larval abdominal segmental nerve obsolete larval segmental nerve of A1-7 2008-11-19T02:20:06Z https://github.com/FlyBase/drosophila-anatomy-developmental-ontology/issues/1565 true Obsoleted as this is the same as 'larval abdominal segmental nerve' (no 'intersegmental' and 'segmental' nerves in A8-9). Larval segmental nerve of segments A1-7. It has two roots, anterior and posterior, both formed from neurons of the same segment as the nerve (Campos-Ortega and Hartenstein, 1997). Proximally it shares a glial sheath with the intersegmental nerve before branching from it at the ventral edge of the ventral oblique muscles (Campos-Ortega and Hartenstein, 1997). A thick, posteriorly directed branch (SNc) leaves the main trunk of the nerve (SNa) and splits into fine branches - 3 carrying axons from the ventral sensory cluster and a 4th carrying efferents to the ventral acute musculature (Campos-Ortega and Hartenstein, 1997). The SNa branch continues dorsally and carries efferent axons innervating the external lateral transverse and lateral oblique muscles and the axons of v'es2 and v'ch1 (Campos-Ortega and Hartenstein, 1997). SN fly_anatomy.ontology FBbt:00007315