Difference between pronator teres and pronator quadratus

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Topics	Pronator teres	Pronator quadrates
Origin	It arises by two heads Superficial head from the medial epicondyle of the humerus and deep head from medial margin of the coronoid process of ulna	From the oblique ridge on the lower one fourth of the anterior surface of the shaft of ulna and medial part of this surface
Insertion	A rough impression on the middle one-third of the lateral surface of the radius	The superficial fibres into the distal one fourth of the anterior border and anterior of the shaft of radias The deep fibres into the triangular area above the ulnar notch of the radius
Nerve supply	Median nerve	Anterior interosseous nerve a branch of median nerve
Action	pronator of the forearm It also weakly  flexed the  elbow	When pronator quadratus contracts, it pulls the lateral side of the radius towards the ulna, thus pronating the hand. Its deep fibers serve to keep the two bones in the forearm bound together. This  muscle can be absent in some humans, however, that does not affect the action of pronation very
Shape of muscle	Circular or round	Square shaped
Important relation	It forms the medial boundary of the cubital fossa	It crosses the front of the distal parts of radius and ulna
Median nerve	The median nerve enters the forearm between the two heads of the muscle, and is separated from the ulnar artery by the ulnar head.	The median nerve situated deep to the pronator quadrates
Direction of muscle	Muscle situated obliquely in the upper half of  forearm	Muscle situated horizontally at the lower part of forearm
Variation	Occasionally, the ulnar head is absent. Also, additional slips from the medial intermuscular septum, from the biceps brachii, and from the brachialis occasionally occur.	Absent in some individual