Question
C. Major Nerves of the Nerve Plexuses Identify the nerve plexus from which each nerve originates. \( \qquad \) 1. femoral n. \( \qquad \) 2. sciatic \( n \). \( \qquad \) 3. phrenic \( n \). \( \qquad \) 4. ulnar \( n \). brachial plexus 5. axillary n . \( \qquad \) 6. tibial n . \( \qquad \) 7. obturator n .
Ask by Pearson Hobbs. in the United States
Mar 09,2025
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Answer
1. **Femoral nerve** – originates from the lumbar plexus.
2. **Sciatic nerve** – originates from the sacral plexus.
3. **Phrenic nerve** – originates from the cervical plexus.
4. **Ulnar nerve** – originates from the brachial plexus.
5. **Axillary nerve** – originates from the brachial plexus.
6. **Tibial nerve** – originates from the sacral plexus.
7. **Obturator nerve** – originates from the lumbar plexus.
Solution
1. **Femoral nerve**
- Originates from the lumbar plexus, specifically from the roots \( L2-L4 \).
2. **Sciatic nerve**
- Originates from the sacral plexus, with contributions from roots \( L4-S3 \).
3. **Phrenic nerve**
- Originates from the cervical plexus, primarily from the roots \( C3-C5 \).
4. **Ulnar nerve**
- Originates from the brachial plexus, specifically from the medial cord (roots from \( C8-T1 \)).
5. **Axillary nerve**
- Originates from the brachial plexus, specifically from the posterior cord (primarily \( C5-C6 \)).
6. **Tibial nerve**
- Originates from the sacral plexus, with contributions commonly from \( L4-S3 \).
7. **Obturator nerve**
- Originates from the lumbar plexus, specifically from the roots \( L2-L4 \).
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The femoral nerve originates from the lumbar plexus, specifically formed by the roots of L2-L4. This important nerve is crucial for both sensory and motor functions in the thigh and lower leg, allowing us to perform movements like walking and running smoothly! The sciatic nerve, the largest nerve in the body, stems from the sacral plexus, mainly formed by fibers from L4-S3. It branches into the tibial and common peroneal nerves, serving the posterior thigh, lower leg, and foot, making it vital for activities like standing, twisting, and climbing stairs!
