Inhalant and exhalant neck lobes present in neck region. The water then emerges through the exhalant siphon. There is an inhalant or incurrent siphon, and an exhalant or excurrent siphon. Water is inhaled through an inhalant siphon, and exhaled through an exhalant siphon. It has large inhalant and exhalant siphons with slightly scalloped edges, usually set close together. The exhalant current exits at the hinge.