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The external acoustic meatus is nearly 2 cm.
It is located just behind the external acoustic meatus, and lateral to the styloid process.
The external ear consists of the auricule and the external acoustic meatus.
Its lateral border is free and rough, and gives attachment to the cartilaginous part of the external acoustic meatus.
External acoustic meatus (or ear canal)
As it ascends between the external acoustic meatus and mastoid process it divides into auricular and occipital branches.
There, it supplies the auricle, external acoustic meatus, outer side of the tympanic membrane and the skin in the temporal region (superficial temporal branches).
While the muscle modifies the auricular shape only minimally in the majority of individuals, this action could increase the opening into the external acoustic meatus in some.
Santorini's fissures: Vertical fissures in the anterior part of the cartilage of the external acoustic meatus (ear canal).
Its postero-superior surface is concave, and forms the anterior wall, the floor, and part of the posterior wall of the bony external acoustic meatus.
The porion is the point on the human skull located at the upper margin of each ear canal (external auditory meatus, external acoustic meatus).
Huschke 's foramen: An opening in the floor of the bony part of the external acoustic meatus in the vicinity of the tympanic membrane.
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.
The tympanic part of the temporal bone is a curved plate of bone lying below the squama, in front of the mastoid process, and surrounding the external acoustic meatus.
Anteriorly the mastoid portion is fused with the descending process of the squama above; below it enters into the formation of the external acoustic meatus and the tympanic cavity.
Other complications included otitis externa (swimmer's ear), which involves inflammation or bacterial infection of the external acoustic meatus, as well as pain, vertigo, tinnitus, and perforation of the ear drum.
The parotid glands are a pair of serous salivary glands located below and in front of the external acoustic meatus draining their secretions into the vestibule of oral cavity through stensen's duct.
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 external acoustic meatus by fibrous tissue.
Their afferent vessels drain the root of the nose, the eyelids, the frontotemporal region, the external acoustic meatus and the tympanic cavity, possibly also the posterior parts of the palate and the floor of the nasal cavity.
Between the posterior wall of the external acoustic meatus and the posterior root of the zygomatic process is the area called the suprameatal triangle (Macewen), or mastoid fossa, through which an instrument may be pushed into the tympanic antrum.
It ascends in the substance of the parotid gland, behind the temporomandibular articulation, pierces the cartilaginous or bony wall of the external acoustic meatus, and supplies its cuticular lining and the outer surface of the tympanic membrane.
The mandibular fossa is bounded, in front, by the articular tubercle; behind, by the tympanic part of the bone, which separates it from the external acoustic meatus; it is divided into two parts by a narrow slit, the petrotympanic fissure.
Research on the bones recovered from the ossuary of Saint James's Chapel published in Anthropological Science revealed a case of atresia of the external acoustic meatus, a defect of the opening into the auditory canal, something not common in historic and prehistoric populations.