Study Notes Biology Diagrams The muscles of the hand can be divided into extrinsic and intrinsic muscles This is a tutorial covering the intrinsic muscles of the hand using diagrams and 3d models to demonstrate origin, insertion and innervation of the muscles of the hand.
The muscles of the hand are the skeletal muscles responsible for the movement of the hand and fingers. The muscles of the hand can be subdivided into two groups: the extrinsic and intrinsic muscle groups. The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm. The skeletal muscles of the hand are responsible for the movement of the hand and fingers.[1] These muscles subdivide into two groups: the extrinsic and intrinsic muscles.[2][3] The extrinsic muscle group is called so because the muscle belly originates in the forearm.[2][4] The intrinsic muscle groups consist of smaller muscles solely located within the various hand osseofascial compartments The muscles that act on the hand can be divided into two groups: Extrinsic muscles - located in the anterior and posterior compartments of the forearm. They control crude movements and produce a forceful grip. Intrinsic muscles - located within the hand itself. They are responsible for the fine motor functions of the hand. In this article, we shall look at the anatomy of the intrinsic
Hand Muscles: Intrinsic & Extrinsic Muscles with Anatomy, Diagram Biology Diagrams
The hand serves as the origin and/or insertion for a vast number of muscles. The intrinsic muscles of the hand contain the origin and insertions within the carpal and metacarpal bones. The extrinsic muscles of the hand originate outside the hand, commonly the forearm, and insert into hand structures. A rule of thumb is that any muscle tendon that crosses a joint will act on that joint. For The muscles of the thenar and the hypothenar eminence along with the adductor compartment make up the intrinsic muscles of the hand. Their origin and insertion is within the carpal and metacarpal bones and are surrounded by ligaments, and fascia of the hand.
I mentioned before the mnemonic MeatLOAF, which helps you remember that the median nerve innervates the lateral two lumbricals and the muscles of the thenar eminence. The rest of the muscles, intrinsic muscles of the hand are actually innervated by the ulnar nerve. The hypothenar muscles are innervated by the deep branch of the ulnar nerve.
