Anterior Brachium
These muscles make up the anterior compartment of the brachium.
What are the biceps brachii (long and short head), coracobrachialis, and brachialis muscles?
The muscle which makes up the whole of the anterior compartment of the brachium is responsible for this primary action.
What is extension of the forearm at the elbow?
These are the muscles that make up the superficial anterior antebrachial compartment.
What are the flexor carpi ulnaris, palmaris longus, flexor carpi radialis, and pronator teres?
This nerve, which is an extension of the deep radial nerve, is responsible for innervating all muscles of the deep layer of the posterior antebrachial compartment.
What is the posterior interosseus nerve?
These structures form the border of the cubital fossa.
What are the brachioradialis, pronator teres, and imaginary line between the medial and lateral epicondyles?
This nerve is responsible for the innervation of all three anterior compartment muscles.
What is the musculocutaneous nerve?
This structure allows for the separation of posterior compartment from anterior compartment.
What is the intermuscular septa?
Aside from the flexor carpi ulnaris (because it just haaaaad to be special), this nerve is responsible for innervating all muscles in the anterior antebrachial compartment.
What is the median n.?
This muscle--which is indeed in the posterior compartment--is responsible for flexing the arm, but only while midpronation.
What is the brachioradialis?
This vein is responsible for the connection between the basilic and cephalic veins.
What is the median cubital vein?
The coracobrachialis m. has a unique feature, being the only muscle in the anterior brachial compartment with this action.
What is flexion of the arm (at the glenohumeral joint)?
The long, medial, and lateral head of the triceps brachii m. originate at these structures, respectively.
What are the infraglenoid tubercle of the scapula, posterior humeral surface (inferior to radial groove), and posterior humeral surface (superior to radial groove)?
These two muscles, on being in the superficial layer and the other in the deep layer, are the muscles responsible for pronation.
What are the pronator teres and pronator quadratus?
Sensory loss over the olecranon indicates injury of this nerve.
These structures, from lateral to medial, run directly through the cubital fossa.
What are the biceps tendon, the brachial artery, and the median nerve?
(2 answers). The long and short head of the biceps brachii converge to insert on this boney feature. This tendon then fans out medially to form this feature, which blends with the deep fascia of the anterior forearm compartment.
What are the radial tuberosity and the bicipital aponeurosis?
The insertion of the triceps brachii m. is on this part of the ulna.
What is the olecranon?
The only muscle in the intermediate layer has a humero-ulnar head and a radial head, which originate here and here, respectively.
What are the medial epicondyle of the humerus and oblique line of the radius?
Loss of function of the brachioradialis and the extensor carpi radialis longus muscles would be indicative of neuropathy of this nerve.
What is the radial nerve?
This structure, which comes of the biceps brachii, separates the median cubital vein from the brachial artery and median nerve.
What is the bicipital aponeurosis?
A 28y/o male presents with pain in the anterior brachium and a decreased elbow reflex after going to the gym. MRI reveals a complete tear of the brachialis m. at its insertion. This/these muscle/s will compensate for the actions of the newly injured brachialis.
What are the biceps brachii m. (long head and short head)?
A 43y/o female presents with a broken humerus after attempting to prove to her friends that she is "not past her prime" and is "still able to slam five shots of tequila and do a back handspring!" Aside from her pride, these two structures are most at risk from this injury.
What are the radial n. and the profunda brachii a.?
A patient presents to the office unable to flex digits 2-4. Upon examination, it is revealed that the muscle responsible has undergone avascular necrosis. These structures will also likely be affected if these issue continues.
What are the flexor pollicis longus m. and pronator quadratus m.?
A patient presents to the emergency room with a broken ulna after trying to do a triple backflip off a trampoline. The patient succeeded, but then tripped over his shoelace when getting off and landing on a rock. Due to the injury, the anterior interosseous artery was severed. This muscle layer would be at risk for potential avascular necrosis due to this injury.
What is the deep muscle layer?
The brachial artery directly bifurcates into these arteries just past the cubital fossa.
What are the radial and ulnar arteries?