part_of part of part of connected to connected to submucosa appendage head external ectoderm mucosa musculature of body thoracic segment of trunk heart brain lens of camera-type eye musculature nervous system pelvic girdle region pectoral girdle region skeletal system bone element muscle organ anterior segment of eyeball posterior segment of eyeball midbrain hindbrain vasculature trunk spinal cord neurectoderm muscle tissue abdominal segment of trunk gland cranium skeleton of lower jaw neural tissue skeleton pectoral appendage skeleton pelvic appendage skeleton pectoral complex pelvic complex