Match the muscle with its main action: ​     


______Biceps brachii muscle     
______Pronator teres muscle     
______Extensor digitorum muscle     
______Brachialis muscle     
______Triceps brachii muscle     
______Flexor carpi radialis muscle​a.


a. Extends fingers and hand
b. Supinates forearm
c. Flexes hand
d. Extends forearm
e. Pronates forearm
f. Flexes forearm

Verified step by step guidance

1. Identify the main action of the Biceps brachii muscle, which is primarily responsible for flexing the forearm and also assists in supination of the forearm.
2. Determine the main action of the Pronator teres muscle, which is to pronate the forearm.
3. Recognize the main action of the Extensor digitorum muscle, which is to extend the fingers and hand.
4. Understand the main action of the Brachialis muscle, which is to flex the forearm.
5. Identify the main action of the Triceps brachii muscle, which is to extend the forearm, and the Flexor carpi radialis muscle, which is to flex the hand.

Key Concepts

Muscle Actions

Muscle actions refer to the specific movements produced by muscles when they contract. Each muscle has a primary action based on its anatomical position and attachment points. Understanding these actions is crucial for identifying which muscle corresponds to a given movement, such as flexion, extension, or pronation.

Anatomy of the Upper Limb Muscles

The upper limb contains various muscles that perform distinct functions. For example, the biceps brachii primarily flexes the forearm, while the triceps brachii extends it. Familiarity with the anatomy and function of these muscles helps in accurately matching them to their respective actions.

Nerve Innervation

Nerve innervation is the process by which nerves supply muscles with signals to contract. Each muscle is innervated by specific nerves that control its action. Understanding which nerves correspond to which muscles can provide insights into their functions and help in diagnosing potential injuries or conditions affecting muscle movement.