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In earth, most of the mammals have an external ear.

In earth, most of the mammals have an external ear. The ear is the part of our Auditory system. The part of the ear that is visible from outside is called Pinna. Being mammals, humans also have ears. Ears are located on both sides of the brain within the temporal bones of the skull. Pinna is made up of elastic yellow cartilages and it is covered with integument and tendons and muscles attach it with surrounding parts. In the fetus, the ear derives from the first pharyngeal pouch. Each layer of ear derives from different germinal layers, inner ear from Ectoderm, middle ear from Endoderm, and outer ear from Mesenchyme.  Structure of the Human Ear The human ear is divided into three sections, those are the outer ear, the middle ear, and the inner ear. The Outer Ear – 

[Image will be Uploaded Soon] The Smallest Bone in The Body The bones in the ear are the 3 smallest bones of the human body. The bones are malleus, incus, and stapes. Among these 3 bones, stapes is the smallest bone. The Function of The Human Ear

Human Ear Diagram In the human ear diagram, we can distinguish between the inner ear, middle ear, and the outer ear. [Image will be Uploaded Soon] Human Ear Structure and Function Different structures of the human ear help in different functions.

The Basic Foundation of The Outer Ear The outer ear consists of the fleshy pinna, the outer and inner rim curving of the pinna is called helix and antihelix respectively. Antihelix opens into the ear canal. The first part of the bone is surrounded by cartilage and the area near eardrum is surrounded by bone. The bony part near the eardrum is called auditory bulla, it is formed by temporal bone. Fun-fact Egg-laying mammals are called monotremes, as they are primitive mammals they don’t have pinna in their body.

The oval window is involved in amplification. The surface area ratio of the tympanic membrane and oval window is 20:1. So it can allow adequate energy supply between the air-filled middle ear and the fluids of inner air. Without the presence of the middle ear, 98% of energy will be reflected back and will not enter the fluid-filled inner ear. The middle ear acts as the pressure amplifier. It collects the acoustic energy and augments the amplitude of the mechanic-acoustic stimuli in the inner ear. So, we can call the middle ear as the impedance matcher.

There are three types of hearing loss.