Table of Contents
- 1 What passes through the external acoustic meatus and acoustic canal?
- 2 What does the external acoustic meatus connect?
- 3 What Innervates the external acoustic meatus?
- 4 How does the external auditory meatus ear canal contribute to the acoustic reflex?
- 5 Which is also known as the external acoustic meatus quizlet?
- 6 Is external acoustic meatus a foramen?
What passes through the external acoustic meatus and acoustic canal?
Transmission of sound. At the external ear, sound waves captured by the auricle enter the external acoustic meatus, and travel through it to the tympanic membrane.
What does the external acoustic meatus connect?
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.
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 are the two functions of the external auditory meatus?
The ear canal – the auditory canal Once the sound waves have passed the pinna, they move two to three centimetres into the auditory canal before hitting the eardrum, also known as the tympanic membrane. The external auditory canal’s function is to transmit sound from the pinna to the eardrum.
What Innervates the external acoustic meatus?
The lateral surface of the tympanic membrane, the external auditory canal, and the external acoustic meatus are all innervated by nervus intermedius (a branch of CN VII), the auriculotemporal nerve (CN V3), and the auricular branch of the vagus nerve.
How does the external auditory meatus ear canal contribute to the acoustic reflex?
The middle ear transmits acoustic energy from the external auditory meatus to the cochlea. When the sound enters the middle ear cavity, its acoustic energy is converted into the mechanical energy, then into hydraulic energy when entered to cochlear fluids.
What nerve exits the external acoustic meatus?
A sensory branch exits the nerve immediately below the stylomastoid foramen and innervates the posterior wall of the external acoustic meatus and a portion of the tympanic membrane. Next, the posterior auricular nerve leaves the facial nerve and innervates the posterior auricular and occipitalis muscles.
What is an acoustic meatus?
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.
Which is also known as the external acoustic meatus quizlet?
Also known as “pinna” is the skin-covered cartilaginous structure encircling the auditory canal opening. Outermost ridge of the auricle/pinna. External Acoustic Meatus. Also known as “external auditory canal” within the temporal bone, leads to the tympanic membrane, or eardrum.
Is external acoustic meatus a foramen?
The external auditory canal is typically 2.5 cm in length and is S-shaped. A normal variant defect in the anteroinferior aspect of the osseous part of the canal that connects with the temporomandibular joint is known as the foramen tympanicum (foramen of Huschke).
What is the function of acoustic meatus?
The internal auditory meatus provides a passage through which the vestibulocochlear nerve (CN VIII), the facial nerve (CN VII), and the labyrinthine artery (an internal auditory branch of the anterior inferior cerebellar artery in 85% of people) can pass from inside the skull to structures of the inner ear and face.