middle finger middle finger the middle finger, long finger, second finger, third finger, toll finger or tall man is the third digit of the human hand, located between the index finger and the ring finger. it is typically the longest digit. in anatomy, it is also called the third finger, digitus medius, digitus tertius or digitus iii. middle fingermiddle finger of the left handdetailsarteryproper palmar digital arteries, dorsal digital arteriesveinpalmar digital veins, dorsal digital veinsnervedorsal digital nerves of radial nerve, proper palmar digital nerves of median nerveidentifierslatindigitus iii manus, digitus medius manus, digitus tertius manusta98a01.1.00.055ta2153fma24947anatomical terminology in western countries, extending the middle finger (either by itself, or along with the index finger in the united kingdom: see v sign) is an offensive and obscene gesture, widely recognized as a form of insult, due to its resemblance of an erect penis, it is known, colloquially, as "flipping the bird", "flipping (someone) off", or "giving (someone) the finger". the middle finger is often used for finger snapping together with the thumb.