The thumb is the medial-most digit of the hand. The English adjective for thumb is pollical.
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The Panda's Thumb (blog) - Wikipedia, the free encyclopedia
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Good luck on the road, guys, I like where this blog series is going! ... Heather Currie Reporting: A big hello to all you Green Thumb Blog watchers out there. ...www.greenthumbtheatre.blogspot.com/The thumb is the medial-most digit of the hand. The English adjective for thumb is pollical.
Bones
The thumb consists of three bones:
- distal phalanx (of the first digit)
- proximal phalanx (of the first digit)
- first metacarpal
Muscles


The extensor pollicis longus tendon and extensor pollicis brevis tendon form what is known as the anatomical snuff box (an indentation on the lateral aspect of the thumb at its base) The radial artery can be palpated anteriorly at the wrist(not in the snuffbox) In the hand, the abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, and opponens pollicis form the thenar eminence.
Hitchhiker's thumb
As one of five digits, and as companion to four fingers
The English word "finger" has two senses, even in the context of appendages of a single typical human hand:
- The four digits, not including the thumb.
- Any of the five digits.
Linguistically, it appears that the original sense was the broader of these two: penkwe-ros (also rendered as penqrós) was, in the inferred Proto-Indo-European language, a suffixed form of penkwe (or penqe), which has given rise to many Indo-European-family words (tens of them defined in English dictionaries) that involve or flow from concepts of fiveness.
The thumb shares the following with each of the (other) four fingers:
- Having a skeleton of phalanges, joined by hinge-like joints that provide flexion toward the palm of the hand
- Having a "back" surface that features hair and a nail, and a hairless palm-of-the-hand side with fingerprint ridges instead
The thumb contrasts with each of the (other) four by being the only finger that:
- Is opposable
- Has two phalanges rather than three
- Has its inmost phalanx so close to the wrist
- Has much greater breadth and stubby proportions
- Is attached to such a mobile metacarpus (which produces most of the opposability)
Grips
Typical interdigital grips include the tips of thumb and second finger (forefinger/index finger) holding a pill or other small item, or thumb and sides of second and third fingers holding a pen or pencil.
Origin of the Human thumb
The evolution of the opposable or prehensile thumb is usually associated with Homo habilis, the forerunner of Homo sapiens. This, however, is the suggested result of evolution from Homo erectus (around 1 mya) via a series of intermediate anthropoid stages, and is therefore a much more complicated link.

























