Root
Trunk
divisions
cords
branches
100
What are the roots of the brachial plexus?
C5, C6, C7, C8, T1
100
What are the three types of trunks?
superior, middle, inferior
100
How many divisions are formed when the trunks of the brachial plexus split?
6
100
What are the cords of the brachial plexus named in relation to?
Axillary artery
100
name all the branches
Musculocutaneous, axillary, median, radial, ulnar nerve
200
name one nerve that branches from the root
dorsal scapular nerve, long thoracic nerve
200
What root(s) contribute to the middle trunk?
C7
200
What is the main difference in function between the anterior and posterior divisions of the brachial plexus?
Anterior divisions: supply flexor muscles of the upper limb.
Posterior divisions: supply extensor muscles of the upper limb.
200
Which cords do the nerves that innervate the pectoralis major come from?
Medial and lateral cords
200
which branch does superior lateral brachial cutaneous branch originate from?
Axillary nerve
300
Where are the roots located?
Between the middle and anterior scalene muscles
300
What root(s) contribute to the superior trunk and what root(s) contribute to the inferior trunk?
superior trunk:C5 and C6
inferior trunk:C8 and T1
300
If the anterior division of the inferior trunk is damaged, which cord will be affected and what type of muscles will lose function?
The medial cord will be affected (since it comes from the anterior division of the lower trunk).
This mainly impacts flexor muscles of the forearm and hand (via the ulnar nerve and part of the median nerve).
300
Which nerve from the posterior cord innervates the latissimus dorsi?
Thoracodorsal nerve
300
damage to which part of the median nerve would result in complete loss of flexion at the phalanges?
Distal humeral region, medial epicondyle