Pharynx

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Pharynx

• The pharynx is a part of digestive tract
  exhibiting pharyngeal pouches.
• Fish Pharynx is respiratory organ.
• Tetrapods The pharynx is a part of the foregut
  preceeding the esophagus includes
• Glottis (slit leading into the larynx.
• Openings of auditory (eustachian) tubes.
• Opening into esophagus .
• Mammals An epiglottis is positioned over the
  glottis so that, when a mammal swallows, the
  larynx is drawn forward against the epiglottis
  the epiglottis blocks the glottis (which prevents
  food or liquids from entering the trachea .
• In mammals, two sets of muscles tie just external
  to the pharynx, internal and some attaches to all
  the bones of the hyoid apparatus
• A series of longitudinal muscles which suspend
  the pharynx from the base of the skull and act to
  pull the pharynx up during swallowing.
• A series of circular muscles, called the
  constrictors, serve to squeeze the pharynx.
  Typically, there are three constrictors a
  superior, middle and inferior.

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