AUDITORY TUBE/EUSTACHIAN TUBE -ANATOMY,ARTERIAL SUPPLY/NERVE SUPPLY

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 AUDITORY TUBE /EUSTACHIAN TUBE

  • Shape: Trumpet
  • Length: 4 cm
  • Connect : middle ear cavity with nasopharynx

BONY PART 

  • Length: 12 mm
  • Situation: Petrous temporal
  • Form: posterior and lateral one third





RELATION:

  • Superior- Tensor tympani
  • Medial- Carotid canal
  • Lateral- Chorda tympani







CARTLAGINOUS PART :

  • Length-25 mm
  • Situation-Sulcus tubae
  • Form: anterior and medial two third

RELATION:

  • ANTERIOLATERALLY: Mandibular nerve and its branches
  • POSTEROMEDIALLY : Petrous temporal 

ARTERIAL SUPPLY:

  • Ascending pharyngeal ,middle meningeal artery 




NERVE SUPPLY:

  • Maxillary nerve
  • Mandibular nerve- cartilaginous part 
  • Pharyngeal -bony part

FUNCTION:

  • Communicate middle ear cavity to external : equal air pressure on both side of tympanic membrane
  • Tube usually closed :opens during- swallowing, yawning





APPLIED ANATOMY:

  • Infection may pass from throat to middle ear
  • Inflammation of tube ,second attack of common cold, sore throat .




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