1. A primitive cell derived from the neuroglia of the neural crest that develops into a cell of the adrenal medulla: In her medical class Susan learned about sympathetoblasts which were said to be very simple cells.

"Neuroglia" is the delicate network of branched cells and fibers that supports the tissue of the central nervous system.

2. The precursor of a sympathetic neuron, believed to be derived from the neural crest from where it migrates into the sympathetic ganglia (mass of nerve tissue existing outside the central nervous system which is the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, and nerves).

Homologous (similar in position, structure, function, or characteristics) though larger cells differentiate to form chromaffin cells (cells that stain readily with chromium salt) of organs like the adrenal medulla (inner portion of the adrenal gland).

The adrenal gland refers to either of two small, triangular, endocrine glands found above the kidneys. This gland is actually two fused organs, with one forming the inner core or medulla and the other forming an outer shell, or cortex. The cortex and medulla each secrete distinct kinds of hormones that regulate important bodily functions.

3. An embryonic cell that develops into a sympathetic nerve cell: A sympathoblast can also develop into a chromaffin cell.