Surgeons were able to reattach Irving’s amputated limb, sewing both the nerves and the blood vessels back together. After the surgery, which proceeded very well, the limb regained its blood supply almost immediately, but the limb remained motionless and Irving had no feeling in it for several months. Why did it take longer to reestablish innervation than circulation?

As Harry was falling off a ladder, he reached out and grabbed a tree branch with his hand. His overstretched upper limb became weak and numb. What major nervous structure had he injured?

Select the best answer or answers from the choices given: Identify the neuronal circuits described by choosing the correct response from the key.

Xena eventually catches Callisto (remember, she is 25 years old). Salmoneus, who is 60 years old, agrees to deliver Callisto to face charges for war crimes. On the way, their cart crashes down a ravine. Salmoneus also suffers damage to his spinal cord during the accident. Compare the likely degree of regeneration/recovery of his spinal cord with that of the injured skeletal muscles and describe the consequences of your observations for his quality of life and ability to remain active.