### Sorting the Pathway of Action Potential in Sensory Neurons#### Task:Sort the structures that the action potential would pass through after being generated by the **first order sensory neuron**. #### Instructions:Drag and drop options into the correct order and submit.#### Structures:1. **Thalamus**2. **Anterior Ramus of Spinal Nerve**3. **Posterior Root and Rootlets**4. **Somatosensory Cortex of the Cerebrum**5. **Posterior Funiculus**6. **Brainstem**7. **Brachial Plexus**8. **Posterior Grey Horn** **Instruction:** Place the structures in order from the generation of the action potential to the structure that will synapse with a skeletal muscle at the neuromuscular junction.**Guideline:** Drag and drop options into correct order and submit.**Options:**1. Cerebral peduncles of the midbrain2. Brachial plexus3. Peripheral nerve4. Upper motor neurons in the left primary motor cortex5. Lower motor neuron in the anterior grey6. Lateral corticospinal tract7. Pyramids of the medulla oblongata8. Internal capsule of the cerebrum

The orchestration of sensory information and motor control within the human body involves a complex interplay of neural structures. The journey begins with the generation of action potentials in sensory neurons as they navigate through the intricate pathways of the nervous system. These signals traverse the spinal cord, ascend through critical relay centers in the brainstem and thalamus and finally reach the cerebral cortex for conscious interpretation. Simultaneously, the brain initiates motor commands with action potentials originating in the primary motor cortex coursing through various neural tracts and ultimately reaching the neuromuscular junction to elicit precise muscle movements. Together, this intricate dance of sensory and motor pathways allows us to perceive our environment and respond with coordinated and purposeful actions.Let's delve into the fascinating sequence of events that govern these neural processes.Let's break down the sequence:Posterior Root and Rootlets:This is where the action potential starts. It originates in the sensory receptors, travels through the peripheral nerves, and enters the spinal cord through the posterior root.Posterior Grey Horn:Within the spinal cord, the sensory neuron synapses with a second-order neuron in the posterior grey horn. Here, the signal may be processed or relayed to higher levels of the nervous system.Posterior Funiculus:The posterior funiculus is a bundle of nerve fibers in the spinal cord that carries sensory information (including the action potential) to the brain.Anterior Ramus of Spinal Nerve:The action potential may cross to the opposite side of the spinal cord and then travel outward through the anterior ramus of the spinal nerve.Brachial Plexus:The anterior ramus of the spinal nerve joins with other nerves in the brachial plexus, a network of nerves that innervates the upper limb.Brainstem:The action potential ascends through the spinal cord and reaches the brainstem. The brainstem is a critical relay center that connects the spinal cord to higher brain regions.Thalamus:The thalamus is a central relay station in the brain that processes and relays sensory information to the cerebral cortex.Somatosensory Cortex of the Cerebrum:Finally, the action potential reaches the somatosensory cortex of the cerebrum, where conscious perception and interpretation of sensory stimuli occur.So, the sequence represents the journey of sensory information from its origin in the peripheral nervous system to the processing centers in the central nervous system and ultimately to the cortex for conscious awareness and interpretation.Let's break down the sequence step by step:Upper motor neurons in the left primary motor cortex:The process begins in the primary motor cortex, where upper motor neurons reside. These neurons are responsible for initiating voluntary motor movements.Internal capsule of the cerebrum:The axons of upper motor neurons travel through the internal capsule, which is a white matter tract in the brain. It serves as a major highway for motor fibers.Cerebral peduncles of the midbrain:The internal capsule fibers continue down through the cerebral peduncles, which are part of the midbrain. These peduncles are involved in various functions, including motor control.Pyramids of the medulla oblongata:The fibers then cross over to the opposite side in the medulla oblongata, forming what is known as the pyramidal tracts. This crossing is called decussation.Lateral corticospinal tract:The crossed fibers descend as the lateral corticospinal tract. This tract continues down the spinal cord.Lower motor neuron in the anterior grey:In the spinal cord, the fibers synapse with lower motor neurons in the anterior grey matter. These lower motor neurons are responsible for carrying the signal out of the spinal cord.Peripheral nerve:The axons of the lower motor neurons exit the spinal cord and join together to form peripheral nerves. These nerves extend from the spinal cord to the muscles.Brachial plexus:In the case of the upper limbs, the peripheral nerves often form complex networks known as plexuses. The brachial plexus, for example, is responsible for supplying the nerves to the arm.In summary, the sequence describes the pathway from the initiation of a voluntary motor command in the brain to the actual execution of the movement by the muscles in the periphery. The last steps involve the peripheral nerve and the brachial plexus, which ultimately connect to the skeletal muscles at the neuromuscular junction, allowing for the contraction of muscles in response to the initial motor command.Therefore, here are the correct orders( in ascending order):Posterior root and rootletsPosterior grey hornPosterior funiculusAnterior ramus of spinal nerveBrachial plexusBrainstemThalamusSomatosensory cortex of the cerebrumHere is the correct order( In descending order):Upper motor neurons in the left primary motor cortexInternal capsule of the cerebrumCerebral peduncles of the midbrainPyramids of the medulla oblongataLateral corticospinal tractLower motor neuron in the anterior greyPeripheral nerveBrachial plexus