Bean knowledge: the muscle that controls the finger is not on the finger.

Human hands can probably be regarded as a typical example of fine muscle control. With flexible hands, many complex tasks can be accomplished. However, the fingers themselves are not "muscular". They control the muscles of the fingers, and their main parts do not grow on the fingers.

so, how do fingers move? This is somewhat similar to the string puppet. These muscles that control the fingers grow on the palms and the front wall, and they are connected to the fingers through long tendons, pulling the fingers for movement.

how remote can such control be? As an example, let's take a look at a muscle that controls finger extension: (Extensor digitorum muscle)

this control method is very beneficial so that the finger itself can be born more slim and dexterous, and the muscles on the front wall and palm can provide good strength support.

We can see that many Bulk Up practitioners' arms can be very strong, but their wrists and fingers look the same as normal people:

this is also because the fingers and wrists are mainly tendons, not the "body" part of the muscles responsible for contraction, and exercise does not make the tendons thicken significantly.

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in addition, although each finger looks independent, its degree of freedom is still limited. For example, two joints on one finger generally bend and extend at the same time. It's not impossible, but it's not easy to straighten one and bend the other. In addition, it is not easy for people like the middle finger and ring finger to stand upright (for more details, please read the original text).

however, the thumb is an exception here. The human thumb is on a different plane from the other four fingers, and it has a lot of exclusive control muscles, which makes it easy to flexion, extend, and adduct independently. And this structure is essential to complete the grasping action, without it, you can't even use the game handle ~

because the thumb is very important, so in the injury identification, the missing thumb will be considered to be a more serious injury than other fingers. To restore function, doctors sometimes amputate toes and transplant them into hands with missing thumbs. This operation may sound strange, but it can improve the patient's life a lot.