| cardiovascular system | http://purl.obolibrary.org/obo/MAT_0000016 | cardiovascular system | |
| carotid artery | http://purl.obolibrary.org/obo/MAT_0000501 | carotid artery | |
| carpel | http://purl.obolibrary.org/obo/MAT_0000516 | carpel | |
| cartilage | http://purl.obolibrary.org/obo/MAT_0000189 | cartilage | |
| caudate nucleus | http://purl.obolibrary.org/obo/MAT_0000513 | caudate nucleus | |
| cecum | http://purl.obolibrary.org/obo/MAT_0000288 | caecum | |
| C elegans development (WBIs) | http://purl.obolibrary.org/obo/MAT_0000429 | C elegans development (WBIs) | |
| C elegans (WBbt) | http://purl.obolibrary.org/obo/MAT_0000382 | C elegans (WBbt) | |
| central nervous system | http://purl.obolibrary.org/obo/MAT_0000457 | central nervous system | |
| cerebellum | http://purl.obolibrary.org/obo/MAT_0000110 | cerebellum | |
| cerebral cortex | http://purl.obolibrary.org/obo/MAT_0000108 | cerebral cortex | |
| cerebrospinal fluid | http://purl.obolibrary.org/obo/MAT_0000499 | cerebrospinal fluid | |
| cervix | http://purl.obolibrary.org/obo/MAT_0000292 | cervix | |
| chaeta | http://purl.obolibrary.org/obo/MAT_0000152 | sensory bristle | |
| chemosensory sensory organ | http://purl.obolibrary.org/obo/MAT_0000139 | nose | |
| child | http://purl.obolibrary.org/obo/MAT_0000402 | juvenile stage | |
| chondrocranium | http://purl.obolibrary.org/obo/MAT_0000149 | craniofacial skeleton bone | |
| chordotonal organ | http://purl.obolibrary.org/obo/MAT_0000209 | chordotonal organ | |
| circulating cell | http://purl.obolibrary.org/obo/MAT_0000083 | blood cells | |
| circulatory system | http://purl.obolibrary.org/obo/MAT_0000016 | cardiovascular system | |
| claw | http://purl.obolibrary.org/obo/MAT_0000158 | nail | |
| cloaca | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| cloacal chamber | http://purl.obolibrary.org/obo/MAT_0000042 | anal region | |
| cochlea | http://purl.obolibrary.org/obo/MAT_0000144 | cochlea | |
| colon | http://purl.obolibrary.org/obo/MAT_0000526 | colon | |
| common carotid artery | http://purl.obolibrary.org/obo/MAT_0000501 | carotid artery | |
| connecting stalk | http://purl.obolibrary.org/obo/MAT_0000280 | umbilical cord | |
| connective tissue | http://purl.obolibrary.org/obo/MAT_0000301 | connective tissue | |
| corm | http://purl.obolibrary.org/obo/MAT_0000368 | corm | |
| corpus allatum | http://purl.obolibrary.org/obo/MAT_0000210 | corpus allatum | |