medulla
kilikili
sensory neurone --> enters spinal cord --> relay neurone --> brain(is not a reflex action) or motor neurone(if action is reflex)
First stimulus received through the senses, Sense changed stimulus to an impulse than a sensory nerve capture the impulse, conducts the impulse to the spinal cord than the brain stem to the brain, then from the brain to the brain stem through the spinal cord to a motor nerve to a muscle or gland
Sensory neurons
the gate keeper of human brain is thallamus which is the floor of dihensephallon. It sort out the outgoing impulse from brain and incoming impulse from spinal cord.
The brain stem
When you are stung by a bee you don't feel it until the impulse reaches your brain. The signal travels along your nerves to your spinal cord, where it is turned into a chemical message and sent to your brain.
Nerve impulses travel up through nerves, into the spinal cord and into one of the different lobes of the brain depending on where the impulse comes from. For example, if the impulse comes from your ear, the impulse would travel to the temporal lobe.
A reflex. Reflexes are processed by the spinal cord in order to provide a quicker reaction than would be achieved if the signal travelled all the way to the brain and back.
The spinal cord is a nerve cord inside the spine traveling all the way to the brain, so if you didn't have the nerve cord you're brain couldn't send/receive messages to the body
The initial sensory receptor detects a change e.g temperature. This is sent as an electrical impulse via a series of sensory receptors to the spine, if there is a problem a reflex occurs. If there is no problem the impulse is transmitted to the brain through the spinal cord.
Sensory information is transmitted by the sensory neurons. They are nerve cells that convey data to spinal cord and brain.