| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Excision of head structure | Is a | True | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on pineal gland | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Ligation of venom duct | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Autogenous graft of rib cartilage to face | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on face | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Incision of face | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on tongue | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on sublingual duct | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Excision of benign lesion of scalp and neck | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Excision of scent gland of head | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Destruction of lesion of conjunctiva | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Destruction of benign facial lesions, first lesion | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Incisional discission of anterior hyaloid | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Incision of cheek | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Encephalocentesis | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Excision of congenital preauricular cyst, fistula or sinus | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Stripping of cerebral meninges | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Galeaplasty | Is a | True | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Incision of pineal gland | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Fetal decapitation | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Incision and drainage of lesion of tongue | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Chemexfoliation of face | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Intracranial microdissection | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Reconstruction of cornea | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Fine needle aspiration biopsy of Rathke's pouch | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Pulpectomy | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Transplant of hair follicles to scalp | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Mastoid myoplasty | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Debridement of beak | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Radical excision of floor of mouth | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Revision of orbital implant | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Functional endoscopic sinus surgery, total | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Crown lengthening, hard and soft tissue | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Transection of greater occipital nerve | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Drainage of peritonsillar tissues | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Ventriculopuncture | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Intermediate delay of small flap at scalp | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Transplantation of adrenal gland tissue to cerebral ventricle | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Transplantation of temporalis muscle | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Clipping of beak | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on pituitary gland | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Dermabrasion of facial scars | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Reduction of fracture of skull | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Excisional biopsy of pituitary gland by transfrontal approach | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Excision of malignant lesion of scalp and neck | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Removal of pleurothecal shunt | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Repair of nose | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Biopsy of muzzle | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Debridement of forehead lacerations | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Keratocentesis | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Cannulation of nasal sinus by puncture | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Dentoalveolar bone replacement graft, multiple sites, including flap entry and closure | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Reconstruction of temporomandibular joint | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Destruction of lesion of eyebrow | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Arthrotomy of temporomandibular joint | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Endarterectomy of intracranial artery | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Biopsy of cornea | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Destructive procedure of lens | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Repair of tongue | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Gingival flap procedure, including root planing, per quadrant | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Cryosurgical epilation of eyebrow | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on eyeball | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Functional endoscopic sinus surgery, limited | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Local excision of lesion of nose | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| External cephalic version with tocolysis | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on submaxillary duct | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on oropharynx | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Incision and drainage of Ludwig's angina | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Biopsy of oropharynx | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Destructive procedure of salivary gland | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Control of epistaxis by ligation of artery | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on bone of skull | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on uvula | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Tattooing of skin of nose | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Repair of eyebrow | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Transplantation of dura | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on parotid gland | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Dentoalveolar bone replacement graft, single site, including flap entry and closure | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Division of blood vessels of cornea | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Partial rhinectomy | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Enucleation of cyst of salivary gland | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Excision of lesion from soft tissue of face | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Corneal transplant | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Control of oropharyngeal hemorrhage | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Destructive procedure of cornea | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Suprahyoid lymphadenectomy | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Grafting of palate | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Destructive procedure on brain | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Incision of cornea | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Intracranial gas endarterectomy | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Nasolacrimal anastomosis | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Repair of pituitary gland | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Trapping of cerebral aneurysm | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Removal of lumbosubarachnoid shunt | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Diagnostic procedure on facial bone | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Operation on the ear | Is a | True | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Incision of pituitary gland | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Craniocervical spinal fusion | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Total rhinectomy | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Repair of ocular lens | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  | 
| Graft of nose | Is a | False | Operative procedure on head | Inferred relationship | Existential restriction modifier |  |