Spot test!

The hand is one of the most complex and beautiful pieces of natural engineering in the human body, allowing for such versatility from power grasp to precision manipulation. The anatomy is immensely intricate and needs a sound understanding to allow for its reconstruction. For all future ortho and plastic trainees you must know this anatomy well for those many hours spent on hand trauma presentations!

Question: With regards to the structure labeled A.

1. Name the structure.

2. Describe its origin.

3. Describe its insertion.

4. Describe its innervation.