part of part of tributary of tributary of system head blood vessel cavernous sinus aqueous drainage system canal of Schlemm sinus venosus of sclera UMLS:C0229108 The vascular structure encircling the anterior chamber of the eye, through which the aqueous humor is returned to the blood circulation. EMAPA:37456 scleral sinus UBERON:0004029 NCIT:C32256 Schlemm's canal FMA:51873 Wikipedia:Schlemm's_canal ZFA:0005829 scleral venous sinus sinus venosus sclerae SCTID:280605006 venous dural sinus craniocervical region vein