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The thumb is the first finger of the hand, next to the index finger. When a person is standing in the medical anatomical position (where the palm is facing to the front), the thumb is the outermost finger. The Medical Latin English noun for thumb is pollex (compare hallux for big toe), and the corresponding adjective for thumb is pollical. Definition = Thumb and fingers =The English word 'finger' has two senses, even in the context of appendages of a single typical human hand:Any of the five terminal members of the hand. Any of the four terminal members of the hand, other than the thumbLinguistically, it appears that the original sense was the first 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 stem 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 handHaving a dorsal surface that features hair and a nail, and a hairless palmar aspect with fingerprint ridgesThe thumb contrasts with each of the other four fingers by being the only one that:Is opposable to the other four fingersHas two phalanges rather than threeHas greater breadth in the distal phalanx than in the proximal phalanxIs attached to such a mobile metacarpus (which produces most of the opposability)and hence the etymology of the word: 'tum' is Proto-Indo-European for 'swelling' (cf 'tumour' and 'thigh') since the thumb is the stoutest of the fingers. Opposition and apposition = Humans =Anatomists and other researchers focused on human anatomy have hundreds of definitions of opposition. Some anatomists restrict opposition to when the thumb is approximated to the fifth finger (little finger) and refer to other approximations between the thumb and other fingers as apposition. To anatomists, this makes sense as two intrinsic hand muscles are named for this specific movement (the opponens pollicis and opponens digiti minimi respectively). Other researchers use another definition, referring to opposition-apposition as the transition between flexion-abduction and extension-adduction, the side of the distal thumb phalanx thus approximated to the palm or the hand's radial side (side of index finger) during apposition and the pulp or 'palmar' side of the distal thumb phalanx approximated to either the palm or other fingers during opposition.

This GIF Bitmap Image Thumb Free HQ Image is a part of Thumbs Category in Medical Folder. Thumb Free HQ Image has a Resolution of 12x15 Pixels. Thumb Free HQ Image is of .gif (Graphics Interchange Format) Format. It's Size is 241.0B. This GIF has been Downloaded 90 times till now. Thumb Free HQ Image was Added on 03-07-2021. Download Thumb Free HQ Image by clicking the button below:

Image Name: Thumb Free HQ Image
Image Category: Medical / Thumbs
Date Added: 03-07-2021
Resolution: 12x15

Format: GIF
Downloads: 90
Views: 179
Size: 241.0B

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