concentrate on the middle ear so again here is the middle ear it contains the
auditory ossicles :
the smallest bones in the body .
remember the malleus which is one of the auditory ossicles the bones articulates with the ear drum and that’s why you can see some projections of the malleus on the outer stop autoscopic view.
anyway the middle ears the bony ossicles of the middle ear will send vibrations to the inner ear through tympanic membrane and middle ear containing auditory tube which will connect to the nasopharynx and which called Eustachian tube.
Eustachian tube is important because it sort of equalizes pressure within the middle ear and the outside world an important part of the Eustachian tube is that in children is more horizontal and shorter and thus children are more susceptible to ear infections or middle ear infections should I say that arise from the nose of
the mouth and it can travel up to the middle ear
Inferior to the middle ear you can find the internal jugular vein and this will lead us to the next topic which are the boundaries of the middle ear so the middle ear I’m talking about you know where the bony ossicles are so the boundaries that make up the middle ear and we’re going to look at the right middle here the inferior wall of the middle ear is also known as a jugular wall or jugular floor because this is where you can find the internal jugular vein run its course.
Tegmental wall on the top which is your frontal bone so it’s made up of your frontal bone the lateral wall the one most towards the outside is the membranous wall because this is basically your eardrum.
the medial aspect of the wall is the labyrinth and this is where you can find the inner ear there are important part the structures that make up the labyrinth wall and these are the oval window and the round window
also the prominence of the facial canal and the lateral semicircular canal can be found here the posterior wall is known as the mastoid wall because here is where we find the mastoid bone on this wall we can find the mastoid antrum now.
The mastoid antrum is important because it is relevant to mastoiditis the mastoid antrum is a cavity a continuous with collection of air filled spaces known as the mastoid cells now infection of the middle ear can spread to these mastoid cells and cause mastoiditis which is very painful .
the anterior wall of the middle ear is known as a carotid wall and here we can find the tympanic tube and tensor tympani muscle run its course so that was uh it a guess on the middle ear and the external ear.