Final answer:
The structure shown in the figure, emerging from the ventrally-located basal plate, is the ventral horn, which contains motor neurons of the spinal cord.
Step-by-step explanation:
The embryonic brain stem and spinal cord contain the basal plate, which is a developmental region of the spinal cord. The basal plate develops into the ventrally-located structures of the spinal cord, such as the anterior (ventral) horns of the gray matter. It is involved in establishing motor functions within the central nervous system. Given that the basal plate is ventrally located and associated with motor neuron development, the structure in question that emerges from it is the ventral horn. Each segment of the spinal cord has a pair of ventral horns, which contain the cell bodies of motor neurons that send their axons out to the muscles and glands.