Muscle Actions
What is the action of the supinator
What is the supination of the forearm
What is the insertion of the triceps brachii
What is the olecranon process of the ulna
Name one muscle that is innervated by the radial nerve
Supinator, triceps brachii, brachialis, and anconeus
The number of degrees of freedom of the proximal radioulnar joint
What is 1
A baseball pitcher reports medial elbow pain after repetitive throwing. Which ligament is most likely injured from chronic valgus stress
What is the Medial (ulnar) Collateral Ligament
What are the actions of the pronator teres
What is pronation of the forearm and assist in flexing the elbow
What is the origin of the brachialis
What is the distal half of anterior surface of humerus
What muscles do the musculocutaneous nerve innervate
Biceps brachii, coracobrachialis, and brachialis
This shallow depression on the posterior aspect of the distal humerus accommodates the olecranon process of the ulna during full elbow extension
What is the olecranon fossa
A young child is lifted by the arm and an injury at the elbow occurs. The radial head has slipped out of this ligament
What is the annular ligament
What are the actions of the biceps brachii
What is flexion of the elbow, supination of the forearm, and flexion of the shoulder
What is the insertion of the pronator quadratus
What is the lateral, anterior surface of distal radius
What is the major artery found in the anterior compartment and is a continuation of the axillary artery
What is the brachial artery
The depression on the proximal radius that articulates with the capitulum
What is the fovea
After a posterior elbow dislocation, you notice extensive swelling and joint effusion. This structure was likely stretched or torn
What is the Joint capsule of the elbow
What are the actions of the brachioradialis
What is flexion of the elbow and assist to pronate and supinate the forearm when these movements are resisted
What is the insertion of the anconeus
What is the olecranon process and posterior proximal surface of the ulna
What vein passes vertically in the distal half of the arm and penetrates deep fascia to assume a position medial to the brachial artery
What is the basilic vein
This roughened area just distal to the head of the radius serves as the insertion for the biceps brachii tendon
What is the radial tuberosity
This bundle is the primary restraint of valgus force of the medial collateral ligament
What is the anterior bundle
What are the actions of the triceps brachii
What is:
All heads: extend the elbow
Long head: extend the shoulder and adduct the shoulder
What is the origin of the supinator
What is lateral epicondyle of humerus, radial collateral ligament, annular ligament, and supinator crest of the ulna
What artery passes into and supplies the posterior compartment of the arm
What is the profunda brachii artery
An evulsion fracture of this site would result in wrist extensor weakness
What is the lateral epicondyle of the femur
Following radial head dislocation, limited supination persists. Injury to this small ligament between the radial notch of the ulna and the neck of the radius may be restricting motion
What is the quadrate ligament