Human Ear Short Question And Answers

Give the position, nerve supply & development of tympanic membrane
Answer:

Tympanic Membrane:

Tympanic Membrane Position:

• It is placed obliquely at an angle of 55 degrees with the floor of the meatus
• It faces downwards, forwards & laterally

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Tympanic Membrane Nerve supply:

1. Outer surface

• Anterinferior part
  • Supplied by the auriculotemporal nerve

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• Posterosuperior part
  • Supplied by the auricular branch of the vagus nerve with a communicating branch from facial nerve
• Inner surface
  • Supplied by the tympanic branch of the glossopharyngeal nerve through tympanic plexus

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Tympanic Membrane Development:

The tympanic membrane has outer & inner surfaces

• The outer surface of the membrane is lined by thin skin & is concave
• The inner surface provides attachment to the handle of the mallets, which extends up to its center & is
  convex
• The point of maximum convexity lies at the tipoff the handle of the malleus & is called the “umbo”
• The membrane is thickened at its circumference, which is fixed to the tympanic sulcus of the temporal bone on the tympanic plate
• Superiorly, the sulcus is deficient & the membrane is attached to the tympanic notch
• From the ends of the notch two bands, the anterior & posterior malleolar folds are prolonged to the lateral process of the malleus
• The greater part of the tympanic membrane is tightly stretched & is called “pars tense”
• The part between the two malleolar folds is loose & is called “pars flaccid”

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