Illustration of the human reflex arc
Wall Art and Photo Gifts from Science Photo Library
Illustration of the human reflex arc
Reflex arc. Illustration of a human reflex arc. Sensory nerve endings (lower right) detect a stimulus, such as pain. The nervous signal passes along the sensory nerve cell fibre to the spinal cord (left), where synapses transmit the signal to a motor nerve cell via an interneuron. The sensory nerve cell body is shown at centre left in a ganglion just outside the spinal cord. The motor nerve cell transmits the signal to an appropriate effector organ, in this case a muscle in the arm. Reflexes like this happen involuntarily, before the brain has had time to receive or interpret the stimulus
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6446821
© FRANCIS LEROY, BIOCOSMOS/SCIENCE PHOTO LIBRARY
Central Nervous System Nerve Nerve Cell Nerves Nervous Stimulation System Nervous System
EDITORS COMMENTS
This print showcases an intricate illustration of the human reflex arc, shedding light on the fascinating workings of our nervous system. At first glance, one's attention is drawn to the lower right corner where sensory nerve endings are depicted, diligently detecting a stimulus such as pain. The image then guides us along the sensory nerve cell fiber, which carries the nervous signal towards the left side of the frame and into the spinal cord. Within this vital organ lies a network of synapses that play a crucial role in transmitting signals to motor nerve cells via interneurons. Positioned at center-left, we observe the sensory nerve cell body residing within a ganglion just outside of the spinal cord—a testament to its pivotal function in relaying information. The journey continues as we witness how these signals are passed onto an appropriate effector organ—an arm muscle in this particular instance—by motor nerve cells. What makes this process truly remarkable is that it occurs involuntarily and swiftly, before our brain even has time to receive or interpret the initial stimulus. Through this visually stunning artwork from Science Photo Library, we gain insight into both peripheral and central components of our nervous system while marveling at its ability to respond rapidly through reflex arcs.
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