What bone is the external acoustic meatus?
What bone is the external acoustic meatus?
temporal bone
The external acoustic meatus (also external auditory meatus, external auditory canal or ear canal, latin: meatus acusticus externus) is an air-filled tubular space that extends from the auricle of the external ear into the temporal bone to the tympanic membrane.
Which part of the temporal bone includes the internal acoustic meatus?
petrous
Anatomical terms of bone The internal auditory meatus (also meatus acusticus internus, internal acoustic meatus, internal auditory canal, or internal acoustic canal) is a canal within the petrous part of the temporal bone of the skull between the posterior cranial fossa and the inner ear.
Where is the acoustic nerve located?
The cochlear nerve, also known as the acoustic or auditory nerve, is the cranial nerve responsible for hearing. It travels from the inner ear to the brainstem and out through a bone located on the side of the skull called the temporal bone.
Which nerves run through the internal auditory meatus in the petrous portion of the temporal bone?
The internal acoustic meatus is another canal passing through the petrous part of the temporal bone between the posterior cranial fossa and the external acoustic meatus. Passing through this opening are the facial nerve (CN VII), the vestibulocochlear nerve (CN VIII) and the labyrinthine artery.
What is an acoustic meatus?
external auditory canal, also called external auditory meatus, or external acoustic meatus, passageway that leads from the outside of the head to the tympanic membrane, or eardrum membrane, of each ear. The canal is nearly 1 inch (2.5 cm) in length and is lined with skin that extends to cover the tympanic membrane.
What does the external acoustic meatus do?
It consists of the auricle and external acoustic meatus (or ear canal)….External ear.
| Parts | Auricle, external acoustic meatus |
|---|---|
| Function | Conducts sound to the inner ear |
What does the acoustic meatus do?
The internal acoustic canal (IAC), also known as the internal auditory canal or meatus (IAM), is a bony canal within the petrous portion of the temporal bone that transmits nerves and vessels from within the posterior cranial fossa to the auditory and vestibular apparatus.
What does auditory meatus mean?
Definitions of auditory meatus. either of the passages in the outer ear from the auricle to the tympanic membrane. synonyms: acoustic meatus, auditory canal, ear canal, external auditory canal. type of: meatus. a natural body passageway.
What is acoustic nerve?
The cochlear nerve, also known as the acoustic nerve, is the sensory nerve that transfers auditory information from the cochlea (auditory area of the inner ear) to the brain. It is one of the many pieces that make up the auditory system, which enables effective hearing.
Which nerve is the acoustic nerve?
vestibulocochlear nerve, also called Auditory Nerve, Acoustic Nerve, or Eighth Cranial Nerve, nerve in the human ear, serving the organs of equilibrium and of hearing.
What meatus means?
noun, plural me·a·tus·es, me·a·tus. Anatomy. an opening or foramen, especially in a bone or bony structure, as the opening of the ear or nose.
What forms the external acoustic meatus?
The external acoustic meatus is formed partly by cartilage and membrane, and partly by bone, and is lined by skin. The cartilaginous portion (meatus acusticus externus cartilagineus) is about 8 mm.
What passes through the external acoustic meatus?
Internal acoustic meatus. A short, narrow passageway through the temporal bone of the skull where the vestibular nerve and cochlear nerve pass through to reach the brainstem from the inner ear. In humans, the internal acoustic meatus is about 1-2 cm in length. Aside from the vestibular nerve (responsible for balance) and cochlear nerve…
What does bone have the internal auditory meatus?
Anatomical terms of bone. The internal auditory meatus (also meatus acusticus internus, internal acoustic meatus, internal auditory canal, or internal acoustic canal) is a canal within the petrous part of the temporal bone of the skull between the posterior cranial fossa and the inner ear.
What bone is the external auditory meatus on?
The tympanic part of the temporal bone lies inferiorly to the squamous, and anteriorly to the petromastoid part. It surrounds the external auditory opening, which leads into the external auditory meatus of the external ear. The styloid process located immediately underneath the opening to the auditory meatus.
