where are the cell bodies of somatic motor/efferent fibers located
Motor neuron Somatic motor neurons, which originate in the central nervous system, project their axons to skeletal muscles [4] (such as the muscles of the limbs, abdominal, and intercostal muscles), which are involved in locomotion .
Axoplasmic transport The vast majority of axonal proteins are synthesized in the neuronal cell body and transported along axons. Axonal transport occurs throughout the life of a neuron and is essential to its growth and survival. Microtubules (made of tubulin) run along the length of the axon and provide the main cytoskeletal "tracks" for transportation. Kinesin and dynein are motor proteins that move cargoes in the anterograde (forwards from the soma to the axon tip) and retrograde (backwards to the soma (cell body)) directions, respectively. Motor proteins bind and transport several different cargoes including mitochondria, cytoskeletal polymers, autophagosomes, and synaptic vesicles containing neurotransmitters.[1]