vocal sac

▪ amphibian anatomy
  the sound-resonating throat pouch of male frogs (frog) and toads (toad) (amphibians (amphibian) of the order Anura). Vocal sacs are outpocketings of the floor of the mouth, or buccal cavity. Frogs display three basic types of vocal sacs: a single median throat sac, paired throat sacs, and paired lateral sacs. (Lateral sacs are located just rearward of the angle of the jaw on each side of the head.) All three types, whether single or paired, open into the buccal cavity by paired slits. Each slit is located on either side of the base of the tongue.

      A calling frog typically inflates his sac or sacs prior to calling or simultaneously with the production of the first call. The sac is inflated with air from the lungs (lung). If another call is forthcoming and the male frog is not in the process of calling, air is still held in the sac. Sound is produced by a controlled rush of air through the larynx and across its vocal cords (vocal cord). The resulting sound vibrations are amplified by the resonating qualities of the vocal sac or sacs. Unlike vocalization processes of many other vertebrates (vertebrate), frogs broadcast sound without expelling air. Air does not exit the mouth; rather, it cycles back and forth between the buccal cavity and lungs.

George R. Zug

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Universalium. 2010.

Look at other dictionaries:

  • Vocal sac — The vocal sac is the flexible membrane of skin possessed by most male frogs. The purpose of the vocal sac is usually as an amplification of their mating or advertisement call. The presence or development of the vocal sac is one way of externally… …   Wikipedia

  • vocal sac — noun also vocal pouch : one of a pair of inflatable resonating sacs in the mouth of various frogs; also : the unpaired sac in the true toads of the genus Bufo …   Useful english dictionary

  • vocal sac — noun The flexible membrane of skin possessed by most male frogs …   Wiktionary

  • vocal pouch — noun see vocal sac …   Useful english dictionary

  • Sac vocal — (Litoria chloris). Le sac vocal est un sac gulaire destiner à amplifier les sons par la formation d une caisse de résonance. Cet organe constitué de la membrane souple de peau extensible est présent chez les mâles de la plupart des anoures mâles …   Wikipédia en Français

  • Vocal fold cyst — Vocal fold cysts are collections of fluid in sac like formations on the vocal folds.Cysts can deteriorate the quality of human speech production, causing diplophonia, a condition where the vocal cords produce multiple tones at the same time, or… …   Wikipedia

  • Sac gulaire — d une Frégate superbe Le sac gulaire est une poche membraneuse dilatable visible sur la gorge de certaines espèces comme les pélicans, les marabouts et les frégates. Leur utilisation dépend de l espèce, ceux utilisés pour amplifier les sons sont… …   Wikipédia en Français

  • sac — 1. sac [ sak ] n. m. • 1050 « étoffe grossière »; lat. saccus, gr. sakkos, d o. sémitique I ♦ A ♦ 1 ♦ (1120) Contenant formé d une matière souple pliée, assemblée, et ouvert seulement par le haut. ⇒ 1. poche. Grand, petit sac (⇒ sachet) . Sac… …   Encyclopédie Universelle

  • Vocal folds — Infobox Anatomy Name = Vocal folds Latin = plica vocalis GraySubject = 236 GrayPage = 1079 Caption = Laryngoscopic view of the vocal folds. Caption2 = Abduction and adduction Precursor = |Sixth pharyngeal arch System = Artery = Vein = Nerve = |N …   Wikipedia

  • croaking sac — noun : vocal sac …   Useful english dictionary

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