Blue Boxes II

Question 1

paralysis of serratus anterior

Answer 1

• damage to long thoracic nerve (superficial to serratus anterior)
• causes winged scapula (medial border of scapula moved laterally and posteriorly
• unable to abduct limb above horizontal (serratus anterior is unable to rotate glenoid cavity of scapula superiorly, but trapezius (CN XI) aids in motion and is unaffected)

Question 2

Thoracodorsal n. injury

Answer 2

C6-8

supplies latissimus dors
causes inability to raise trunk w/ upper limbs (climbing) or use a crutch
^require active depression of scapula