basic organisation of the CNS

Question 1

cephalisation

Answer 1

increasing clustering of neural processing into a brain as organisms get more complex

Question 2

arthropod cns

Answer 2

• segmented body with clusters of neural processing (ganglia) along ventral (bottom) surface
• historically one ganglion per segment but some have fused/been lost as segments have lost appendages

Question 3

arthropod brain

Answer 3

• fusion of multiple different ganglia that control different sensory segments
• protocerebrum, deutocerebrum, tritocerebrum

Question 4

protocerebrum

Answer 4

processing of sensory information from compound and simple eyes

Question 5

deutocerebrum

Answer 5

processes sensory information from antennae

Question 6

tritocerebrum

Answer 6

processes sensory information from labrum (front of face)

Question 7

vertebrate spinal chord

Answer 7

• segmented by different nerves entering and exiting at each vertebrae
• grey matter inside spinal chord contain Nissl bodies, structures that synthesise neurostransmitters
• white matter around outside of spinal chord contain myelinated axons
• dorsal root = sensory neurons in
• ventral root = motor neurons out