lecture 21 - arm & forearm muscles Flashcards
What are the 2 compartments of the arm?
Anterior, posterior
What are the compartments of the arm seperated by?
Medial and lateral intermucular septa
What are the muscles of the anterior compartment of the arm?
biceps brachii, brachialis, coracobrachialis
What are the muscles of the posterior compartment of the arm?
Triceps brachii
What are the 2 heads of biceps brachii?
Long head, short head
What is the origin of the short head of the biceps?
Coracoid process of scapula
What is the origin of the long head of the biceps?
Supraglenoid tubercle of the scapula
What is the function of biceps brachii?
Flexion, supination of the forearm
What is the origin of coracobrachilais?
Coracoid process
What is the insertion of coracobrachialis?
Shaft of humerus
What is the function of corachobrachialis?
Humerus adduction, flexion
What is the origin of brachialis?
Shaft of humerus
What is the insertion of brachialis?
Ulna tuberosity and coronoid process of proximal ulna
What is the function of brachialis?
Flexion of elbow
What is the primary flexor of the elbow?
Brachialis
What are the 3 main flexors of the elbow?
Biceps brachii, brachialis, brachioradialis
What are the 2 weak flexors of the elbow joint?
Pronator teres, flexor carpi radialis
What is the deepest muscle of the posterior compartment of the arm?
medial head of the triceps
What part of the triceps is deep to the long head?
Medial head
Is the long head of the triceps more medial or lateral on the posterior arm?
Medial
What is the origin of the long head of the triceps brachii?
Infraglenoid tubercle of scapula
What is the origin of the lateral head of the triceps brachii?
Posterior surface of humerus
What is the origin of the medial head of the triceps brachii?
Posterior surface of humerus
What is the insertion of the tendon of triceps brachii?
Olecranon of ulna
What is the function of the triceps brachii muscle?
Extension of the elbow
What is the origin of brachioradialis?
Lateral supraepicondylar ridge of humerus
What is the insertion of brachioradialis?
Distal radius
What are the 2 groups of muscles in the anterior compartment of the forearm?
Superifical, deep