Head and neck
Skeletal variations
* Occipitalization of the atlas * Basilar tubercle of clivus * Tubercle at the anterior rim of foramen magnum * Clivus bony canal * Condylus tertius * Epipteric bone * Foramen tympanicum * Ossified petrosphenoid ligament * Ossification anomalies of the atlas (C1) * Craniopharyngeal canal * Canalis basilaris medianus * Fossa navicularis magna * Transverse basilar fissure (Saucer's fissure) (see Clivus) * Arcus praebasiocipitalis * Stafne bone cavity * Arcuate foramen * Ossiculum terminale (of dens) * Os odontoideum * Intermediate condylar canal * Innominate canal of Arnold * Arcus praebasiocipitalis * Inca bone * Haller cell * Sphenoethmoidal air cell (Onodi cell) (see Sphenoid sinus) * Accessory maxillary ostium (see Maxillary sinus) * Thyroid foramen (see Thyroid cartilage) * Collateral eminence * Wormian bonesMuscular variations
* Levator glandulae thyroidea (levator muscle of thyroid gland) * Accessory belly of digastric muscle (see Digastric muscle) * Atlantomastoid muscle * Styloauricularis muscle * Transversus nuchae muscle * Pterygoideus proprius muscle * Levator claviculae muscle * Levator glandulae thyroidea muscle * Cleidoatlanticus muscle * Cleidocervical muscle * Cleidofascialis muscle * Cleidohyoideus muscle * Cleidomastoideus muscle * Cleido-occipitalis cervicalis muscle * Cricocorniculate muscle * Cricohyoid muscle (variation of thyrohyoid) * Sternoclavicularis anticus muscle * Styloauricularis muscleVascular variations
* Persistent primitive olfactory artery * Artery of Percheron * Stapedial artery * Thyroid ima artery * Fourth thyroid vein (of Kocher) (see Inferior thyroid veins) * Falcine sinus * Hypoglossal artery *Persistent left superior vena cava * Trigeminal arteryNervous variations
* Trigeminal nerve duplication * Aberrant facial nerve course * Accessory hypoglossal nerveOther variations
* Preauricular sinus * Supernumerary nipple * Darwin's tubercle *Vertebral column and ribs
Skeletal variations
* Atlanto-occipital fusion (see Atlanto-occipital joint) * Butterfly vertebrae * Cervical ribs * Coccygeal ribs * Block vertebrae * Sagittal cleft vertebrae * Lumbosacral transitional vertebrae * Split cord malformation * Sternal cleft * Spondylolisthesis * Oppenheimer's ossicle * Spondylolysis * Sprengel's deformityThorax
Skeletal variations
* Sternal foramen and xiphoid foramen * Episternal ossicles * Manubriosternal fusion (seeMuscular variations
* Sternalis muscle (rectus thoracis) * Costocoracoideus muscleOther variations
* Azygos lobe of the lung * Tracheal bronchus (see Bronchus) * Cardiac bronchus (see Bronchus) * Supernumerary lung fissures * Horseshoe lungUpper limb
Skeletal variations
* Bifurcated clavicle * Coracoclavicular joint * Os acromiale (see Acromion) * Carpal coalition * Carpal boss * Bipartite capitate * Supracondylar process of the humerus * Scapular foramina and tunnelsMuscular variations
* Accessory subscapularis muscle * Gantzer's muscle (see Flexor pollicis longus muscle) * Chondroepitrochlearis muscle (see Pectoralis major) * Coracocapsularis muscle * Costodeltoideus muscle * Axillary arch muscle * Epitrochleoanconeus (anconeous epitrochlearis) muscle * Extensor medii proprius muscle * Extensor digitorum brevis manus muscle * Extensor indicis et medii communis muscle * Extensor pollicis et indicis communis muscle * Extensor carpi radialis tertius (extensor carpi radialis accessorius) muscle * Linburg-Comstock variation (conjoint flexor pollicis longus and flexor digitorum profundus of the index) * Palmaris profundus muscle * Flexor carpi radialis profundus muscle * Ulnaris quinti muscle * Pisiuncinatus muscle (pisohamatus) * Sternohumeralis muscle * Sternochondrocoracoideus muscle * Subscapularis minor muscle * Tensor semivaginae articulations humeroscapularis muscle * Thoracobrachialis muscleVascular variations
* Alar thoracic artery * Median artery * Superficial ulnar artery * Variation of the basilic veinNervous variations
* Bifid median nerve (seeOther variations
* Accessory nail of the fifth toe * Osborne's ligament * Struthers' ligamentLower limb
Skeletal variations
* Femoral anteversion/retroversion * Os tibiale externum * Fabella (popliteal sesamoid) * Calcaneonavicular coalition * Accessory navicula * Talocalcaneal coalition * Cyamella (popliteal fabella) * Sesamoid bone of the second, third, fourth, and fifth finger * Talus accessorius * Os trigonumMuscular variations
* Accessory soleus muscle * Accessory popliteus muscle *Vascular variations
* Marginal artery of the colon * Corona mortis (see Obturator artery)Nervous variations
* Sciatic nerve variations in relation to the piriformis muscleAbdomen
Muscular variations
* Interfoveolar muscle * Saphenous muscle * Pubotransversalis muscleVascular variations
* Arc of Bühler * Third mesenteric artery * Marginal artery of the colon (of of Drummond)Other variations
* Accessory spleen * Annular pancreas * Bifid pancreas tail * Double common bile duct * Agenesis of vermiform appendix (see Appendix (anatomy)) * Colon duplication * Accessory pancreatic duct * Pancreas divisum * Gastropancreatic ligamentPelvis
Vascular variations
* Uterine artery anastomoses variationsOther variations
* Bladder exstrophy * Renal artery anomalies * Splenogonadal fusion * SupernumeraryReferences