Posted by lae2 on August 11, 2013 at 16:12:59:
1. The gluteus medius lies deep to the the gluteus maximus and superficial to the gluteus minimus.
2. The gluteus medius lies anterior to the gluteus maximus and posterior to the gluteus minimus.
3. The inferior gemellus originates from the ischial tuberosity and blends with the tendon of the obturator externus.
4. The superior gemellus arises from the ischial spine and blends with the the tendon of the obturator internus.
5. The superior gluteal nerve travels transversely deep to the gluteus medius and superficial to gluteus minimus toward the tenser fascia lata.
6. piriformis, superior gemellus, obturator internus, inferior gemullus, and quadratus femoris make up 5 short lateral rotators of the hip.
7. The origins of the superior and inferior gemeli are interrupted by the greater sciatic notch.
8. The superior gluteal nerve and the sciatic nerve enter the gluteal region by passing superior to the piriformis.
9. he lumbar plexus receives ventral rami, but not dorsal rami, from spinal nerves.
10. The lumbar plexus, a somatic plexus, elaborates the femoral and obturator nerves (non-exhaustive).
11. The sacral plexus, a somatic plexus, elaborates the sciatic nerve, superior gluteal nerve, and inferior gluteal nerve (non-exhaustive).
12. A peripheral nerve derived from a plexus typically contributes to more than one dermatome.
13. A spinal nerve contributes to one dermatome only.
14. A dermatomal region of anesthesia indicates spinal nerve damage (eg. herniated disc).
15. A cross-dermatomal region of anesthesia indicates damage to a peripheral nerve (eg. nerve entrapment).
Essay
1. What is meant by a functional reversal of origin and insertion? Discuss the anatomy and function of gluteus medius and minimus.
2. What is meant by a functional reversal of origin and insertion? Discuss the anatomy and function of the popliteus muscle.
3. Discuss why the superior lateral gluteal quadrant is preferable for an injection site relative to each of the remaining 3 quadrants.
4. An injection into the upper medial quadrant of the gluteal region could cause both pelvic sag and foot drop. Explain.