Review Question - QID 215727

A 37-year-old recreationally active male presents to the clinic for evaluation of chronic pain in his right heel cord. He states that he experienced an audible pop in his ankle 3 months ago while snowboarding. On exam, there is a palpable defect along the mid substance of the Achilles tendon and the patient is unable to actively plantarflex the ankle against gravity. He elects to pursue operative intervention. During surgery, 3.5cm of scar tissue is resected. It is decided to augment the reconstruction with a local tendon autograft. Which of the following correctly describes the anatomy of the tendon that is most suitable for augmentation?