Cockroach Startle

Question 1

Nervous system

Answer 1

brain- thoracic ganglion- connective nerves- abdominal ganglion- segmental nerves

Question 2

brain not necessarily

Answer 2

involved in startle behaviour

Question 3

Can start running from

Answer 3

air produced from movement of tongue before it leaves mouth

Question 4

sense organs

Answer 4

cercus- 20 segments
bears various sensilla including filliform
filiform- 14 per segment (small hairs) sensitive to sudden air movements
each filiform most sensitive to air from a particular direction

Question 5

From air to running

Answer 5

Cercal filiform sensila send axons to last abdominal ganglia
synapse with particulat GIs
GIs axons carry signal to thoracic ganglia

Question 6

G1

Answer 6

attack from same side as axon

Question 7

G2

Answer 7

rear

Question 8

G3

Answer 8

front

Question 9

Why do different GIs respond to threats from different directions?

Answer 9

because they synapse with different filiform sensila

Question 10

extra spikes increase

Answer 10

the angle of turn of escape

Question 11

How many degrees turn does 1 spike cause?

Answer 11

7.4 degrees