Bony and Membranous Labyrinths

Question 0

What are the two membranes that separate the three scalas

Answer 0

Reisner’s membrane vestibuli and media

Basilar membrane media and tympani

Question 1

The ear is a very mobile transducer

Answer 1

Scala vestibuli perilymph
Scala media endolymph potassium +
Scala tympani perilymph sodium -

Question 2

The cochlear core

Answer 2

As the labyrinth twists around the inside is bony, this forms shelf that is called the osseous spiral lamina. Combined this would look like a screw. Forming the core inside the bone shelf is a large trunk of the auditory nerve the modiolus.

Question 3

The spiral limbus

Answer 3

On the top of the osseous spiral lamina is the spiral limbus. Spiral limbus is a bone covering that the Reisner’s membrane connects to. The basilar membrane connects to the bottom of the osseous spiral lamina.

Question 4

Rosenthal’s Canal

Answer 4

Bony portion in the middle. Contains the cell bodies/spiral ganglia of the auditory nerve.

Question 5

Habenula Perforata

Answer 5

Perforations in the osseous spiral lamina. What the auditory nerve projects through to connect to the hair cells.