Muscle Quadratus Forearm

Muscle quadratus forearm: structure and functions

The quadratus antibrachii muscle (m. quadratus antibrachii) is one of the important muscles of the human upper limb. It is located on the back of the forearm, between the radius and ulna bones. In this article we will look at the structure and functions of the quadratus brevis muscle.

The structure of the quadratus forearm muscle includes two segments: upper and lower. The upper segment starts from the fossa of the ulna and is directed towards the shoulder, and the lower segment starts from the fossa of the radius and is directed towards the wrist. Both segments join in the middle third of the forearm, forming a pair of quadratus muscles. Each of these muscles has its own muscle head and tendon, which ensure their connection with the corresponding points of the bones.

The functions of the quadratus brevis muscle are very important for performing various movements of the upper limb. It plays a role in flexion and extension of the forearm at the elbow joint. When the muscle contracts, it pulls the ulna and radius closer together, causing the forearm to flex. When the muscle relaxes, the forearm extends.

In addition, the quadratus brevis muscle is also involved in the rotation of the forearm. If both quadratus muscles contract simultaneously, they cause the forearm to supinate (turn the palm upward). If only one muscle contracts, the forearm pronates (turns the palm down).

The quadratus brevis muscle is closely related to other muscles and structures of the upper limb, such as the muscles of the forearm, shoulder and hand. The complex interaction of these muscles ensures the accuracy and strength of hand movements.

In conclusion, the quadratus brevis muscle is an important component of the muscular system of the upper limb. Its structure and function allow us to perform a wide range of movements necessary to perform everyday tasks. Understanding the anatomy and function of this muscle helps us better control hand movements and maintain hand health and functionality.