Question

Sympathetic nerves in mammals arise from
A. Sacral region
B. Cervical region
C. Thoracolumbar region
D. 3rd, 7th, 9th, and 10th cranial nerves.

Answer 1

The sympathetic nervous system is abbreviated as SNS. It is one of the divisions of the autonomic nervous system and the parasympathetic nervous system. The unconscious actions of the body are regulated by the sympathetic nervous system of the body.

Complete answer:
The nervous system is found in animals with complex body structures. The function of the nervous system is to regulate the coordination of actions and sensory information by transmitting and receiving to and fro from the body. The nervous system is divided into two main parts called the central nervous system (CNS) and peripheral nervous system (PNS). The peripheral nervous system is further classified as the autonomic nervous system, somatic nervous system, and enteric nervous system. The sympathetic nervous system and parasympathetic nervous system together form the autonomic nervous system. The primary function of the sympathetic nervous system is to stimulate the body’s fight and flight response. Two types of neurons are responsible for the conduction of signal impulses in sympathetic nervous systems. They are preganglionic neurons and postganglionic neurons. These neurons originate from the thoracolumbar region of the body. Sympathetic nerves are made up of efferent fibers which are derived from the thoracic and lumbar regions of the spinal cord. These nerves are responsible for the activation of involuntary action. The post-ganglion that originates from the sympathetic chain innervates and impacts the effector organ. Therefore, sympathetic nerves in mammals arise from the thoracolumbar region that is T1- T2.

So, option C is the correct answer.

Note:
The sympathetic nervous system of the body acts as an antagonist to the parasympathetic nervous system of the body. It is active at the basic level for the purpose of maintaining homeostasis. Preganglionic neurons are shorter and postganglionic neurons are long in size. The sympathetic nervous system is responsible for the hormonal stress response of the body.