Key result
Physiological properties of motor units in the axolotl hindlimb are continuously distributed rather than grouped into discrete types, with overlap positively correlated with motor unit size.
Key points are not available for this paper at this time.
Answers are grounded in this paper and cite their sources.
Motor unit properties distribute continuously in axolotl; leaves open discrete classification in vertebrates and requires mammalian validation.
The characteristics of motor units in the iliotibialis posterior muscle of the axolotl hindlimb are described. Tension recording and intracellular electrophysiological methods demonstrate that the physiological properties of the population of motor units are continuously distributed rather than grouped into a series of discrete types. Overlap between motor units occurs and this is positively correlated with motor unit size but negatively correlated with differences in time to peak tension. Immunocytochemical staining with antimyosin antibodies combined with histochemical demonstration of actomyosin ATPase activity revealed at least four types of muscle fibre which were distributed asymmetrically within iliotibialis posterior. The results are discussed in terms of the continuous growth of the muscle and the interactions between muscle and nerve in the formation of the axolotl motor system.
No takes yet. Share an insight, caveat, or question.
Bewick et al. (1991) studied this question. Physiological properties of motor units in the axolotl hindlimb are continuously distributed rather than grouped into discrete types, with overlap positively correlated with motor unit size.
Synapse has enriched 10 related papers. Consider them for comparative context: