Brachial Plexus Flashcards
What anterior rami form the brachial plexus?
The anterior rami of spinal nerves C5-C8 and T1
What muscle of the upper extremity is not innervated by the brachial plexus?
Trapezius
What nerve comes directly off of the C5 spinal nerve?
Dorsal scapular nerve
What are the 3 cords of the brachial plexus?
-Medial
-Lateral
-Posterior
What peripheral nerves come off of the lateral cord?
-Lateral pectoral nerve
-Musculocutaneous nerve
What peripheral nerves come off of the posterior cord?
-Upper subscapular nerve
-Thoracodorsal nerve
-Lower subscapular nerve
-Axillary nerve
-Radial nerve
What peripheral nerves come off of the medial cord?
-Medial pectoral nerve
-Ulnar nerve
-Median nerve
What nerve branches directly from all of the anterior rami in the brachial plexus (C5-T1)
Long thoracic nerve
What muscle would not work if the long thoracic nerve was damaged?
Serratus anterior
What different trunks are there in the brachial plexus? What nerve roots are they from?
-Upper (C5 and C6)
-Middle (C7)
-Lower (C8 and T1)
What divisions does each trunk divide into?
Anterior and posterior
What divisions form the lateral cord?
-Anterior division of the upper trunk
-Anterior division of the middle trunk
What divisions form the posterior cord?
-Posterior division of the upper trunk
-Posterior division of the middle trunk
-Posterior division of lower trunk
What divisions form the medial cord?
Anterior division of the lower trunk
What are the nerve roots of the musculocutaneous nerve?
C5-C7
