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ANATOMY & DEVELOPMENT OF EXTERNAL EAR

ANATOMY & DEVELOPMENT OF EXTERNAL EAR

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ANATOMY & DEVELOPMENT OF EXTERNAL EAR

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  1. DEVELOPMENT OF THE EXTERNAL EAR

  2. DEVELOPMENT OF EXTERNAL EAR

  3. COLLAURAL FISTULA

  4. DEVELOPMENT OF EXTERNAL EAR SUMMARY

  5. ANATOMY OF THE EXTERNAL EAR

  6. Auricle is bounded laterally by elevated rim like prominence called the Helix. • Anteriorly the helix bends inferiorly and posteriorly to enter over the pinna as the Crus Helix. • The boat shaped depression above the crus helix on the lateral aspect of pinna is called Cymba conchae and below the crus is called Cavum conchae. • Just anterior to Helix one can see another elevation which divide above as Supra Crura Antihelix (upper crus) and Infra Crura Antihelix (lower curs), Thus an area of depression is formed in between , called Triangular fossa . • Another area which is between the supra crura Antihelix and the Helix is known as Scaphoid fossa. • The Cavum conchae medially enter into the lumen of External Auditory canal (External Acoustic meatus). • The Tragus is a separate elevation in front of External Acoustic meatus and is formed by a separate cartilage , covered by skin. • The space between the Crus Helix and the superior end of Tragus is called Incisura terminalis ,which is devoid of cartilage.

  7. LYMPHATIC DRAINAGE OF PINNA The lymphatic drainage from the posterior surface is to the lymph nodes at the mastoid tip, from the tragus and from the upper part of the anterior surface to the preauricular nodes, and from the rest of the auricle to the upper deep cervical nodes.

  8. It lies obliquely because roof and posterior wall of external auditory canal shorter than the floor and anterior wall.

  9. It forms due to the light of the otoscope that strikes the tympanic membrane, antero-inferior quadrant of which is at an angle of 550 to the inferior part of external auditory canal.

  10. ARTERIA NUTRICIA INCUDOMALLEA, a twig from MIDDLE MENINGEAL ARTERY, also supplies the inner surface of the tympanic membrane.

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