11/19/2023 0 Comments Anvil ear also called orricle![]() There is a small flexible chain of three small bones called ear ossicles- the malleus (hammer shaped), the incus (anvil shaped) and the stapes (stirrup shaped).The tympanic cavity, filled with air is connected with the nasopharynx through the Eustachian tube (auditory tube), which serves to equalize the air pressure in the tympanic cavity with that on the outside.The cerumen (ear wax) prevents the entry of the foreign bodies into the ear. The sound waves produce pressure changes over the surface of the tympanic membrane. It directs sound waves towards the tympanic membrane. The handle of the malleus is firmly attached to the membrane’s internal surface. The central part of the tympanic membrane is called the umbo. It is thin and semi-transparent, almost oval, though somewhat broader above than below. Separates the tympanic cavity from the external auditory meatus. The latter are modified sweat glands which secrete a waxy substance- the cerumen (ear wax) which prevents the foreign bodies entering the ear. ![]() The meatus (canal) is internally lined by hairy skin (stratified epithelium) and ceruminous glands (wax glands). It is a tubular passage supported by cartilage in its exterior part and by bone in its inner part. It is sensitive as well as effective in collecting sound waves. The lobule is the soft pliable part at its lower end composed of fibrous and adipose tissue richly supplied with blood capillaries. Its most prominent outer ridge is called the helix. The pinna is a projecting elastic cartilage covered with skin. It comprises a pinna, external auditory meatus (canal) & tympanic membrane. Uttarakhand UKPCS Mains papers and syllabusĮach human ear consists of three portions:.UKPCS Essay : How to write a great essay and topic list.UKPCS Study material || UKPCS Notes || Paper Analysis.UKPSC LOWER PCS Syllabus || Past papers.UPSC Prelims Mock Test Quiz Menu Toggle.UPSC-IAS civil services exam guide for beginners.
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