Abstract：
:The primary musculature of Sagitta is mainly made up of two kinds of alternating fibers, A and B. These fibers differ markedly in their localization in the muscular tissue, by the development of their SR and their mitochondria, and the shape of their myofibrils. Their contractile apparatus is similar and possesses myofibrils of regular thickness with very short I bands, flanked by invaginations which are large compartments communicating with the extracellular space. This fiber diversity appears and is maintained in the presence of an apparent common innervation. Nerve ending-like structures are scattered in the epidermis against the basement membrane and there are no nerve beneath this. The presence of at least two kinds of fibers in the primary musculature and the presence of the secondary musculature would suggest that the displacements of sagitta may be more complex than is generally admitted. The specializations of the trunk musculature underline the degree of specialization in the Chaetognatha phylum.
journal_name
Tissue Celljournal_title
Tissue & cellauthors
Duvert M,Salat Cdoi
10.1016/0040-8166(80)90025-7subject
Has Abstractpub_date
1980-01-01 00:00:00pages
723-38issue
4eissn
0040-8166issn
1532-3072journal_volume
12pub_type
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