What are the main muscles and tendons of the hand?
The hand is a part of the human body made up of muscles and tendons that give it the flexibility and mobility needed to perform precise gestures. The main muscles and tendons of the hand are:
Muscles:
– The interossei: these are muscles that extend between the bones of the fingers and the metacarpals. They help to bend and release the fingers and to maintain their position.
– The lumbricales: these are muscles that extend between the tendons of the flexors and extensors of the fingers. They help to bend and release the fingers and to maintain their position.
– The adductors: these are muscles that extend between the bones of the fingers and the metacarpals. They help to adduct the fingers, that is, to spread them apart when they are tense.
– The flexors: these are muscles that extend between the fingers and the phalanges. They help to bend the fingers and give them some strength.
– The extensors: these are muscles that extend between the fingers and the phalanges. They help extend the fingers and give them some strength.
Tendons:
– The extensor tendons: these are tendons that extend from the extensor muscles of the fingers to the phalanges. They help extend the fingers and give them some strength.
– The flexor tendons: these are tendons that extend from the flexor muscles of the fingers to the phalanges. They help to bend the fingers and give them some strength.
– The adductor tendons: these are tendons that extend from the adductor muscles of the fingers to the phalanges. They help to adduct the fingers, that is, to spread them apart when they are tense.
How does the nervous system of the hand work?
The hand nervous system is a complex network of nerves that connect the brain to the hand and its fingers. It allows the hand and its fingers to react to sensory and motor stimuli. The nervous system of the hand consists of two types of nerves: motor and sensory. Motor nerves provide information from the brain to operate the muscles of the hand and its fingers. This information is sent by electrical impulses from muscles and joints as well as information from nerve endings perceived by sensory receptors located in the hands and fingers. Sent to the muscles, these electrical impulses cause a muscle contraction which, in turn, allows the hand and fingers to move. Sensory nerves deliver sensitive information from sensory receptors in the hand and fingers. This information is sent to the brain so that the nervous system can respond to sensory stimuli. Sensory nerves also send information regarding the position and movement of the hand and fingers to the brain, allowing the hand and fingers to perform precise and coordinated movements. The hand nervous system is essential for the normal functioning of the hand and its fingers.
What are the different joints of the hand?
The joints of the hand allow movements of flexion and extension, rotation and pronation and supination. The human hand has ten main joints:
1. The carpal joints: the wrist, made up of the scaphoid, lunate and triquetrum bones, and their articulation with the radius and ulna.
2. The metacarpophalangeal joints: the joint between each metacarpal and the proximal and distal phalanges.
3. The proximal interphalangeal joints: the joint between the proximal and middle phalanges.
4. The distal interphalangeal joints: the joint between the middle and distal phalanges.
5. The intermedial joints: the joint between the metacarpals and the proximal phalanges.
6. The interphesial joints: the joint between the proximal and distal phalanges.
7. The interosseous joints: the joint between the bones of the hand.
8. The interpulmonary joints: the joint between the thumb and the other fingers.
9. The intertendinous joints: the joint between the tendons and the bones.
10. The interosseous joints of the wrist joint: the joint between the bones of the wrist and the bones of the arm.
What are the possible hand movements?
The movements of the hand are varied. The main movements include flexion, extension, abduction, adduction, internal and external rotation and pronation and supination. Flexion corresponds to the inclination of the fingers towards the front of the hand and the flexion of the metacarpophalangeal joints. Extension is the opposite movement to flexion, where the fingers are stretched backwards. Abduction is when the fingers are spread apart, while adduction is when they are brought together. Internal and external rotation occur when the wrist rotates inward and outward, respectively. Pronation and supination are the rotational movements of the hand on its longitudinal axis.
Osteology – Anatomy of the bones of the hand
Hello everyone ! Today we present to you a new Scandium course on the bones and joints of the hand.
