Posture and pressure within the internal jugular vein.
D000328:Adult; D001794:Blood Pressure; D002404:Catheterization; D004432:Ear, Middle / Q000098:blood supply; D005064:Eustachian Tube / Q000098:blood supply; D006801:Humans; D007601:Jugular Veins / Q000502:physiology*; D008297:Male; D008365:Manometry; D008875:Middle Aged; D009297:Nasal Mucosa / Q000098:blood supply; D009333:Neck / Q000098:blood supply; D011187:Posture; D014159:Transducers