The first neuron of the efferent motor pathway of the sympathetic and parasympathetic divisions has its cell body in the nervous system.

The first neuron of the efferent motor pathway of the sympathetic and parasympathetic divisions has its cell body in the Central Nervous System.

Here's the step by step explanation:

1. The nervous system is divided into two main parts: the Central Nervous System (CNS) and the Peripheral Nervous System (PNS). The CNS includes the brain and spinal cord, while the PNS includes all the nerves that branch out from the brain and spinal cord.

2. The PNS is further divided into the somatic nervous system and the autonomic nervous system. The autonomic nervous system is then divided into the sympathetic and parasympathetic divisions.

3. The sympathetic and parasympathetic divisions are part of the autonomic nervous system, which controls involuntary functions like heart rate, digestion, respiratory rate, etc.

4. The efferent motor pathway refers to the path that signals take from the CNS to the rest of the body. This pathway is used to transmit signals from the brain to cause an effect in the body, like muscle movement.

5. The first neuron in this pathway, known as the preganglionic neuron, has its cell body in the CNS. This neuron sends a signal to the second neuron, the postganglionic neuron, which then carries the signal to the target organ or tissue.

So, in summary, the first neuron of the efferent motor pathway of the sympathetic and parasympathetic divisions has its cell body in the Central Nervous System.