Cell Types

Question 1

Octopus cells

Answer 1

PVCN
Fire at onset only.
Receive AN input across range of frequencies.

Question 2

Pyramidal cells

Answer 2

DCN
“Power”/”buildup”
Primary output of DCN connects excitatory and inhibitory neurons firing range

Question 3

Spherical Bushy cells

Answer 3

AVCN
Receive input from 1-3 AN fibers
Primary-like.
Synapses are mainly excitatory and on the cell body

Question 4

Globular Bushy cells

Answer 4

AVCN
Receive input from more than 1 AN fiber
Primary-like w/notch

Question 5

T-multipolar (Stellate)

Answer 5

AVCN
Receives AN input from restricted freq range
Chopper- regular dip between spikes
Intracellular voltage response

Question 6

INNER HAIR CELL

Answer 6

Type I afferent (myelinated)
many fibers synapse on one hair cell.
•	pear shaped
•	1 row
•	stereocilia are free
•	base in osseus spiral lamina
•	no active mechanism

Question 7

OUTER HAIR CELL

Answer 7

Type II afferent (unmyelinated), one nerve fiber synapses on many hair cells.
Efferent – info from brain to help with tuning
• Columnar
• 3-4 rows
• stereocilia in tectorial membrane
• based in basilar membrane
• active mechanism