in this video we will learn about the ear anatomy
external and middle ear so here is the ear we can see the external ear let us learn about the
innervation of the external ear
first so here we have the auricle there are many nerves innervating the external ear aspect of the ear and these are your auricular
-temporal branch of the mandibular nerve v3 which is a branch of the trigeminal nerve cranial nerve 5 .
– other part are supplied by the lessor occipital nerve from which
originates from the c2 spinal cord and the greater auricular nerve which is from the c2 and c3 spinal branches .
-ocular branches of the facial and vagus nerves recapping on the external acoustic meatus the lateral so the outer 2/3 of the external acoustic meatus is mainly car as made mainly made up of cartilage or surrounded by college whereas the medial.
1/3 is bone the external acoustic meatus does not follow a straight line as as well so you must pull the ear a certain way in order to examine the external ear properly so looking at some clinical relevance here swimmers ear also known as otitis externa is an inflammation of the external acoustic meatus clinical sign is pulling on the tragus elicits pain the tragus what I’m talking about is this part of the auricle and another important anatomical part of the auricle is the helix here there is also another condition of the external ear known as surfers ear which which is where there is a development of bony lumps in the external acoustic meatus it’s not dangerous but can potentially lead to hearing loss but surfers ear is common in the surfing population population groups okay so that was for the external ear.
Let us now look at the eardrum this is what you see are on an otoscope autoscopic view where you are examining the external ear so on the eardrum we’re going to look at some important parts of the examination so here is what’s known as the cone of light the UNPO the lateral process of thethe malleus the pars flaccida and the posterior malleolar folds so the malleus is important here because it is actually the the first bony obstacle that articulates with the eardrum anyway the eardrum receives sound vibrations which triggers a cascade of vibrations within the middle ear which will then send these vibrational sync signals to the inner ear problems such as tympanic membrane perforation which is a result of many causes mainly truma.
an infection can be a problem in transmitting such processes but also i can be very painful most most tympanic membrane perforation heal spontaneously but but if it’s large the perforation it would it would require surgery to fix .