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60 Veterinary Histology of Domestic Mammals and Birds

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2.49 Sublingual gland (ox). Mixed secretory units of seromucous glands are characterised by a predominantly
lightly staining mucous portion and an acidophilic serous component (serous demilune). Haematoxylin and
eosin stain (x480).

2.50 Sublingual gland (ox). The cap-like arrangement of the serous component of mixed (seromucous) glands
can be demonstrated clearly using the Azan staining method, in which the mucous portions stain blue. Azan
stain (x400).

recent findings based on electron microscopy techniques secretion (e.g. the serous secretory product of the parotid
suggest that these cells occupy the same row as the mucous gland of the horse). Heterocrine glands contain different
cells. types of secretory units and produce a mixed secretion
In some cases, mixed glands contain cells that produce (e.g. mixed secretion of the sublingual gland of the ox).
both serous and mucous secretory product. Germinal epithelia and epithelial tissue featuring spe-
Based on the chemical composition of the secretion, cialisations for sensation, excretion and transport are
exocrine glands may also be classified as homocrine or described in subsequent relevant chapters.
heterocrine. Homocrine glands produce only one type of

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