| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Vitreous and retina, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Choroid and retina, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Iris and ciliary body (combined site) (body structure) | Is a | False | Combined site | Inferred relationship | Some |  | 
| Conjunctiva and cornea, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Eye and lacrimal gland, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Conjunctiva and lacrimal sac, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Lacrimal sac and nose, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Endolymphatic sac and subarachnoid space, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Hematopoietic and reticuloendothelial systems, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Thorax, mediastinum and diaphragm, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Upper and lower extremities, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Both upper and lower extremities, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Upper extremity and shoulder, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Right upper extremity and shoulder, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Left upper extremity and shoulder, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Right lower extremity and pelvic tissues (combined site) | Is a | False | Combined site | Inferred relationship | Some |  | 
| Left lower extremity and pelvic tissues (combined site) | Is a | False | Combined site | Inferred relationship | Some |  | 
| Nasopharynx and esophagus, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Larynx and trachea, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Larynx, trachea and bronchus, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Larynx and pharynx, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Trachea and esophagus, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Trachea and bronchus, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Trachea and skin, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Trachea and aorta, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Bronchus and pleura, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Bronchus and esophagus, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Bronchus and liver, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Bronchus and skin of thorax, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Bronchus and abdominal viscera, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Bronchus and aorta, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Bronchus and alveolus, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Bronchus and lung, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pleura and pleura, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pleura and pericardium, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pleura and peritoneum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pleura and diaphragm, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pleura and liver, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pleura and chest wall, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pericardium and pericardium, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pericardium and mediastinum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Heart and lung, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Heart and pericardium (combined site) (body structure) | Is a | False | Combined site | Inferred relationship | Some |  | 
| Blood vessel and blood vessel, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Artery and vein, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Artery and artery, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Iliac and femoral arteries, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Femoral artery and femoral artery, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Carotid artery and carotid artery, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Vertebral and basilar arteries, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Aorta and aorta, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Aorta and coronary artery, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Aorta and pulmonary artery, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Aorta and femoral artery, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Aorta and iliac artery, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Aorta and duodenum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Aorta and left ventricle, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Femoral and iliac veins, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Femoral and popliteal arteries, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Vein and vein, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Portal vein and inferior vena cava, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Portal vein and splenic vein, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Lip, oral cavity and pharynx, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Gallbladder and duodenum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Esophagus and duodenum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Esophagus and stomach, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Esophagus and jejunum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Esophagus and aorta, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Esophagus and esophagus, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Stomach and jejunum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Stomach and colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Stomach and duodenum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Pyloric antrum and duodenum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Stomach and small intestine, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Stomach and stomach, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Small intestine and small intestine, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Small intestine and colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Duodenum and common bile duct, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Duodenum and ileum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Duodenum and jejunum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Duodenum and duodenum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Duodenum and colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Ileum and colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Jejunum and colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Jejunum and jejunum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Ileum and rectum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Ileum and vagina, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Ileum and cecum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Ileum and transverse colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Ileum and sigmoid colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Ileum and ileum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Jejunum and cecum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Colon and colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Colon and rectum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Colon and cecum, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Cecum and sigmoid colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Colon and sigmoid colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Sigmoid colon and sigmoid colon, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Rectum and vagina, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Rectum and urinary bladder, CS | Is a | True | Combined site | Inferred relationship | Some |  | 
| Anus and rectum, CS | Is a | True | Combined site | Inferred relationship | Some |  |