Upper Limb IV: Arm & Elbow

What innervates the anterior compartment of the arm muscles?

Musculocutaneous n.

Where do the coracobrachialis m. and short head of the biceps brachii originate?

Coracoid process

What arm muscle attaches at the medial humeral shaft?

Coracobrachialis

What are the main action(s) of the coracobrachialis?

Flexion of the arm, adduction of the arm

Where does the long head of the biceps brachii originate?

Supraglenoid tubercle

Where does the biceps brachii attach?

Radial tuberosity

What are the main action(s) of the biceps brachii?

Flexion of the supinated forearm, supination of the flexed forearm

Where does the brachialis originate?

Anterior surface of the humeral shaft

Where does the brachialis attach?

Coronoid process of the ulna

What are the main action(s) of the brachialis?

Flexion of the forearm

What innervates the posterior compartment of the arm muscles?

Radial n.

Where does the long head of the triceps brachii originate?

Infraglenoid tubercle

Where does the lateral head of the triceps brachii originate?

Posterior surface of humerus above radial groove

Where does the medial head of the triceps brachii originate?

Posterior surface of the humerus below radial groove

Where does the triceps brachii attach?

Olecranon

What artery divides into the radial and ulnar arteries opposite the radial neck?

Brachial artery

What accompanies the radial nerve?

Deep brachial artery

What drains the lateral side of the upper limb (superficial)?

Cephalic vein

What joins the axillary vein in the deltopectoral triangle?

Cephalic vein

What drains the medial side of the upper limb (superficial)?

Basilic vein

What drains the muscles in the upper limb (deep)?

Brachial vein

Which structure is formed from the articulation of these 3 joints: humeroulnar, proximal radioulnar, humeroradial?

Elbow

What joint is the most important for flexion/extension of the arm?

Humeroulnar

What joint is the most important for pronation/supination of the arm?

Proximal radioulnar, humeroradial

The ulnar collateral and radial collateral ligaments restrict movement across the __.

Humeroulnar joint

True or False: Collateral ligaments allow for side-to-side deviation and rotation of a hinge joint.

False

What converts the radial notch into a pivot joint in which the radial head rotates during pronation/supination?

Annular ligament

What is the clinical significance of partial dislocation of the radial head?

Nursemaid’s elbow