8 types distinguished by morphology of secretory portion

8 types distinguished by morphology of secretory portion (tubular [coiled versus straight] versus acinar [simple versus compound]) and branching versus straight excretory portions (which may also secrete bicarbonate)

simple tubular: large intestine: single, straight; lined by goblet (mucous) cells
simple coiled tubular: sweat glands; terminal secretory portion lined by simple cuboidal epithelium; followed by nonsecretory (excretory) duct lined by stratified cuboidal epithelium
simple branched tubular: stomach; secretory portions converge into unbranched duct (wider diameter); lined by mucus-secreting cells.

simple acinar: rounded secretory unit; pockets in epithelial surface; secretory cells (e.g., mucus-secreting glands of penile urethra)

simple branched acinar: several acini emptying into single excretory duct (stratified epithelium); sebaceous gland

compound branched tubular: = duct branched; secretory portions tubular and branched; duodenal (Brunner's) glands

compound acinar: secretory units are acinar and drain into branched ducts; pancreas; branched excretory ducts of increasing diameter lined by simple cuboidal epithelium

compound tubulo-acinar: 3 types secretory units: branched tubular; branched acinar (serous cells); branched tubular (mucous cells) with acinar end pieces ([serous] demilunes); submandibular salivary gland

myoepithelial cells: sometimes embedded in basement membrane; may aid secretion of acinus glands

striated ducts: striations due to mitochondria lined up along folds of basal membrane; transport Na and bicarbonate; cells high cuboidal to columnar
intercalated ducts come between acini or acini and striated ducts; cells low cuboidal