Muscles - appendicular Flashcards
Anterior Thorax - What does the subclavius muscle do?
- Stabilizes and depresses the pectoral girdle.
- Originates from the first rib and inserts into the clavicle.
Anterior Thorax - What is the function of the pectoralis minor?
- Draws the scapula forward and downward.
- Attaches from the ribs to the coracoid process of the scapula.
Anterior Thorax - What does the serratus anterior muscle do?
- Holds the scapula against the chest wall.
- Spans from the ribs to the anterior vertebral border of the scapula.
Posterior Thorax - What is the function of the trapezius muscle?
- Stabilizes, raises, retracts, and rotates the scapula.
- Extends from the occipital bone and vertebrae to the clavicle and scapula.
Posterior Thorax - What does the levator scapulae muscle do?
- Elevates and adducts the scapula.
- Runs from cervical vertebrae C1-C4 to the scapula.
Posterior Thorax - What is the function of the rhomboid muscles?
- Assists in squaring the shoulders and rotating the scapula.
- Located from the vertebrae to the scapula, deep to the trapezius.
Shoulder Joint - What does the pectoralis major do?
- Flexes, adducts, and internal roatation of the arm.
- Large chest muscle, crucial for actions like climbing and pushing.
Rotator Cuff Muscles - What does the supraspinatus muscle do?
- Assists with arm abduction.
- Part of the rotator cuff, stabilizes the shoulder joint.
Shoulder Joint - What is the function of the latissimus dorsi?
- Prime mover of arm extension, adduction, and internal rotation.
- Active in activities like rowing and swimming.
Shoulder Joint - What is the role of the deltoid muscle?
- Prime mover of arm abduction.
- Can also facilitate flexion, extension, and rotation of the arm.
Rotator Cuff Muscles - What is the function of the infraspinatus muscle?
- Aids in lateral rotation and adduction of the arm.
- Part of the rotator cuff.
Rotator Cuff Muscles - What does the teres minor do?
- Works with the infraspinatus for lateral rotation and adduction of the arm.
- Part of the rotator cuff.
Rotator Cuff Muscles - What is the role of the subscapularis muscle?
- Contributes to medial rotation of the arm.
- Part of the rotator cuff.
Teres Major & Coracobrachialis
- What do the teres major and coracobrachialis muscles do?
- Act as synergists with the rotator cuff to stabilize and move the arm.
- Aid in internal rotation and adduction of the humerus.
Crossing the Elbow Joint - What does the brachialis muscle do?
- A major forearm flexor.
- Lifts the ulna as the biceps brachii lifts the radius.
Crossing the Elbow Joint - What is the function of the biceps brachii?
- Flexes the elbow and supinates the forearm.
- Originates from the scapula and inserts onto the radius.
Crossing the Elbow Joint - What is the role of the brachioradialis?
- Acts as a synergist in forearm flexion.
- Runs from the distal humerus to the distal radius.
Crossing the Elbow Joint - What is the function of the triceps brachii?
- Powerful extensor of the forearm, straightening the arm at the elbow.
- Contributes to shoulder joint stabilization.
Forearm - What are the two functional groups of forearm muscles?
- Muscles enabling wrist movement.
- Muscles controlling finger and thumb movements.
Forearm - What do the anterior forearm muscles do?
- Primarily flex the wrist and fingers.
- Attach to bones via the flexor retinaculum.
Forearm - What do the posterior forearm muscles do?
- Primarily extend the wrist and fingers.
- Attach to bones via the extensor retinaculum.
Forearm - What does the flexor carpi ulnaris muscle do?
- Flexes the wrist and adducts the hand.
- Stabilizes the wrist during finger extension.
- Originates from the humerus and ulna, extending to the metacarpals.
Forearm - What is the function of the flexor carpi radialis?
- Strong wrist flexor.
- Aids in hand abduction.
- Runs diagonally from the humerus to the metacarpals.
Forearm - What does the palmaris longus muscle do?
- Weak wrist flexor.
- Slightly assists in elbow flexion.
- Extends from the humerus to the palmar aponeurosis.