THE BRACHIAL PLEXUS INTRODUCTION This is a major source of the nerves of the upper limbs. Its origin is from the ventral primary rami of the 5th, 6th, 7th, 8th cervical nerves and a large part of the 1st thoracic nerve (these are the roots). The roots run down uniting to form the trunks. The trunk also divide to form the divisions and finally the divisions unite to form the cords and its from these that the MAJOR branches of the plexus arise- the musculotaneos nerve, axillary nerve, median nerve, radial nerve and ulna nerve. THE ROOTS; The roots are fomed by the contribution of the ventral primary rami of C5 – C8 and T1 coming from the intervertebral foreamen. They form the five roots of the brachial plexus.the roots unite to form the trunks. THE TRUNKS; The roots unite to form the upper, middle and lower trunk. The upper trunk is formed by the coming together of the C5 and C6 roots. The C7 stands alone to form the middle trunk. The C8 and T1 come together to form ...
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