Arm Flashcards
What are the flexors of the arm?
biceps brachii, brachialis, and coracobrachialis
What are the four muscles of the arm?
biceps brachii, brachialis, coracobrachialis, and triceps brachii
As elbow flexion approaches 90 degrees, the biceps with the forearm in supination produces _____, but with the forearm in pronation produces ______
flexion; supination
What is the only pure elbow flexor muscle?
brachialis
The musculotaneous nerve pierces what muscle?
coracobrachialis
What muscle is the chief extensor of the elbow?
triceps brachii
What provides the main arterial supply to the arm?
brachial artery
Where does the brachial artery begin and end?
begins at inferior border of the teres major and ends in the cubital fossa opposite the neck of the radius under the bicipital aponeurosis
The brachial artery divides into what?
radial and ulnar arteries
What are the main branches from the medial aspect of the brachial artery?
profunda brachii artery and the superior and inferior ulnar collateral arteries
What are the main superficial veins of the arm?
cephalic and basilic vein
What are the main nerves of the arm?
radial, ulnar, median, and musculotaneous
What forms the median nerve?
union of medial and lateral roots from the medial and lateral cords of the brachial plexus, respectively
TRUE or FALSE?
The median and ulnar nerves supply no branches to the arm
true
From where does the ulnar nerve arise?
medial cord of the brachial plexus
From where does the musculotaneous nerve arise?
lateral cord of the brachial plexus
What does the musculocutaneous nerve innervate?
biceps brachii, brachialis, and coracobrachialis
What does the radial nerve innervate?
muscles in the posterior compartment of the arm and forearm and the overlying skin
What is the cubital fossa?
shallow triangular depression on anterior elbow
What is the superior boundary of the cubital fossa?
an imaginary line connecting the medial and lateral epicondyles
What is the medial border of the cubital fossa?
the pronator teres
What is the lateral border of the cubital fossa?
the brachioradialis
What is the floor of the cubital fossa?
brachialis and supinator teres
What is the roof of the cubital fossa?
continuity of brachial and antebrachial fascia, bicipital aponeurosis, subcutaneous tissue, and skin
