List of anatomical variations

Accessory features

Bones

• Cervical rib
• Fabella
• Foramen tympanicum
• Supracondylar process of the humerus

  Arteries

• Median artery
• Hypoglossal artery

  Muscles

• Accessory soleus muscle
• Axillary arch
• Epitrochleoanconeus muscle - or anconeous epitrochlearis
• 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 muscle - or extensor carpi radialis accessorius
• Linburg-Comstock variation - or conjoint flexor pollicis longus and flexor digitorum profundus of the index
• Sternalis muscle - or rectus thoracis
• Psoas minor muscle
• Palmaris profundus muscle
• Styloauricularis muscle
• Transversus nuchae muscle

  Glands

• Accessory parotid gland
• Zuckerkandl's tubercle

  Organs

• Accessory spleen
• Azygos lobe of the lung
• Tracheal bronchus

  Other

• Accessory pancreatic duct
• Accessory nail of the fifth toe
• Darwin's tubercle
• Vein of foramen caecum
• Osborne's ligament
• Gastropancreatic ligament

  Lacking features

Muscles

• Risorius
• Psoas minor
• Missing or underdeveloped pectoralis major is called Poland's syndrome

  Other

• Appendix
• Agenesis of wisdom teeth

  Varying features

Bones

• Sesamoid bone of the second, third, fourth and fifth finger

  Muscles

• Absence of the risorius
• Absence of the palmaris longus
• Dividement of the piriformis

  Vasculature

• Artery of Percheron
• Double cystic artery
• Variation of basilic vein
• Median artery
• Thyroid ima artery
• Superficial ulnar artery
• Marginal artery of the colon

  Other

• Anisocoria
• Appendix
• Crease of the upper eyelid – having either a "single" or "double" eyelid
• *Epicanthic fold
• Lateral arcuate ligament
• Horseshoe kidney - also known as ren arcuatus