RezeptorNeuronen

Rezeptorneuronen, also known as sensory neurons, are nerve cells that transmit sensory information from sensory receptors towards the central nervous system (CNS). They are crucial for our ability to perceive the world around us, encompassing senses like sight, hearing, touch, taste, and smell. Each type of receptor neuron is specialized to detect a specific type of stimulus. For example, photoreceptor neurons in the eyes respond to light, mechanoreceptor neurons in the skin detect pressure and vibration, and chemoreceptor neurons in the tongue and nose sense chemical compounds.

When a stimulus is detected by a sensory receptor, it triggers a change in the membrane potential of the receptor neuron. This change, if it reaches a threshold, generates an action potential, which is an electrical signal. This electrical signal then propagates along the axon of the receptor neuron. The axon carries the signal through peripheral nerves towards the spinal cord or brainstem. From these initial processing centers, the sensory information is relayed to higher brain regions, such as the thalamus and the cerebral cortex, where it is interpreted and perceived as a specific sensation.

The cell bodies of most receptor neurons are located in ganglia outside the CNS, such as the dorsal root ganglia for sensory neurons of the trunk and limbs, or cranial nerve ganglia for sensory neurons of the head. Receptor neurons are therefore considered afferent neurons, meaning they carry information towards the CNS. Their function is fundamental to all conscious awareness of our environment and plays a vital role in reflexes and maintaining homeostasis.