Review Question - QID 219364

A 15-year-old female presents to your clinic with a chief complaint of ankle and foot pain. She is an avid ballet dancer and notes that her pain has slowly progressed over the past few months. A select image from her MRI, which was ordered by her primary care provider, is available for review in Figure A. The patient has pain with passive motion of the great toe and also has fullness about the posterior ankle. Which of the following accurately describes the origin of the muscle-tendon unit implicated in this patient's pathology?