Bài tóm tắt các nhóm cơ trên cánh tay và khuỷa tay với hình minh họa đầy đủ và sống động. Các chuyển động của cánh tay và các nhóm cơ thực thi các chuyển động này. Hiểu sau hơn về các nhóm cơ giúp chúng ta phát triển nhóm cơ bổ trợ và hạn chế chấn thương khi chơi thể thao
Muscles of the Arm and Elbow Actions of the Arm at the Elbow • Flexion: bending at the elbow • Extension: straightening at the elbow • Pronation: moving the arm in a palms down position • Supination: moving the arm in a palms up position Muscles that act to Flex at the elbow • Most of these muscles are located on the anterior side of the upper arm • Biceps brachii (prime mover) • Brachialis • Brachioradialis Biceps Brachii • Origin: – Long head: supraglenoid tubercle of scapula – Short head: coracoid process of the scapula • Insertion: – Radial tuberosity (radius) • Actions: – Flexion at the elbow – Supination at the elbow – Assists in flexion at the shoulder Brachialis • Origin: – Humerus • Insertion: – Coronoid process of the ulna • Action: – Flexion at the elbow Brachioradialis • Origin: – Humerus • Insertion: – Styloid process of the radius • Actions: – Flexion at the elbow, some pronation and supination at the elbow Muscles that act to Extend at the elbow • These muscles are located on the posterior side of the upper arm • Triceps brachii (prime mover) • Anconeus: – Major function is to stabilize elbow joint and allow for maximal ROM during extension Triceps Brachii • Origin: – Long head: infraglenoid tubercle of the scapula – Medial head: humerus – Lateral head: humerus • Insertion: – Olecranon process of the ulna • Actions: – Extension at the elbow – Long head: extension and adduction of the shoulder Anconeus • Origin: – Lateral condyle of the humerus • Insertion: – Olecranon process of the ulna • Action: – Extension of the elbow Muscles that act to Pronate the arm • Pronator teres • Pronator quadratus • Brachioradialis Pronator Teres • Origin: – Medial supracondylar ridge of humerus, ulna • Insertion: – Radius • Actions: – Pronation, assists with flexion at the elbow Pronator Quadratus • Origin: – Ulna • Insertion: – Radius • Action: – Pronation at the wrist Muscles that act to supinate at the elbow • Supinator • Biceps brachii • Brachioradialis Supinator • Origin: – Lateral epicondyle of the humerus, ulna • Insertion: – Radius • Action: – Supination [...]... ulna • Actions: – Extension at the elbow – Long head: extension and adduction of the shoulder Anconeus • Origin: – Lateral condyle of the humerus • Insertion: – Olecranon process of the ulna • Action: – Extension of the elbow Muscles that act to Pronate the arm • Pronator teres • Pronator quadratus • Brachioradialis Pronator Teres • Origin: – Medial supracondylar ridge of humerus, ulna • Insertion:... Muscles that act to Extend at the elbow • These muscles are located on the posterior side of the upper arm • Triceps brachii (prime mover) • Anconeus: – Major function is to stabilize elbow joint and allow for maximal ROM during extension Triceps Brachii • Origin: – Long head: infraglenoid tubercle of the scapula – Medial head: humerus – Lateral head: humerus • Insertion: – Olecranon process of the. .. humerus, ulna • Insertion: – Radius • Actions: – Pronation, assists with flexion at the elbow Pronator Quadratus • Origin: – Ulna • Insertion: – Radius • Action: – Pronation at the wrist Muscles that act to supinate at the elbow • Supinator • Biceps brachii • Brachioradialis Supinator • Origin: – Lateral epicondyle of the humerus, ulna • Insertion: – Radius • Action: – Supination