The dorsal fin may act as a keel. It probebly helps stabilize a dolphin as it swims, but is not necessarily essential to a dolphin's balance. As in the flukes and the flippers, arteries in the dorsal fin are surrounded by veins to help conserve body in cold water. It is located at the center of the back. H. HEAD 1.
Teeth are conical and interlocking.
They are desinged for grasping food not chewing. The number of teeth varies considerablyamong individuals. Most individuals have 20 to 25 teeth on each side of the upper jaw and 18 to 25 teeth on the side of the lower jaw, a total of 76 to 98 teeth. Eyes are on the sides of the head, near the corners of the mouth. Glands at the inner corners of the eye sockets secrete an oily, jellylike mucus that lubricates the eyes, washes away, debris, and probably helps stream line a dolphin's eye as it swims.