Lateral scutes are smaller than the dorsal and ventral scutes. Hippocampal commissures have dorsal and ventral segments. Foreskin piercing passes through the penile prepuce on the dorsal, ventral or lateral side. Pancreatic development begins with the formation of a dorsal and ventral pancreatic bud. Dorsal root ganglion neurons differentiate from neural crest progenitors. Early in development they are dorsiventrally flattened with both dorsal and ventral surfaces. They have downward-facing mouths, deep bodies, and tails with broad dorsal and ventral fins. The ventral bud rotates to lie next to the dorsal bud, eventually fusing. Its action is to draw the scapula to the dorsal and caudal region. It moves by combining pectoral, dorsal, anal, and caudal fins. The illicium is the detached and modified first three spines of the anterior dorsal fin. There are spots on the head, dorsal, anal, and caudal fins. The axons of dorsal root ganglion neurons are known as afferents. They also have long dorsal and pelvic spines. Na1.7 channels are expressed at high levels in nociceptive neurons of the dorsal root ganglia.