Cochlear Anatomy and Function

The video tutorial explains the structure and function of the cochlea, focusing on its unique labyrinths, fluids, and membranes. It details the role of the organ of Corti in converting sound waves into action potentials and describes the frequency tuning of the basilar membrane. The tutorial also covers the innervation of the cochlea and its connection to the central nervous system via cranial nerve 8.

What are the two labyrinths found in the cochlea?

• Anterior and Posterior

• Upper and Lower

• Inner and Outer

• Osseous and Membranous

What is the unique fluid found in the cochlear duct?

• Blood plasma

• Perilymph

• Endolymph

• Cerebrospinal fluid

Which ion is found in high concentration in the endolymph?

• Chloride

• Potassium

• Calcium

• Sodium

What is the primary function of the organ of Corti?

• To amplify sound

• To balance pressure in the ear

• To convert sound waves into action potentials

• To produce earwax

Where are high-frequency sounds detected in the cochlea?

• At the apex

• In the middle

• At the base

• Throughout the cochlea

What is the role of the basilar membrane in the cochlea?

• To protect the inner ear

• To vibrate in response to sound frequencies

• To separate the scala media from the scala tympani

• To produce sound

Which cranial nerve is associated with the cochlea?

• Cranial nerve 12

• Cranial nerve 8

• Cranial nerve 5

• Cranial nerve 10

What is the function of the spiral ganglion in the cochlea?

• To produce endolymph

• To house nerve cell bodies

• To amplify sound

• To balance ear pressure

Through which structure does the cochlear nerve exit the inner ear?

• Internal acoustic meatus

• Eustachian tube

• External auditory canal

• Oval window

What forms cranial nerve number 8?

• Optic and olfactory nerves

• Trigeminal and abducens nerves

• Facial and glossopharyngeal nerves

• Cochlear and vestibular nerves