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So, the biceps is the main muscle of supination of the forearm but it passes in front of the
elbow and also on front of the shoulder, therefore it flexes both joints. And the coracobrachialis
which helps it in flexing the shoulder and it only passes in front of the shoulder. And
the brachialis which passes only in front of the elbow. Between the biceps and brachialis there is the musculocutaneous
nerve which pierces the coracobrachialis and passes between the biceps and brachialis and
then continous as the lateral cutaneous of the forearm. If we go lateral and posterior
to the brachialis, there will be the radial nerve and it supplies the radial part of the
brachialis
and that's why we say that the brachialis has a double nerve supply. Now when we go to the back of the scapular region , we'll take the
spine of the scapula as a land mark. This is the lateral border
of the scapula and this is its medial border. The trapezius is attached to the upper border of the spine of the scapula
and the deltoid is attached to
the lower margin of that spine. This is the infraspinus fossa with the infraspinatus muscle. above the spine there will be supraspinatus
muscle. There are two attached muscles to the lateral border of the spine of the scapula
which are the teres major and above it the teres minor. Again and as the spins of the
scapula is our land mark: to the medial border of the back of the scapula, there are three muscles. Opposite to the spine
there will be
the rhomboids minor and below it the rhomboids major and above it the levator scapula.