Chapter·AnatomyDermatomes and myotomes

Segmental innervation patternsDownloads

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1

A 26-year-old woman presents with sudden-onset pain in her lower back. She says she was exercising in the gym several hours ago when she felt a sharp pain. The pain is radiating down the side of her leg and into her foot. On physical exam, her vital signs are as follows: HR 95, BP 120/70, T 37.2 degrees C. She has extreme pain shooting down her leg with a straight leg raise. Her sensation to light touch and pin-prick is intact throughout. Which of the following is the most likely diagnosis?

ACauda equina syndrome

BAnkylosing spondylitis

COsteomyelitis

DSpinal stenosis

EDisc herniation

2

A 68-year-old man presents to his primary care physician complaining of a bulge in his scrotum that has enlarged over the past several months. He is found to have a right-sided inguinal hernia and undergoes elective hernia repair. At his first follow-up visit, he complains of a tingling sensation on his scrotum. Which of the following nerve roots communicates with the injured tissues?

AS1-S3

BL1-L2

CS2-S4

DL4-L5

EL2-L3

3

A 25-year-old man comes to the physician because of a 2-week history of numbness in his left lower extremity. One month ago, he sustained a fracture of the neck of the left fibula during soccer practice that was treated with immobilization in a plaster cast. Physical examination of the left lower extremity is most likely to show which of the following findings?

ALoss of sensation over the medial calf

BImpaired dorsiflexion of the foot

CLoss of sensation on the sole of the foot

DInability to stand on tiptoes

EDecreased ankle reflex

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