Posted by clp on November 01, 2017 at 19:15:43:
In Reply to: Axilla and Brachial Plexus - True/False posted by lae2 on October 31, 2017 at 15:10:26:
Axilla and Brachial Plexus - True/False
1. Two muscles take origin from the coracoid process and one muscle inserts at the coracoid process.
2. Pectoralis minor depresses the scapula and adducts at the glenohumeral joint.
3. At the anterior boundary of the axilla the lateral pectoral nerve is medial to the medial pectoral nerve.
4. The latissimus dorsi inserts on the intertubercular sulcus; medial to pectoralis major and lateral to pectoralis minor.
a. False: pectoralis minor attaches to coracoid process
5. The long thoracic nerve is a branch of the posterior cord of the brachial plexus and innervates the serratus anterior.
a. False: branch from C5,6,7 nerve roots
6. The cords of the brachial plexus are named according to their relationships to the coracoid process.
a. False: in relation to the axillary artery
7. Severance of the posterior cord that affects all branches eliminates lateral rotation at the glenohumeral joint.
a. False: still have suprascapular nerve from superior trunk which innervates infraspinatus
8. Severance of the posterior cord results in a flexed and adducted resting position of the wrist.
9. Severance of the lateral cord of the brachial plexus entirely eliminates flexion at the elbow.
a. False: still have brachioradialis = radial nerve
10. Severance of the lateral and medial cords of the brachial plexus results in an extended and abducted resting position of the wrist.
11. Severance of the radial nerve at the spiral grove results in a flexed wrist and loss of extension at the elbow.
a. False: still have extension of the elbow through triceps
12. The anterior and posterior humeral circumflex arteries circle the anatomical neck of the humerus.
a. False: circle the surgical neck of the humerus
13. Distal to the circumflex scapular artery the subscapular artery continues as the thoracodorsal artery.
14. The profunda brachii artery passes through the triangular space to arrive at the infraspinous fossa.
a. False: the circumflex scapular artery passes through the triangular space
15. The musculocutaneous nerve passes through the short head of the biceps as it enters the posterior arm.
a. False: passes through coracobrachialis to enter the anterior compartment of the arm
16. The C5 root of the brachial plexus elaborates the dorsal scapular nerve and contributes to the phrenic and long thoracic nerves.
17. The superior trunk of the brachial plexus elaborates the suprascapular nerve.
18. Erb's palsy primarily affects the shoulder and Klumke's palsy primarily affects intrinsic muscles of the hand.
a. True: Erb’s is upper bracial plexus while Klumpke’s is lower brachial plexus
19. Severance of the ulnar at the axilla results in the ulnar paradox.
20. Severance of the median nerve in the axilla affects flexion at the elbow.
a. True: however, flexion at the elbow will not be lost completely
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