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.
Lymphocytes can be seen in low numbers in nearly all effusions. An increased number is found in chylus. In lymphomas the lymphoid cells show evidence of malignancy. Mast cells are rarely found in pleural effusions, but seen in low numbers during inflammations and in high numbers by intra-thoracic mast cell tumours. Eosinophilic granulocytes may be found in cases of pneumothorax, heart worm disease or hypersensitivity reactions.