Place the following sequence of events for the detection of somatic sensation in the proper order. Place a 1 by the first event, a 2 by the second event, and so on.     
a. ______The central process transmits the action potential to a second-order sensory neuron in the CNS.     
b. ______The action potential is transferred to the central process in the posterior root ganglion.     
c. ______The stimulus triggers an action potential.     
d. ______The signal is transferred to other CNS sensory neurons for eventual perception and interpretation.     
e. ______The action potential is propagated along the peripheral process of the neuron.

Verified step by step guidance

1. Step 1: Begin by identifying the initial event in the sequence. The detection of somatic sensation starts when a stimulus triggers an action potential in the sensory receptor. This corresponds to option 'c'.
2. Step 2: Once the action potential is generated, it is propagated along the peripheral process of the sensory neuron. This corresponds to option 'e'.
3. Step 3: The action potential then reaches the posterior root ganglion, where it is transferred to the central process of the sensory neuron. This corresponds to option 'b'.
4. Step 4: The central process transmits the action potential to a second-order sensory neuron located in the central nervous system (CNS). This corresponds to option 'a'.
5. Step 5: Finally, the signal is transferred to other CNS sensory neurons for further processing, perception, and interpretation. This corresponds to option 'd'.

Key Concepts

Somatic Sensation

Somatic sensation refers to the body's ability to perceive stimuli from the environment through sensory receptors. This includes sensations such as touch, temperature, pain, and proprioception. Understanding somatic sensation is crucial for grasping how the body interacts with its surroundings and how these signals are processed by the nervous system.

Action Potential

An action potential is a rapid electrical signal that travels along the axon of a neuron, triggered by a stimulus. It is essential for the transmission of sensory information from peripheral receptors to the central nervous system (CNS). The generation and propagation of action potentials are fundamental processes in neural communication, allowing for the relay of sensory information.

Central Nervous System (CNS)

The central nervous system consists of the brain and spinal cord, serving as the main control center for processing sensory information. It interprets signals received from sensory neurons and coordinates responses. Understanding the role of the CNS is vital for comprehending how sensory information is integrated and perceived, leading to appropriate reactions to stimuli.