The poison is secreted in modified upper labial glands, or in a pair of large glands which are the homologues of the parotid salivary glands of other animals.
These changes are found in senile wasting, in metaplasia of cartilage, in many tumours, especially mixed growths of the parotid gland and testicle, and in various inflammatory granulation ulcers.
Of the salivary glands the parotid is by far the largest, elongated in the vertical direction, and narrower in the middle than at either end.
Typical abscess seen in a case of caseous lymphadenitis (parotid lymph node affected ).
None of the tumors was localized exclusively to the parotid gland, so the primary site was referred to as the " parotid region.