Flexing of the forearm by the biceps brachii: The biceps brachii is the agonist, or primer mover, responsible for flexing the forearm. The triceps brachii (not shown) acts as the antagonist.
Which muscle is a powerful agonist of adduction and medial rotation of the arm?
When contracting, the latissimus dorsi muscle produces torque and force to achieve its function (in this case extension, adduction and medial rotation of the glenohumeral joint).
What forearm muscle is a powerful wrist flexor?
The forearm muscle that serves as a powerful wrist flexor is the flexor carpi radialis (option B). Flexor carpi radialis is seen at the anterior…
Which of the following is a prime mover of arm flexion?
Pectoralis major is the muscle which acts as prime mover in shoulder flexion. The biceps brachii assist this movement. Muscles that have their origins in the posterior (back of) shoulder joint extend the arm.
What is powerful muscle is the prime mover of arm extension?
7-10 a and b.) (The deltoid is a common site for intramuscular injections.) Action: prime mover in arm extension, used in powerful downward movement of the arm as in swimming, rowing or hammering.
What muscles flex the arm?
The biceps brachii, brachialis, and brachioradialis flex the forearm. The two-headed biceps brachii crosses the shoulder and elbow joints to flex the forearm, also taking part in supinating the forearm at the radioulnar joints and flexing the arm at the shoulder joint.
Which are muscles that flex and/or Supinate the arm at the elbow?
Superficial muscles of the chest and upper arm: The biceps brachii is located in the anterior compartment of the upper arm and flexes and supinates the forearm at the elbow.
Which of the following muscles is a powerful Supinator of the forearm?
The other supinator muscle we know about already. It’s the biceps. The insertion of the biceps on the radial tuberosity gives it plenty of power to rotate the radius, especially when the elbow is flexed.
What muscles flex the elbow?
Brachialis: upper arm muscle beneath the biceps which flexes the elbow towards the body. Brachioradialis: forearm muscle that flexes, straightens and pulls the arm at the elbow.
What muscles flex fingers?
The flexor digitorum profundus (FDP) is an extrinsic hand muscle that flexes the metacarpophalangeal and distal interphalangeal joints of the index, middle, ring, and little fingers.
What is the agonist in shoulder flexion?
Agonist is deltoid, antagonist is the latissimus dorsi. As the muscles contract across the shoulder joint it brings your shoulder upward into flexion as you push the ball the opposite happens and the antagonist becomes your deltoid and the latissimus dorsi becomes your agonist. Gives you the force to push the ball.
Is a powerful forearm extensor at the elbow joint?
Two muscles – the triceps brachii and anconeus – act as the extensors of the forearm. The rotation of the forearm is accomplished by two muscles that cross the elbow: the pronator teres and the supinator.
Which muscle is a prime mover of arm adduction quizlet?
A prime mover of the arm that acts in adduction would be the deltoid.
Which muscle is the agonist for elbow extension and the antagonist for elbow flexion?
The triceps is the antagonist because it is on the opposite side of the elbow joint and has the potential to oppose the elbow flexion. Now, if we are talking about active elbow extension, the triceps is the agonist because it causes the action, and the biceps is the antagonist.
What muscle rotates the arm medially?
The subscapularis, along with the teres major, another intrinsic muscle that is not part of the rotator cuff, and extrinsic muscles like the pectoralis major and latissimus dorsi, is responsible for medial, or internal, rotation of the arm.