What is the spinal origin of the nerve that innervates the flexor digitorum profundus?• C8 and T1C5 and C6C5 - C7C3 - T1C6 - T1

Breakdown of the Problem

1. Identify the specific nerve that innervates the flexor digitorum profundus muscle.
2. Determine the spinal nerve roots involved in innervating this muscle.

Relevant Concepts

1. The flexor digitorum profundus is primarily innervated by the median and ulnar nerves.
2. The median nerve arises from the C5, C6, C7, C8, and T1 spinal nerves, while the ulnar nerve arises from the C8 and T1 spinal nerves.

Analysis and Detail

1. The flexor digitorum profundus muscle flexes the distal interphalangeal joints of the fingers.
2. The median nerve innervates the lateral part (the muscles controlling the index and middle fingers), while the ulnar nerve innervates the medial part (the muscles controlling the ring and little fingers).

Verify and Summarize

• Considering the spinal roots:
  • From the median nerve: C5, C6, C7, C8, T1
  • From the ulnar nerve: C8, T1
• Since both the median and ulnar nerves innervate parts of the flexor digitorum profundus, we focus on their common spinal roots.

Final Answer

The spinal origin of the nerve that innervates the flexor digitorum profundus is C8 and T1.