Summary
The ultrastructure of the developing chicken liver has been reexamined on specimens fixed by perfusion with glutaraldehyde. This fixation technique gives a preservation of ultrastructural detail superior to that of earlier investigations. Among others the following observations may be pointed out:
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1.
Bile canaliculi with well-developed microvilli and adjacent tight junctions are present already at the 4-day-old stage and then remain essentially unchanged during development.
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2.
A subendothelial space of Disse is not present until about 16 days of incubation.
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3.
The Golgi apparatus does not assume its adult appearance until about 8 days of incubation.
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4.
Glycogen is first observed in the 6-day-old specimens and then continuously increases throughout development. Glycogen particles often accumulate in membranelimited bodies reminding of the glycogen-filled lysosomes found in a certain type of glycogenosis (Pompe's disease).
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5.
The mitochondria increase in size and number during development with a conspicuous change from rounded towards more rodshaped and elongated forms.
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Sandström, B., Westman, J. Ultrastructure of the developing chicken liver before hatching. Z. Zellforsch. 117, 516–525 (1971). https://doi.org/10.1007/BF00330712
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DOI: https://doi.org/10.1007/BF00330712