If you see a person's arm maybe you have seen the muscle. Well, what about the fingers? Have you ever seen people's fingers have muscles? Maybe the fingers don't have muscles? Then how can fingers work lifting all kinds of things if they don't have muscles? Check out the review here.
Is it true that fingers don't have muscles?
Muscles are the active means of human movement. Without muscles, humans cannot move the bones of their hands, feet and other parts freely. But what about fingers? As it turned out, fingers don't have muscle even though they can move .
Even though there are no muscles, the fingers can still work well. That's all because even though there are no muscles in the finger, there are 34 muscles in the palm of the hand and on the forearm (from around the elbow to the wrist) which makes the fingers work well.
The muscles that make the fingers can do various things. For example, opening the door, clapping, pointing with a finger, shaking hands, holding a bag, playing cellphone, and others.
The fingers and palms have a very complicated structure. Each hand has 27 bones and a number of joints. The total number of bones in the hand forms almost a quarter of the total body bone.
How do fingers move?
How can humans type, play the piano, and do things with fingers? All are centered on the brain. The muscles in the palms and forearms will work only when the brain tells them to do it. Indeed, so many important things must be done by hand. In fact, about a quarter of the brain has the task of controlling the movement of the muscles in the hand to move the fingers.
The brain that sends messages to nerves that are connected to the muscles of the palms and forearms. The message tells certain muscles to be tightened and other muscles to relax. So that the desired movement will occur.
The muscles in the palms and forearms attach to the tendons. This tendon that will connect each muscle to certain bones in the fingers. A tendon is a strong connective tissue that binds to muscles and bones. This tendon finally moves the finger as you ordered.
When the muscle contracts, the muscle pulls the tendon, which then pulls the bone and moves it. So, simply the brain commands the nerves of the palms to move the tendons and finger bones.
What nerves are connected to the hand to be able to move the finger?
There are two main nerves (in the picture below yellow) to move the finger, the median nerve and the ulnar nerve. The median nerve will lead to the thumb, index finger, middle finger and part of the ring finger. While the ulnar nerve is a part of the nerve that carries a message from the brain to move the little finger, and half the ring finger. The following is a picture of the finger and nerves responsible for delivering the message.
For example to move the little finger, the brain will send a message to the ulnar nerve, then the ulnar nerve will contract the muscles in the palm of the hand so that it moves the tendons of the little finger. Until finally the little finger will move.
Each finger has a joint that can be moved too
Every single finger also has the ability to be moved even though it doesn't move widely in any direction. Each finger has 3 bones, except for the thumb which only has 2 bones.
Between the bones there is a joint. It is this joint that makes the fingers move. The joints between the finger bones can only be moved in one way, flexion and extension or bending and straightening. This means that the finger can only move and then straighten again.
If you move your finger, you can only bend it one direction and return it straight again, right? Well, that's what is meant by bending and straightening.
Especially for thumbs, besides doing flexion and extension, the joints can also be moved more freely than other fingers.
Try to feel the presence of muscles when your finger moves
Straighten your hands forward with your palms facing down and your fingers stretching limply. Then, keep your hands in a straight forward position while clenching your fists. Do you feel any muscle movements like being attracted to your lower arm? Well, this is one sign that the finger is moved by a muscle that is outside the finger.
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