the number of other neurons that are connected to the neuron .

the size of stimulus that activates the sensory neuron.

the type of stimulus that activates a sensory neuron in the somatosensory system.

the total area of the sensory receptor surface for all neurons in that sensory system.

the area of the sensory receptor surface providing input to that neuron.

Through efferent motor neurons of the Somatic Nervous Systems 

Through hypothalamic release of hormones into the blood stream to target tissue

Through diffuse control of internal organs via the Autonomic Nervous System

Through cortical release of hormones and local chemical mediators into the blood stream to target tissue

Through cerebellar of neurotransmitters and hormones to ANS neurons to target tissue

H

A

I

E

F

Nerve fibres from each sensory system merge in the midbrain but are otherwise separate

Each sensory modality has a different set of structures to process the stimulus energy into APs

There are number of discrete nuclei for each sensory system from periphery to cortex

There is a dedicated set of nerve tracts and nuclei devoted to processing only input from a sensory modality

There is a systematic map of the sensory system in the cortex

They are four sets of interconnected fluid-filled spaces in the brain

They function to supply nutrients to and remove waste products from the brain and spinal cord tissues.

They are filled with CSF which bathes and cushions the brain 

They arise from expansion of the lumen of the neural tube

They act to promote large changes in the ionic and chemical composition of the fluid in and around the brain

Block foveal function

Promote lens accommodation

Block pupillary dilation

Block corneal refraction

Cause pupillary dilation