Response to stimuli and the spinal cord

The spinal cord
Reflex – think of sensory neuron –> interneuron –> motor neuron
Receptor –> sensory neuron –> integration centre –> motor neuron –> effector
Nerve net in Cnidaria


The nervous system processes information throughout the body by carrying signals between the central nervous system (CNS) and peripheral nervous system (PNS). The CNS is composed of the brain and spinal cord, while the PNS consists of nerves which are connected to the CNS and reach the rest of the body.

The spinal cord consists of a central canal filled with cerebrospinal fluid, and grey (H shape) and white matter. Nerves connect to the cord, while the meninges act to protect the cord (alongside the brain).

The so-called spinal nerves are attached in the same pattern across the spinal cord, with a dorsal root and a ventral…

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