Abstract
Electron microscopic observations were made on muscle and peripheral nerve of human embryos of the period between the 9th and 16th week. These observations showed the presence of motor end-plates at the 10th week of human embryonic life, at a time when the muscle cells were still in the myotube stage. The difference between the structure of nerve fibres of the 9th and those of the 16th week of foetal life consisted in a change from the form of one multiaxon bundle to single axons separated from each other by an intracellular space filled with collagen fibres.
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