27 : The Larynx and the Ear

The external auditory meatus

Extends from the concha to the tymphatic membrane.
It is sigmoid.
Lateral 1/3 is cartilaginous, whereas the medial 2/3 is bony. It is almost entirely cartilaginous in the infant.

Arteries	Veins	Lymphatics	Innervation

Posterior auricular artery, from the external carotid artery Deep auricular branch of the maxillary artery Auricular branches of the superficial temporal artery	Posterior auricular vein Deep auricular Superficial temporal vein Drain to external jugular and pterygoid venous plexus.	Superficial parotid lymph nodes Retro auricular lymph nodes Deep cervical lymph nodes Superficial cervical nodes	Posterior wall and floor: Auricular branch of vagus (with contribution from the glossopharyngeal and facial) . Anterior wall and roof: Auriculotemporal branch of Mandibular nerve.