Collections of neurons

Bundles of nerve axons 

A collection of sensory and motor neurons

Bundles of nerve cell bodies

Bundles of sensory nerve cell bodies

H

A

C

E

B

Through cortical control of the efferent neurons of the ANS

Through efferent motor neurons of the Somatic Nervous Systems 

Through efferent motor neurons of the Autonomic Nervous System

Through afferent sensory neurons of the Autonomic Nervous System

Through hypothalamic release of hormones and by the efferent neurons of the ANS

D

A

E

B

F

G, H and A

E and F

B and D

B, C and D

D, E and F

Through the ANS which co-ordinates activity of many internal organs

Through the use of hormones that can diffuse in the blood supply to affect many organs

Through four widespread neural systems that differ in the type of transmitter sued

Through hormones and through the neural connections of the Autonomic Nervous System

Through the neural connections of the Somatic and Autonomic Nervous Systems

G

A

C

B

F

Topographic "maps" of the sensory receptor surface along the pathway from periphery to cortex

Labelled lines from sensory periphery to cortex

The use of relay nuclei in relaying information from receptor surface to cortex

The use of diffuse modulatory systems defined by different neurotransmitters

Receptive fields that define the region of a receptor surface activating a neuron

They also break down cGMP

They also breakdown cAMP

They are also GPCRs

They allow influx of Na+

They also activate Transducin