Posted by Daniel on November 01, 2017 at 19:25:51:
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.
F, depress and protract scapula.
: 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.
T, however minor inserts on coracoid and does not insert on IT sulcus
: 5. The long thoracic nerve is a branch of the posterior cord of the brachial plexus and innervates the serratus anterior.
T, long thoracic is a branch of both Posterior and lateral cord roots
: 6. The cords of the brachial plexus are named according to their relationships to the coracoid process.
F, axillary artery
: 7. Severance of the posterior cord that affects all branches eliminates lateral rotation at the glenohumeral joint.
F, supra scapular n is a branch of lateral cord and innervates infraspinatus
: 8. Severance of the posterior cord results in a flexed and adducted resting position of the wrist.
ST (seems true).
: 9. Severance of the lateral cord of the brachial plexus entirely eliminates flexion at the elbow.
F, brachioradialis is innervated by radial n
: 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.
F, triceps n branches proximal to groove. also long head triceps is supposedly innervated by axillary n.
: 12. The anterior and posterior humeral circumflex arteries circle the anatomical 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.
F, triangular interval
: 15. The musculocutaneous nerve passes through the short head of the biceps as it enters the posterior 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.
: 19. Severance of the ulnar at the axilla results in the ulnar paradox.
T, more n more proximal the injury the less damage, more distal is more debilitating
: 20. Severance of the median nerve in the axilla affects flexion at the elbow.
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