Re: Axilla and Brachial Plexus: True/False - Part 2

Comments:
: : True/False : : 1. Pectoralis major inserts, in part, at the lateral lip of the intertubercular sulcus and, thus, contributes to on osseofibrous tunnel for the tendon of the long head of the biceps. : : True : TRUE was the intended answer. : : 2. By definition, the medial lip of the intertubercular sulcus is within the axilla. : : True – pectoralis major is part of anterior border, given it’ : TRUE was the intended answer. : : 3. The axillary sheath houses the axillary artery and the cords of the brachial plexus. : : True : TRUE was the intended answer. : : 4. Roots, trunks, divisions, cords, and branches define the parts of the axillary artery. : : False – brachial plexus : FALSE was the intended answer. : : 5. The ventral root of C7 is both root and a trunk of the brachial plexus. : : True – C7 root and middle trunk : TRUE was the intended answer. : : 6. The brachial plexus receives contributions from the dorsal rami. : : False – ventral rami : FALSE was the intended answer. : : 7. The trunks of the brachial plexus extend into the axilla. : : False – roots, trunks and divisions are in the neck. Only the cords are in the axilla : FALSE was the intended answer. : : 8. The middle subscapular nerve is also know as the thoracodorsal nerve and as the nerve to latissimus dorsi. : : False – This one is a little confusing. The thoracodorsal nerve does innervate latissumus dorsi and it is branch off the posterior cord that falls between the superior and inferior subscapular nerves. However, I do not find a reference to the use of the term middle subscapular in lieu of thoracodorsal anywhere. : TRUE was the intended answer. Middle subscapular, thoracodorsal, and nerve to latissimus dorsi are references to the same nerve. : : 9. The long thoracic nerve innervates serratus posterior inferior and serratus posterior superior and, thus, mediates stability of the scapula. : : False – these muscles are innervated by intercostals nerves : FALSE was the intended answer. The serratus posterior muscles do not stabilize the scapula nor are they innervated by the long thoracic nerve. : : 10. The lower subscapular nerve innervates two muscles and each of these muscles laterally rotate the arm. : : False – innervatealse – innervates subscapularis and teres major, which are medial rotators, : FALSE was the intended answer. : : 11. The upper subscapular nerve innervates one muscle and this muscle is a medial rotator of the arm. : : True – subscapularis, medial rotator : TRUE was the intended answer. : : 12. The medial brachial cutaneous and medial antebrachial cutaneous nerves provide cutaneous sensation to the medial aspects of the arm and forearm respectively. : : True : TRUE was the intended answer. : : 13. The median nerve is formed by the medial and posterior roots of the median nerve. : : False – lateral root of median nerve and medial root of median nerve : FALSE was the intended answer. : : 14. A lesion of the axillary nerve within the axilla will cause uncompensated loss of abduction and medial rotation of the arm. : : False – you will still have medial rotation from subscapularis and teres major, 0 -15 degrees of abduction from supraspinatus : FALSE was the intended answer. What if the entire posterior cord is lesioned; is medial rotation still possible? : : 15. A lesion of the nerve to the rhomboids (dorsal scapular nerve) proximal to the levator scapulae muscle results in uncompensated loss of retraction of the scapula. : : False – trapezius still retracts, cranial nerve 11 : FALSE was the intended answer. : : 16. A lesion of the musculocutaneous nerve within the axilla results in uncompensated loss of elbow flexion. : : True : FALSE was the intended answer. In fact all long nerves of the upper limb contribute to flexion at the elbow and, thus, compensation is possible. : : 17. A lesion of the posterior cord proximal to the upper subscapular nerve results in uncompensated loss of medial rotation. : : False – lateral pectoral and medial pectoral nerves still working : FALSE was the intended answer. : : : : : True/False : : : 1. Pectoralis major inserts, in part, at the lateral lip of the intertubercular sulcus and, thus, contributes to on osseofibrous tunnel for the tendon of the long head of the biceps. : : : 2. By definition, the medial lip of the intertubercular sulcus is within the axilla. : : : 3. The axillary sheath houses the axillary artery and the cords of the brachial plexus. : : : 4. Roots, trunks, divisions, cords, and branches define the parts of the axillary artery. : : : 5. The ventral root of C7 is both root and a trunk of the brachial plexus. : : : 6. The brachial plexus receives contributions from the dorsal rami. : : : 7. The trunks of the brachial plexus extend into the axilla. : : : 8. The middle subscapular nerve is also know as the thoracodorsal nerve and as the nerve to latissimus dorsi. : : : 9. The long thoracic nerve innervates serratus posterior inferior and serratus posterior superior and, thus, mediates stability of the scapula. : : : 10. The lower subscapular nerve innervates two muscles and each of these muscles laterally rotate the arm. : : : 11. The upper subscapular nerve innervates one muscle and this muscle is a medial rotator of the arm. : : : 12. The medial brachial cutaneous and medial antebrachial cutaneous nerves provide cutaneous sensation to the medial aspects of the arm and forearm respectively. : : : 13. The median nerve is formed by the medial and posterior roots of the median nerve. : : : 14. A lesion of the axillary nerve within the axilla will cause uncompensated loss of abduction and medial rotation of the arm. : : : 15. A lesion of the nerve to the rhomboids (dorsal scapular nerve) proximal to the levator scapulae muscle results in uncompensated loss of retraction of the scapula. : : : 16. A lesion of the musculocutaneous nerve within the axilla results in uncompensated loss of elbow flexion. : : : 17. A lesion of the posterior cord proximal to the upper subscapular nerve results in uncompensated loss of medial rotation.

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