Essay
"The sensory organ for hearing"
- Course
- Institution
"The human ear: Nature's delicate receiver, transforming vibrations into the melodies of existence."
[Show more]
Seller
Follow
hridyagopi
Content preview
EAR Organ of hearing and equilibrium. Also known as, Teloreceptor or
phonoreceptor or Stato-acoustic receptor.
It has three divisions: external ear ,middle ear, internal ear.
External Ear
External ear is formed by two parts :auricle or pinna and external auditory
meatus.
Auricle or pinna
Auricle or pinna of external ear consist of fibro cartilaginous plate covered by
connective tissue and skin. In man, extrinsic and intrinsic muscles of auricle
are rudimentary and the movements is not possible. The depression of auricle
, which forms the orifice of external auditory meatus is called concha.
External auditory meatus tarts from concha and extends inside as a slightly
covered canal, with length of about 55mm
External auditory meatus
Cartilaginous part is the initial part of external auditory meatus and is made
up of cartilage . It is covered by thick skin, which contains stiffs hairs. These
hairs prevent the entry of foreign particles . Large sebaceous glands and
ceruminous glands are also present in the skin covering this portion.
Secretions of ceruminous glands, sebaceous glands and desquamated
epithelial cells from the earwax.
Inner part of external auditory meatus is also covered by skin. Only
sebaceous glands are present here. Skin covering this portion is continuous
with particular layer of tympani membrane.
Middle ear
Middle ear or tympanic cavity is a small narrow irregular laterally compressed
chamber, situated within the temporal bone. It is also known as tympanum. It
is separated from external unitary meatus by tympanic membrane. Middle
ear consist of the following structure: Auditory ossicles, auditory muscles and
Eustachian tube.
Tympanic membrane is a thin, semi-transparent membrane, which separates
the middle ear from external auditory meatus.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller hridyagopi. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now