![]() ![]() Efferent nerve fibers carry motor nerve signals from the anterior horn to the muscles.An integrating center, the point at which the neurons that compose the gray matter of the spinal cord or brainstem synapse.Afferent nerve fibers carry signals from the somatic receptors to the posterior horn of the spinal cord or to the brainstem.Somatic receptors in the skin, muscles and tendons.ĭuring a somatic reflex, nerve signals travel along the following pathway: Autonomic reflexes sometimes involve the spinal cord and some somatic reflexes are mediated more by the brain than the spinal cord. There are two types: autonomic reflex arc (affecting inner organs) and somatic reflex arc (affecting muscles). ![]() The brain will receive the input while the reflex is being carried out and the analysis of the signal takes place after the reflex action. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. Then, a contraction of the muscles (F, in red) is triggered, moving the bone (G).Ī reflex arc is a neural pathway that controls a reflex. ![]() There it will likely pass through a short interneuron (D, in purple) before continuing down a motor neuron (E, in blue) to the origin of the signal. When a stimulus (A) is encountered, the signal from that stimulus will travel up the sensory neuron (B, in green) to the spinal column (C). In a reflex arc, an action potential can bypass the brain for processing and uses dedicated neural pathways for faster processing. ![]()
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