Hand Spaces and Muscles

Which of the following muscles forms the medial boundary of the anatomical snuffbox?

A 32-year-old male carpenter from Delhi presents with a 3-day history of progressive swelling and severe pain in his right palm, particularly in the thenar region. He recalls a puncture wound from a rusty nail over the thenar eminence 4 days ago. On examination, the thenar eminence is tense, erythematous, and warm. There is severe pain on passive abduction of the thumb. Flexion of the thumb is weak and painful. Which anatomical space is most likely involved in this infection?

A 28-year-old female graphic designer from Bangalore presents with a 2-week history of progressive weakness and wasting of the muscles of her right hand, particularly affecting the thenar and hypothenar eminences. She also reports clumsiness with fine motor tasks and loss of sensation over the medial one-and-a-half fingers. On examination, there is marked atrophy of the first dorsal interosseous muscle and the adductor pollicis. Intrinsic hand muscles are weak, but extrinsic hand muscles (wrist and finger extensors) are normal. Which nerve is most likely compressed?

The thenar eminence is supplied by which of the following nerves?