part of part of has part has part bounding layer of bounding layer of tendon tendon sheath UBERON:0000304 BTO:0000051 NCIT:C96299 SCTID:361885006 TODO - add layer relations. 'tendon sheath' GAT in FMA. vagina tendinis FMA:45087 synovial tendon sheath UMLS:C0224856 Wikipedia:Tendon_sheath A layer of membrane around a tendon. It has 2 layers: synovial sheath + fibrous tendon sheath. FMA:76715 organ component layer synovial membrane of synovial tendon sheath fibrous membrane of synovial tendon sheath