Middle ear, Biology

Assignment Help:

MIDDLE EAR -

  1. Protected by tympanic bone. It's cavity is tympanic cavity.
  2. It is lined by simple cilliated columnar epithelium. It is connected to naso pharynx by Eustachian canal.
  3. Here valve is present, generally closed, during shouting, yawning & swallowing it is opened.
  4. Due to it on both sides of tympanum, pressure of air is equalized. Inflamation of eustachian tube is eutachitis.
  5. Cold may block the eustachian tube & the pressure outside and inside the middle ear do not equalige. So divers and fliers do not work when they have cold. Outside preesure is increases in diving & decresed in flying.
  6. Middle ear is connected to internal ear by fenestra ovalis or oval window and fenestra rotundus or round window.
  7. By fenestra ovalis sound waves enter in to internal ear. By fenestra rotundus sound waves come out if strong.
  8. Between tympanum and fenestra ovalis there is a chain of 3 bones collectively called as ear ossicles.
  9. Three bones are malleus, inchus & stapes. Malleus is hammer shaped attached to tympanum.
  10. Inchus is anvil shaped. Stapes is stirrup shaped, smallest bone with bone marrow.
  11. All bone are articuluted by hinge joint & fixed in position due to their respective ligaments.
  12. These bones are modification of articular, quadrate and hyomendibular.
  13. In frog collumella auris present, which is modification of hyomendibular.
  14. Ear ossicles transmit the vibration from the tympanic membrane to internal ear and also amplify them about 20 times.
  15. Two small muscles tensor tympani and stapedius, joined to malleus and stapes respectively, contract to prevent damage to the dellicate internal ear at the time of loud sound.

Related Discussions:- Middle ear

What volume of 19 m formic acid need in experiment, You are interested in u...

You are interested in using formic acid (pKa = 3.75) as a buffer for your biochemical Experiment. a) Would it be most useful for creating a buffered solution at pH 2, 4 or 6? Ex

Determine the parts consists in our urinary system, Determine the parts con...

Determine the parts consists in Our urinary system Our urinary system consists of following:  Two kidneys  Two ureters  One urinary bladder  One urethra Apart fr

Describe the effects of the failure of the pancreas, (a) Name the condition...

(a) Name the condition and (b) describe the effects of the failure of the pancreas to produce sufficient-insulin. (c) How is this condition treated? .

Explain the diarrhoeal management strategies, Explain the Diarrhoeal Manage...

Explain the Diarrhoeal Management Strategies? The diarrhoeal management strategies have had a major impact on less than 5 mortality rate. The distribution of ORS packets and ne

Physical properties of protoplasm, P HYSICA L PROPERTIES OF PROTOPLASM - ...

P HYSICA L PROPERTIES OF PROTOPLASM - 1 .       Phase reversal - Due to difference in temperature outer part is gel and inner part of sol 2.       Tyndall effect - Be

Explain in brief about leukotrienes and prostaglandins, Leukotrienes and pr...

Leukotrienes and prostaglandins are produced only when the mast cell undergo degranulation and enzymatic break down of phospholipids in the plasma membrane. The effects formed b

Explain about the dietary calcium requirements, Explain about the Dietary C...

Explain about the Dietary Calcium Requirements? There are variations in the amount of calcium recommended by different advisory groups. This is mainly due to the different crit

Gene, Gene  is the fundamental physical and functional unit of the heredity...

Gene  is the fundamental physical and functional unit of the heredity (generally DNA, Some of the organisms have RNA a gene). A gene is an ordered series of nucleotides located in

What is form sense, What is Form Sense Form Sense is the  faculty which...

What is Form Sense Form Sense is the  faculty which  enables us  to perceive the  shape of  objects in  the  outer world. Here  the cones play  predominant part, and  the  form

Describe procedure for preparation of bacterial smear, Explain Procedure fo...

Explain Procedure for Preparation of Bacterial Smear? Now carry out the exercise using the steps enumerated herewith: 1. Collect swab samples from the suitable sampling site

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd