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What is neurons associated with sensory receptor?
third order neuron
Where does the first order neurons of cell body was located of their axon terminals located?
The first-order neurons in sensory pathways have their cell bodies located in the dorsal root ganglia for somatosensory pathways or in specific sensory ganglia for cranial nerves. The axon terminals of these neurons typically synapse in the spinal cord or brainstem, depending on the sensory modality being transmitted. For instance, in the case of pain and temperature sensations, the axon terminals connect in the dorsal horn of the spinal cord. In contrast, for the visual pathway, the first-order neurons have their cell bodies in the retina and project to the lateral geniculate nucleus in the thalamus.
Where do Ascending sensory neurons terminate?
Ascending sensory neurons primarily terminate in the spinal cord and brainstem, where they synapse with second-order neurons. These second-order neurons then project to various brain regions, including the thalamus, which relays sensory information to the appropriate areas of the cerebral cortex for processing. The precise termination points can vary depending on the specific sensory pathway involved, such as the dorsal column-medial lemniscal pathway or the spinothalamic tract.
What is the location for sensory neurons?
They can be found in the dorsal root ganglia, retina, peripheral vestibular organs, cochlea, and enteric nervous system. Then there are second order sensory neurons in the brain that form the basis of the 'sensory homonculus'.
Can a first order sensory neuron sometimes be a sensory receptor?
The first order sensory neuron can sometimes be a sensory receptor because it is what sends the signal to the brain from the receptor. The second order goes from the brainstem to the thalamus.
What is third order neuron?
A second order neuron is the 2nd neuron to carry an order. The order could be a sensory stimulus or a motor stimulus. For e.g. in order to move a muscle, the order for that muscle to contract starts at the cerebral cortex in the somatomotor area. That is the first order neuron. The axon of the 1st order neuron will synapse with the 2nd order neuron at the level of the brain stem, which commonly decussate (crosses over) to the opposite side. In turn, the axon of the 2nd order neuron will descend along the spinal cord tracts where it will synapse with the 3rd order neuron. The 3rd order neuron is located in the ventral horn of the spinal cord, which will exit with the spinal nerve to supply the muscle.
Do Second-order neurons of ascending sensory pathways always decussate.?
No! Only neurons of the specific (lemniscal) & non-specific (anterolateral) pathways decussate and sensation is therfore interpreted in the opposite cerebral hemisphere.Spinocerebellar ascending pathways transmit proprioceptive sensory stimuli to the same side of the cerebellum.
What is the order of a nerve path way?
The order of a nerve pathway typically follows this sequence: sensory receptors detect a stimulus and send signals to sensory neurons, which transmit the information to the spinal cord or brain. From there, interneurons process the information and may relay it to motor neurons, which then carry signals to effectors such as muscles or glands to elicit a response. This sequence allows for the integration of sensory input and the coordination of appropriate motor output.
Second order neurons of both specific and nonspecific ascending pathways terminate where?
Second order neurons of both specific and nonspecific ascending pathways terminate in the thalamus. From there, the thalamus sends projections to the somatosensory cortex for further processing of sensory information.
Where do first order sensory neuron axons reside?
In a ganglion.
What is the order of a visceral reflex?
The order of a visceral reflex involves sensory receptors detecting a stimulus, which then sends signals via afferent neurons to the central nervous system. The central nervous system processes the information and sends signals through efferent neurons to the effector organs, resulting in a response to the stimulus.
What is the connection between sensory nerves and the neurons in the brain?
Both use neurones which transmit in via action potential and synaptic transmission. Sensory neurones include pain neurones which enter directly into the brain, which perceives the stimulus as pain and gives emotional and motor responses accordingly. Sensory neurones also perceive homeostasis, in that they sense stimuli outside physiological norms and change homeostasis in order to rectify the problem. All motor and limbic (emotional) outputs from the brain are stimulated and therefore initiated by sensory neurone inputs. The spine relys information from peripheral sensory neurones to the brain, and is the literal connection between sensory neurones and the brain.
