embryonic/larval hypodermal muscle cell muscle cell of A1-7 ventral longitudinal muscle 3 muscle cell of A1-7 ventral longitudinal muscle 4 obsolete abdominal ventral internal muscle true FBbt:00000635 This term comes from Crossley's classification of larval hypodermal muscles (Crossley, 1978, Ashburner, Wright, 1978-1980 b: 499--560). This partially classifies on the basis of whether a muscle is in a layer immediately below the epidermis (external) or under another layer of hypodermal muscle (internal). This system is now little used and was only every very partially implemented in this ontology. Mappings for specific internal and external muscle classes to the modern nomenclature (Bate, 1993, Bate, Martinez Arias, 1993: 1013--1090; Campos-Ortega and Hartenstein, 1997, The embryonic development of Drosophila melanogaster. 2nd ed.) can be found as synonyms for the relevant terms. The most likely replacements for this term are abdominal ventral longitudinal muscles 3 & 4. VI fly_anatomy.ontology