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The auricle or auricula is the visible part of the ear that is outside the head. It is also called the pinna ( Latin for ' wing ' or ' fin ', pl. : pinnae ), a term that is used more in zoology . Structure
The visible part is called the auricle, also known as the pinna, especially in other animals.It is composed of a thin plate of yellow elastic cartilage, covered with integument, and connected to the surrounding parts by ligaments and muscles; and to the commencement of the ear canal by fibrous tissue.
Auricle, auricula or auricula may refer to: Auricle (anatomy), the external portion of the ear; Auricle, former name of the atrium of the heart; still used to describe this chamber in some other animals; Auricle (botany), an ear-like projection on the base of a leaf or petal; Auricles, ear-like projections at the base of the head of a planarium
The auricle consists of the curving outer rim called the helix, the inner curved rim called the antihelix, and opens into the ear canal. The tragus protrudes and partially obscures the ear canal, as does the facing antitragus. The hollow region in front of the ear canal is called the concha. The ear canal stretches for about 1 inch (2.5 cm).
The human earlobe (lobulus auriculae), the lower portion of the outer ear, is composed of tough areolar and adipose connective tissues, lacking the firmness and elasticity of the rest of the auricle (the external structure of the ear). In some cases the lower lobe is connected to the side of the face.
The folds of cartilage surrounding the ear canal are called the auricle. Sound waves are reflected and attenuated when they hit the auricle, and these changes provide additional information that will help the brain determine the sound direction. The sound waves enter the auditory canal, a deceptively simple tube.
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The posterior auricular muscle is found behind the auricle of the outer ear. [1] It consists of two or three fleshy fasciculi. These arise from the mastoid part of the temporal bone by short aponeurotic fibers. [1] They insert into the lower part of the cranial surface of the auricle of the outer ear. [1]