A gland that secretes products (excluding hormones and other chemical messengers) into ducts (duct glands) which lead directly into the external environment[WP]. Typical exocrine glands include sweat glands, salivary glands, mammary glands, stomach, liver, pancreas.

Currently this is logically defined by the system it belongs to, but a better system may be base this on presence/absence of ducts. However, the dual nature of the liver should be taken into consideration here. Consider adding subclasses

ducted gland, glandula exocrina

uberon

UBERON:0002365

http://purl.obolibrary.org/obo/uberon.owl, http://purl.obolibrary.org/obo/cl.owl

• exocrine system

• secretion of exocrine gland

• exocrine cell
• acinus of exocrine gland