part_of part of part of has part has part has_part duct exocrine system exocrine gland EMAPA:35327 CALOHA:TS-2012 BTO:0000765 MESH:D005088 GAID:34 glandula exocrina SCTID:115976003 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 FMA:9596 EHDAA2:0003097 Wikipedia:Exocrine_gland MA:0002564 NCIT:C12712 AEO:0000097 uberon UBERON:0002365 UMLS:C0015282 ducted gland gland