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The ear canal (external acoustic meatus, external auditory meatus, EAM) is a pathway running from the outer ear to the middle ear.The adult human ear canal extends from the auricle to the eardrum and is about 2.5 centimetres (1 in) in length and 0.7 centimetres (0.3 in) in diameter.
From the pinna, the sound waves move into the ear canal (also known as the external acoustic meatus) a simple tube running through to the middle ear.This tube leads inward from the bottom of the auricula and conducts the vibrations to the tympanic cavity and amplifies frequencies in the range 2 kHz to 5 kHz.
This bony part is known as the auditory bulla and is formed by the tympanic part of the temporal bone. The ear canal ends at the external surface of the eardrum, while the surrounding skin contains ceruminous and sebaceous glands that produce protective earwax. [3] Earwax naturally migrates outward through ear canal, constituting a self ...
The porion is the point on the human skull located at the upper margin of each ear canal (external auditory meatus, external acoustic meatus). It lies on the superior margin of the tragus . It is a cephalometric landmark with significance in biological anthropology and in clinical applications such as oral and maxillofacial surgery .
Physical stimulation of the external acoustic meatus innervated by the auricular nerve elicits a cough, much like the other cough reflexes associated with the vagus nerve. Rarely, on introduction of speculum in the external ear, patients have experienced syncope due to the stimulation of the auricular branch of the vagus nerve.
On its lateral surface, it abuts the external auditory meatus (ear canal) from which it is separated by the tympanic membrane (eardrum). Walls.
Meatus may refer to: the external acoustic meatus, the opening of the ear canal; the internal auditory meatus, a canal in the temporal bone of the skull; the urinary meatus, which is the opening of the urethra, situated on the glans penis in males and in the vulval vestibule in females
Acoustic meatus may refer to: Internal acoustic meatus (or internal auditory meatus) External acoustic meatus (or ear canal) This page was last edited on 27 ...