kinds of cellspossess a large number of granules measuring 0.2 to 0.4 μ. A nucleolus is extremely distinct and rough-surfaced endoplasmic reticulum and mitochondria also have clear shapes. The cells show a great similarity to parafollicular cells of the mammals.

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