Anatomical study of pronator teres muscle
innervation and clinical significance in nerve transfer.
It courses down the arm adjacent to the brachialis muscle, crosses the antecubital fossa under the lacertus fibrosus, and then travels between the superficial and deep heads of the pronator teres muscle
. At this point, prior to passing deep to the fibrous arch of the flexor digitorum superficialis, the median nerve bifurcates into the median nerve proper and the AIN (Figure 1).
Similar tenderness was found on the lateral forearm extensors, common extensor tendon, and pronator teres muscle
. Notwithstanding an absence of ligamentous laxity, pain was elicited during palpation of the ulnar collateral ligament and annular ligament.
Start by testing for Tinel's sign over the pronator teres muscle
, although this has been found to be positive in less than 50% of PS cases.
Hence, the aim of this study was to study the innervation of pronator teres muscle
and its variations.
It passed superficial to the pronator teres muscle
and then ran downwards and medially to run lateral to the ulnar nerve.
Compression can occur between the two heads of the pronator teres muscle
, between pronator teres and the flexor digitorum sublimus muscles and from an aponeurotic band of fibrous tissue extending from the biceps tendon to the forearm fascia.
2) The pronator teres muscle
in the forearm of one specimen was only found innervated by the musculocutaneous nerve, even in this forearm there was no communicating branch to median nerve (Fig.
Distal to the elbow, the SUA followed the usual course lateral to the median nerve, then crossed superficial to the median nerve, but was separated from it by the humeral head of the pronator teres muscle
With a digital caliper, we measured the branches of the pronator teres muscle
(PTM), anterior interosseous nerve (AIN), extensor carpi radialis longus muscle (ECRL), extensor carpi radialis brevis muscle (ECRB), and posterior interosseous nerve (PIN).
Palpation revealed tenderness and a tender point in the pronator teres muscle
. Palpation over the medial epicondyle revealed pain and reproduced symptoms described by the patient.