Lateral scutes are smaller than the dorsal and ventral scutes. Hippocampal commissures have dorsal and ventral segments. The intermediate hippocampus has overlapping characteristics with both the ventral and dorsal hippocampus. Peritoneal folds develop from the ventral and dorsal mesentery of the embryo. The otic vesicles then form ventral and dorsal components. Foreskin piercing passes through the penile prepuce on the dorsal, ventral or lateral side. The exoskeleton of the abdomen is divided into plates called dorsal tergites and ventral sternites. Pancreatic development begins with the formation of a dorsal and ventral pancreatic bud. The rostrum is conical and contains numerous sensory pits on both ventral and dorsal surfaces. They are called the ventral and dorsal respiratory groups respectively. The tongue can also divide itself in dorsal and ventral surface. The ventral and dorsal side of the seed are flat. They have downward-facing mouths, deep bodies, and tails with broad dorsal and ventral fins. These axons also synapse with lower motor neurons in the ventral horns. Nicotine can modulate the firing rate of the ventral tegmental area neurons.