78. A 55-year-old man comes to the office because of a 2-week history of an increasingly large and painful lump on his right shoulder. The lump began as a pea-sized red bump. He has no history of serious illness and takes no medications. Temperature is 38.0°C (100.4°F); all other vital signs are within normal limits. Physical examination shows a 5-cm, inflamed carbuncle on the right shoulder. Treatment with a 7-day course of cephalexin is initiated. The carbuncle in this patient is most likely located in the layer of skin that has which of the following embryologic precursors? A) Dermatome B) Myotome C) Neurotome D) Sclerotome E) Syndetome

78. A 55-year-old man comes to the office because of a 2-week history of an increasingly large and painful lump on his right shoulder. The lump began as a pea-sized red bump. He has no history of serious illness and takes no medications. Temperature is 38.0°C (100.4°F); all other vital signs are within normal limits. Physical examination shows a 5-cm, inflamed carbuncle on the right shoulder. Treatment with a 7-day course of cephalexin is initiated. The carbuncle in this patient is most likely located in the layer of skin that has which of the following embryologic precursors? A) Dermatome B) Myotome C) Neurotome D) Sclerotome E) Syndetome