acoustic meatus

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.

Acoustic meatus may refer to:

External acoustic meatus (or ear canal)

Temporal bone: contains the eternal acoustic meatus, which transmits sound from the ear to the cochlea (eardrum)

Section of the facial and acoustic nerves within internal acoustic meatus (the separation between them is not apparent in the section)

Internal acoustic meatus (or internal auditory meatus)

As it ascends between the external acoustic meatus and mastoid process it divides into auricular and occipital 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.

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.

Santorini's fissures: Vertical fissures in the anterior part of the cartilage of the external acoustic meatus (ear canal).

The intermediate nerve reaches the posterior cranial fossa via the internal acoustic meatus before synapsing in the solitary nucleus.

There, it supplies the auricle, external acoustic meatus, outer side of the tympanic membrane and the skin in the temporal region (superficial temporal branches).

It emerges from the pons and exits the inner skull via the internal acoustic meatus (or internal auditory meatus) in the temporal bone.

The porion is the point on the human skull located at the upper margin of each ear canal (external auditory meatus, external acoustic meatus).

The opening to the internal acoustic meatus is located inside the cranial cavity, near the center of the posterior surface of the petrous part of the temporal bone.

The internal acoustic meatus transmits the facial and vestibulocochlear nerves and the labyrinthine artery (an internal auditory branch of the basilar artery).

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.

Huschke 's foramen: An opening in the floor of the bony part of the external acoustic meatus in the vicinity of the tympanic membrane.

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.

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.

Exits the skull through the internal acoustic meatus as part of the facial nerve, then it travels through the middle ear, where it runs from posterior to anterior across the tympanic membrane.