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Questions and Answers
Which cranial nerve is responsible for the sensory innervation of the auricle's cranial surface?
Which cranial nerve is responsible for the sensory innervation of the auricle's cranial surface?
- Lesser occipital nerve
- Greater occipital nerve
- Vagus nerve (correct)
- Auriculotemporal nerve
What is the name of the air-filled space in the middle ear?
What is the name of the air-filled space in the middle ear?
- Labyrinth
- Tympanic cavity (correct)
- Auricle
- External acoustic meatus
Which artery supplies blood to the auricle?
Which artery supplies blood to the auricle?
- Post auricular artery
- Ant auricular artery
- Auricular artery (correct)
- Deep auricular artery
Where are the ceruminous glands located?
Where are the ceruminous glands located?
Which nerve provides motor innervation to the intrinsic and extrinsic muscles of the auricle?
Which nerve provides motor innervation to the intrinsic and extrinsic muscles of the auricle?
What is the function of the tympanic cavity in the middle ear?
What is the function of the tympanic cavity in the middle ear?
What is the function of the Eustachian Tube?
What is the function of the Eustachian Tube?
Which nerve innervates the Tensor tympani muscle?
Which nerve innervates the Tensor tympani muscle?
Where does the malleus attach to the Tympanic Membrane?
Where does the malleus attach to the Tympanic Membrane?
What is the composition of the Tympanic Membrane?
What is the composition of the Tympanic Membrane?
What is the function of the stapedius muscle?
What is the function of the stapedius muscle?
What is the function of the Middle Ear?
What is the function of the Middle Ear?
Which wall separates the tympanic cavity from the internal ear?
Which wall separates the tympanic cavity from the internal ear?
What is the function of the Tympanic Plexus?
What is the function of the Tympanic Plexus?
What is the clinical correlate associated with the Tegmental Wall (Roof)?
What is the clinical correlate associated with the Tegmental Wall (Roof)?
What is the entrance for the tympanic nerve (Glossopharyngeal nerve)?
What is the entrance for the tympanic nerve (Glossopharyngeal nerve)?
Which structure is sealed by the secondary tympanic membrane (round window membrane)?
Which structure is sealed by the secondary tympanic membrane (round window membrane)?
What divides the mandibular fossa into two parts?
What divides the mandibular fossa into two parts?
Where are the cell bodies of neurons located which send peripheral axons to innervate the auditory hair cells in the organ of Corti?
Where are the cell bodies of neurons located which send peripheral axons to innervate the auditory hair cells in the organ of Corti?
Which nerve is responsible for balance?
Which nerve is responsible for balance?
Which area of the brain is associated with language processing?
Which area of the brain is associated with language processing?
Which part of the ear contains sensory receptors for linear acceleration and the pull of gravity?
Which part of the ear contains sensory receptors for linear acceleration and the pull of gravity?
What is the longest human osseous canal of a nerve located in the temporal bone?
What is the longest human osseous canal of a nerve located in the temporal bone?
Where do the efferent fibers from the vestibular system descend to?
Where do the efferent fibers from the vestibular system descend to?
Which structure of the inner ear is responsible for balance?
Which structure of the inner ear is responsible for balance?
What divides the cochlear duct into Scala vestibuli and Scala typani?
What divides the cochlear duct into Scala vestibuli and Scala typani?
Which nerve innervates the inner ear and is responsible for hearing?
Which nerve innervates the inner ear and is responsible for hearing?
Which part of the ear amplifies vibrations and converts them into electrical signals?
Which part of the ear amplifies vibrations and converts them into electrical signals?
Where are the hair cells located in the inner ear for detecting high-pitched sounds?
Where are the hair cells located in the inner ear for detecting high-pitched sounds?
What is the continuous system of ducts filled with endolymph within the bony labyrinth called?
What is the continuous system of ducts filled with endolymph within the bony labyrinth called?
Study Notes
- The Ear's Tympanic Cavity is part of the outer ear and houses the Tympanic Membrane.
- The Inner Ear consists of the Bony Labyrinth and the Membranous Labyrinth.
- The Bony Labyrinth is a series of bony cavities within the petrous part of the temporal bone, including the Cochlea, Vestibule, and Semicircular Canals.
- The Membranous Labyrinth is a continuous system of ducts filled with endolymph and lies within the bony labyrinth. It includes the Cochlear Duct, the organ of hearing, and the Utricle and Saccule, organs of balance.
- The Inner Ear's Cochlea is a snail-shell shaped structure with a canal called the cochlear duct, which winds spirally around the central axis for 23/4 turns. The cochlear duct is divided into two passageways, the Scala vestibuli and Scala typani, by the basal lamina.
- The Scala vestibuli and Scala typani are continuous with the vestibule and separated from each other by the helicotrema at the apex of the modiolus.
- The Cochlea contains the Organ of Corti, Reissner's membrane, Tectorial membrane, and Basilar membrane.
- The Semicircular Canals are bony structures that project posterosuperiorly from the vestibule and each forms 2/3rds of a circle. Each canal contains a semicircular duct and empties into the utricle.
- The Vestibulocochlear Nerve (CN VIII) innervates the inner ear and divides into the vestibular nerve and the cochlear nerve. The vestibular nerve is responsible for balance and the cochlear nerve is responsible for hearing.
- Sound waves travel through the ear and cause the tympanic membrane to vibrate, which is transmitted to the fluid of the inner ear through the oval window. The auditory ossicles amplify these vibrations and convert them into electrical signals, which transfer information to the auditory pathway in the brain.
- Hair cells in the inner ear are frequency-specific, with high-pitched sounds stimulating hair cells at the base of the cochlea and low-frequency sounds stimulating hair cells at the apex.
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Description
Test your knowledge of ear anatomy and the development of acute otitis media. Learn about the angles of the ear in children and adults and the structures of the tympanic cavity.
