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Anatomy 10

A 6-week-old baby boy presents to the clinic for evaluation. The mother is concerned that her baby is having difficulty moving his left arm. The prenatal course was unremarkable. The baby was born via vaginal delivery at full-term and weight 8 pounds 9 ounces at birth. The mother mentions that the baby's head became stuck and that they required forceps to pull the baby out. Physical examination reveals a healthy baby whose weight is 10 pounds 6 ounces with an appropriate length and head circumference. There is absent deltoid and biceps function in the left arm. Function in the left hand seems to be normal.

Which of the following nerve roots were most likely damaged in this patient?

  • A) C3-C4
  • B) C4-C5
  • C) C5-C6
  • D) C6-C7
  • E) C8-T1


Kevin Patel


Dr. Ted O'Connell

Last updated

Sep 08, 2022


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