Definition is a rhetorical mode that can be used in something smaller or shorter than a full paper. You can use extended definition for several paragraphs only in a paper of much greater length. You also can add to a paper a one-paragraph definition--like a brief encyclopedia definition.
Depending upon location, neural crest cells give rise to most of the peripheral nervous system, as well as various non-neural tissues, like craniofacial bone and cartilage, the thymus and parathyroid glands, and the cardiac outflow tract â in short, all of the tissues that are affected in DiGeorge syndrome.
Related tumors. While most chromaffin cells reside in the adrenal glands, small clusters of these cells are also located in the heart, head, neck, bladder, back wall of the abdomen and along the spine. Tumors in these chromaffin cells, called paragangliomas, may result in the same effects on the body. 1  Symptoms.2  Risk factors.hey do understand that the tumor develops in specialized cells, called chromaffin cells, located in the center of an adrenal gland. These cells produce and release certain hormones, primarily adrenaline (epinephrine) and noradrenaline (norepinephrine).