The long flexor muscle of the thumb is placed deep in the antero-lateral part of the forearm. It originates from the middle part of the anterior aspect of the radius, from the lateral part of the interosseous membrane, from the epitroclea of the humerus and from the coronoid process of the ulna. Set up inside the carpal tunnel lined with its own tendon sheath.
Its tendon is inserted on the base of the distal phalanx of the thumb.
It flexes the distal phalanx of the first finger (thumb), contributes to the flexion of the metacaralangea and of the trapezium - metacarpal and can intervene in the flexion of the wrist.
It is innervated by the palate interosseous nerve and the median nerve (C7-C8). It is sprayed from the anterior interosseous artery.
ORIGIN Middle part of the front face of the radius; lateral part of the interosseous membrane; epitrochlea of the humerus; coronoid process of the ulna. |
| INSERTION Base of the distal phalanx of the thumb |
ACTION It flexes the distal phalanx of the first finger (thumb), contributes to the flexion of the metacaralangea and of the trapezium - metacarpal and can intervene in the flexion of the wrist. |
| INNERVATION palmar interosseous nerve; median nerve (C7-C8) |
| Upper limb | Lower limb | Trunk | Abdomen | Articles |
