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Humans do have weak vestigial muscles attached to the shell of the ear, called the auricle or pinna, as well as evidence of a vestigial nervous system, which could have functioned to orient the ears.

Between the auricle and ventricle is the auriculo-ventricular valve, which primarily consists of two cusps, comparable to the two endocardial cushions of the human embryo, though in some forms they may be subdivided.

Mostly stiff, with short erect closely flowered spikes, an entirely staminate terminal spike, dark colored scales, and bracts with purple or black auricles at base; stigmas 2 or 3.—Sp.

Even after twelve hours both auricles responded to the same stimulus, though the ventricles remained motionless.

Having two auricles, as the heart of mammals, birds, and reptiles.