Anatomical structures visible on cine magnetic resonance imaging (a) nasal cavity, (b) nasopharynx, (c) tongue, (d) lips, (e) incisors, (f) floor of the mouth, (g) hyoid bone, (h) symphysis, (i) pharynx, (j) larynx, (k) spinal column, (l) spinal cord, (m) epiglottis, (n) cricoid cartilage and cricotracheal membrane, (o) trachea, and (p) upper portion of the esophagus.