Intersegmental nerve of larval segments A1-A7. After branching from the segmental nerve at the ventral edge of the ventral oblique muscles, this intersegmental nerve runs dorsally, anterior to the segmental nerve. Its branches include (from ventral to dorsal): two motor branches- ISNb and ISNd, which innervate the ventral oblique and ventral muscle fibers; and a sensory branch that penetrates the lateral transverse fibers to reach the lateral sensory cluster. Upon entering the dorsal muscle group, it splits to form an externally directed sensory branch connected to the dorsal sensory cluster, and an internally directed branch which carries efferent axons to the dorsal musculature.