Peripheral Nervous System And Synaptic Pharmacology 1: Organisation Of The Pns

The correct answer is Afferent, Efferent, and Interneuron. Afferent neurons carry sensory information from the body to the central nervous system, while efferent neurons transmit motor signals from the central nervous system to the muscles and glands. Interneurons are responsible for transmitting signals between neurons within the central nervous system. This classification represents the three main types of neurons that work together to transmit and process information throughout the body.

The 12 thoracic nerves go to the chest and abdominal wall. These nerves originate from the thoracic region of the spinal cord and branch out to innervate the muscles, skin, and organs in the chest and abdominal area. They play a crucial role in providing sensory and motor function to these regions, allowing for movement, sensation, and control of the muscles and organs in the chest and abdomen.

The 8 cervical nerves are responsible for innervating the neck, shoulder, arm, and hand. These nerves emerge from the cervical region of the spinal cord and branch out to provide motor control and sensory information to these areas. This allows for movement, sensation, and coordination in the upper limbs.

The input zone of a neuron is the part where incoming signals from other neurons are received. This is where the neuron integrates and processes the information it receives from other neurons. These incoming signals can be excitatory or inhibitory, and they determine whether the neuron will generate an action potential or not. The input zone plays a crucial role in the overall functioning of the neuron as it receives and integrates signals from multiple sources before deciding whether to transmit the information further or not.

Motor neurons are responsible for transmitting information from the central nervous system (CNS) to effector organs or other neurons. Effector organs are responsible for carrying out responses to stimuli, such as muscles contracting or glands secreting hormones. Therefore, motor neurons play a crucial role in coordinating and controlling voluntary and involuntary movements, as well as regulating bodily functions. They serve as the communication pathway between the CNS and the rest of the body, allowing for the execution of motor commands.

Interneurons are actually found throughout the nervous system, not exclusively in the CNS. They are responsible for transmitting information between sensory and motor neurons, and can be inhibitory or excitatory. Additionally, interneurons can be highly specialized, performing specific functions in neural circuits. Therefore, the statement that interneurons account for approximately 1% of all neurons is false.

The conducting zone of a neuron refers to the part that transmits an action potential in an undiminishing fashion, often over long distances. This means that it is responsible for carrying electrical signals from one end of the neuron to the other without any loss of strength or intensity. This is crucial for the efficient transmission of information throughout the nervous system.

The correct flow of sensory information starts with the receptor, which detects the sensory stimulus. The receptor then sends the information to the afferent neuron, which carries the sensory information towards the central nervous system (CNS). In the CNS, the sensory information is processed by the interneuron. The processed information is then sent to the efferent neuron, which carries the motor response from the CNS to the effector organ, where the response is executed.

The PNS does not include the spinal cord. The spinal cord is part of the CNS (central nervous system), not the PNS (peripheral nervous system). The PNS consists of neuronal and sensory cells and acts as the interface between the CNS and the environment. It includes 43 pairs of nerves, which are divided into 12 pairs of cranial nerves and 31 pairs of spinal nerves.

The 5 lumbar nerves go to the hips and legs. The lumbar nerves are part of the spinal nerves that originate from the lumbar region of the spine. These nerves branch out and innervate various muscles, skin, and organs in the lower body. The nerves in the lumbar region specifically supply motor and sensory information to the hips and legs, allowing for movement, sensation, and control in this area of the body.

The coccygeal nerve is responsible for innervating the genitals and lower gastrointestinal tract. This nerve provides sensory and motor functions to these areas, allowing for the perception of touch, pain, and temperature, as well as controlling the movement and function of the muscles in the lower gastrointestinal tract.

The output zone of a neuron is the part that releases the neurotransmitter which influences other cells. This is where the neuron sends signals to other neurons or cells in order to transmit information. The release of neurotransmitters allows for communication between neurons and is essential for the functioning of the nervous system.

The correct answer is that the Vegus Nerve goes through the peripheral nervous system to the thoracic organs and gut. The Vegus Nerve, also known as the Vagus Nerve, is the longest cranial nerve and is responsible for regulating various bodily functions such as heart rate, digestion, and respiratory functions. It innervates the thoracic organs, which include the heart and lungs, as well as the gut or gastrointestinal tract. The peripheral nervous system is the part of the nervous system that connects the central nervous system to the rest of the body, including the organs. Therefore, the Vegus Nerve travels through the peripheral nervous system to reach the thoracic organs and gut.

The trigger zone of a neuron is the part where action potentials are initiated. This is where the incoming signals from other neurons are integrated and if the combined signal reaches a certain threshold, an action potential is generated. The trigger zone plays a crucial role in the transmission of signals within the neuron, as it determines whether or not an action potential will be produced and propagated along the axon.

The 5 sacral nerves are responsible for innervating the genitals and lower gastrointestinal tract. These nerves provide sensory and motor functions to these areas, allowing for the transmission of signals and control of movements.

Sensory neurons are responsible for transmitting information from sensory receptors, which are located at their peripheral end, to the central nervous system (CNS). This allows the brain and spinal cord to receive and process sensory information from the external environment or internal body conditions. Sensory neurons are highly specialized cells that play a crucial role in detecting and relaying sensory stimuli such as touch, temperature, pain, and sound. They account for 99% of all neurons in the body, highlighting their significance in sensory processing and perception.