Editing Ear (section)

== External acoustic meatus ==

* Divisions
** Lateral third      (cartilaginous)
** Inner two-thirds (bony)
* Runs from outer ear to middle     ear (pinna to tympanic membrane) which is about 4cm
* The junction between     cartilaginous and bony parts is about 10-12mm from the tragus and is     lateral to the plane of emergence of the facial nerve
* 'Tragal pointer': a small     cartilaginous extension of the external portion of the acoustic canal, at     the junction with the bony canal, is usually found which seems to point to     the facial nerve - about 1cm inferior and 1cm medial to its' tip
* The part of the bony meatus     running inferiorly is called the tympanic plate, and the tympanomastoid     suture line is found where this joins the mastoid process. This is usually     5-10mm immediately lateral to the facial nerve.




[[Category:Anatomy]]