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Polyneural innervation in the psoas muscle of the developing rat

✍ Scribed by Jos Ijkema-Paassen; Albert Gramsbergen

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 181 KB
Volume: 21
Category: Article
ISSN: 0148-639X
DOI: 10.1002/(sici)1097-4598(199808)21:8<1058::aid-mus10>3.0.co;2-q

No coin nor oath required. For personal study only.

✦ Synopsis

Polyneural innervation was studied in the psoas muscle in developing rats from P4 till P25 and at adult age, with the combined silveracetylcholinesterase technique. Nerve endings were counted, and endplates were measured. These data were compared with such data in the human. The end of polyneural innervation in the rat (around P20) and in the human (around 12 weeks postterm age) in both cases coincides with a transformation in motor behavior and postural control. The rat's psoas muscle at early stages is less heavily innervated than this muscle in the human. Up to three axons per motor end-plate were counted at P4, but in the human up to five axons at 25 weeks of post menstrual age. This difference might be related to the lower percentage of type I muscle fibers in the rat.

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