Brachial Plexus Flashcards
What nerve roots form the superior trunk of the brachial plexus?
C5,C6
What nerve roots form the middle trunk of the brachial plexus?
continuation of C7
What nerve roots from the inferior trunk of the brachial plexus?
C8 and T1
What divisions make up the lateral cord of the brachial plexus?
The anterior division of the superior trunk and the anterior division of the middle trunk
What divisions make up the posterior cord of the brachial plexus?
The posterior divisions of the superior, middle and inferior trunks
What divisions form the medial cord of the brachial plexus?
The anterior division of the inferior trunk
What divisions form the posterior cord of the brachial plexus?
The posterior divisions of the superior, middle and inferior trunks
What divisions form the medial cord of the brachial plexus?
The anterior division of the inferior trunk
Which cord of the brachial plexus does the axillary nerve arise from?
Posterior cord
Which cord of the brachial plexus does the musculocutaneous nerve arise from?
The lateral cord
Which cord of the brachial plexus Does the median nerve arise from?
The lateral cord and the medial cord
Which cord of the brachial plexus does the ulnar nerve arise from?
Medial cord
Which cord of the brachial plexus does the radial nerve arise from?
Posterior cord
What are the nerve roots of the musculocutaneous nerve?
C5, C6, C7
What are the nerve roots of the axillary nerve?
C5,C6
What are the nerve roots of the median nerve
C5, C6, C7, C8, T1
What are the nerve roots of the radial nerve?
C5,C6,C7,C8
What are the nerve roots of the ulnar nerve?
C8, T1
What is the motor distribution of the musculocutaneous nerve?
Biceps brachii, coracobrachialis, brachialis
What is the sensory distribution of the musculocutaneous nerve?
Lateral half of anterior forearm
Small lateral portion of the posterior forearm
What is the motor distribution of the axillary nerve?
Teres minor, posterior and anterior deltoids
What is the sensory distribution of the axillary nerve?
Inferior aspect of the deltoids
What is the motor distribution of the median nerve?
Most forearm flexor muscles
Thenar muscles
Lateral 2 lumbrical muscles (correspond to the index and middle fingers)
What is the sensory distribution of the median nerve?
Lateral part of palm
Lateral 3 1/2 fingers on palmar surface of hand
What is the motor distribution of the radial nerve?
Triceps brachii
muscles of the posterior forearm (primarily wrist and hand extensors)
What is the sensory distribution of the radial nerve?
Posterior arm and forearm
Posterolateral aspect of the hand
What is the motor distribution of the ulnar nerve?
Most muscles within the hand (except the thenar muscles and the lateral 2 lumbricals)
Flexor carpi ulnaris
Medial 1/2 of Flexor digitorum profundus
What is the sensory distribution of the ulnar nerve?
Anterior and posterior surfaces of the medial 1 1/2 fingers and their assossciated palm areas
