Muscle development in the grasshopper embryo. I. Muscles, nerves, and apodemes in the metathoracic leg.

Much is known about the development of nerve pathways in the metathoracic limb bud of the grasshopper embryo. In this series of three papers, we report on the development of muscles in the same embryonic appendage. In a fourth paper (E. E. Ball, R. K. Ho, and C. S. Goodman, 1985, J. Neurosci, in press) we examine the development of specific neuromuscular connections for one of these muscles (coxal muscle 133a). In this first paper, we present an overview of the development of muscles, nerves, and apodemes (tendons). We previously reported on a class of large mesodermal cells, called muscle pioneers (MPs), that arises early in development and appears to act as a scaffold for developing muscles and guidance cue for motoneuron growth cones (R. K. Ho, E. E. Ball, and C. S. Goodman, 1983, Nature (London) 301, 66-69). We have used the I-5 monoclonal antibody (which specifically labels the MPs as well as the nerve pathways), HRP immunocytochemistry, and Normarski optics to visualize muscle, nerve, and apodeme development in the embryonic metathoracic limb bud from 27.5% (before the appearance of the MPs) to 55% (after the muscles have attained their basic adult pattern). Cell fusions, cell migration, and cell death all appear to play important roles in the development of MPs. The patterns of muscle development vary greatly, ranging from (i) single MPs for simple muscles (which in the adult have only one bundle of muscle fibers, e.g., coxal muscle 133a), to (ii) arrays of MPs for complex muscles [which in the adult have many bundles of muscle fibers each with separate sites of insertion, e.g., the extensor tibiae (ETi) and flexor tibiae (FlTi) muscles in the femur].

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