Flexor digitorum profunds
Flexor digitorum profundus and superficialis
Flipping someone the bird primarily involves the contraction of two muscles: the flexor digitorum profundus and the flexor digitorum superficialis, which control the movement of the middle finger.
There would be 2 muscles involved in pulling the trigger: 1 - Flexor digitorum superficialis - flexes the proximal interphalangeal joint 2 - Flexor digitorum profundus - flexes the distal interphalangeal joint
The only muscle capable of flexing the distal interphalangeal joints is the flexor digitorum profundus. This muscle originates from the ulna and interosseous membrane in the forearm and inserts on the distal phalanges of the fingers. It is responsible for flexing the distal interphalangeal joints while the flexor digitorum superficialis flexes the proximal interphalangeal joints.
flexor digitorum superficialis
extensor digitorum, extensor indicis, extensor digiti minimi, flexor digitorum superficialis, and the flexor digitorum profundus. There are also extrinsic muscles that work only in the thumb; these include the flexor pollicis longus, extensor pollicis longus, extensor pollicis brevis, and adbuctor pollicis longus
There are several muscles involved in flexing the hand. - Palmaris longus (flexes hand) - Flexor carpi radialis (flexes and abducts hand) - Flexor carpi ulnaris (flexes and adducts hand) - Flexor digitorum superficialis (flexes proximal and middle phalanges, flexes hand) - Flexor digitorum profundus (flexes phalanges and hand) - Flexor pollicis longus (flexes thumb and hand) - Flexor pollicis brevis (flexes thumb) There are also a few more I did not include that flex specific digits of the hand
Lumbrical Muscles - flexes the fingers towards the palm Flexor Digitorum Superficialis - flexes the fingers towards the palm Flexor Digitorum Profundus - flexes the tips of the fingers towards the palm Opponens Pollicis - opposes the thumb
Pronator quadrants flexor digitorum profundus flexor digitorum superficial is flexor carpi radials
The flexor digitorum superficialis muscle inserts on the middle phalanges of the four fingers (index, middle, ring, and little) of the hand.
The muscles responsible for closing the fist are the flexor muscles located in the forearm. They include the flexor digitorum superficialis, flexor digitorum profundus, and flexor pollicis longus muscles. When these muscles contract, they pull on the tendons attached to the fingers and thumb, allowing the hand to make a fist.
The flexor digitorum profundus