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Worksheet Posterior Medial Thigh

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					                            HLTH451: Advanced Human Anatomy
                                       Fall 2007

                       Posterior Thigh, Glut and Posterior Knee Regions
                                    Laboratory Worksheet


NAME                                       Section                Date

Dissection Instructions:

   1.     Skin removal: Using a scalpel, make incisions according the lines indicated in the
          diagram. Do not make the incision along line AB. Your area of responsibility extends
          to the distal popliteal fossa. Remove the skin and superficial fascia in this area.




   2.     Identify the gluteus maximus muscle. The proximal attachment of this muscle is the
          sacrum, ilium, coccyx and sacrotuberous ligament. Remove the fascia lata from this
          area.

   3.     Separate the gluteus maximus muscle from the gluteal aponeurosis. Insert your fingers
          deep into the space and palpate the inferior gluteal artery, gluteal vein and gluteal
          nerve. Cut the gluteus maximus muscle from its origin and reflect this muscle laterally.
          You will have to cut the gluteal artery, vein and nerve to complete this action.

   4.     Identify the gluteus medius muscle. Identify the piriformis muscle. Identify the nerves
          and blood vessels inferior to this muscle.

   5.     Identify the sciatic nerve. Identify the obturator internus and gemelli superior and
          gemelli inferior muscles. Identify the quadratus femoris muscle. Identify the tensor
          fascia lata muscle.
6.   Clean the sciatic nerve distally. Identify the long head of the biceps femoris muscle.
     Identify the short head of the biceps femoris muscle. Identify the semitendinosus and
     semimembranosus muscles.

7.   Identify the division of the sciatic nerve into the tibial and common fibular nerves.
     Follow the path of these two nerves distally.

8.   Identify the borders of the popliteal fossa. Pull the heads of the gastrocnemius apart for
     about 5 cm. Identify the common connective tissue that contains the popliteal artery
     and popliteal vein. Open this sheath and separate these two structures. Identify the
     superior lateral and superior medial genicular arteries.

9.   Identify the attachment site called the pes anserine. What muscles make up this
     attachment.
Laboratory Questions:

1. Osteology: On a skeleton in the laboratory, identify the following bony structures: Greater
   sciatic notch, PSIS, ischial spine, ischial tuberosity, sacrotuberous ligament, linea aspera.

2. Muscular system: Complete the chart below including origin, insertion, action (with an
   asterisk on major actions), innervation and blood supply for the following muscles: biceps
   femoris, semitendinosus, semimembranosus, adductor magnus, adductor brevis, gracilis,
   gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae.

3. What 2 palpable bone landmarks can be used to identify the location of the sciatic nerve?




4. What spinal nerves contribute to the:

       a. Sciatic nerve

       b. Tibial nerve

       c. Peroneal nerve


5. Which area (quadrant) of the gluteal region appears to be the safest location for
   administering an intra-muscular injection and avoid danger encountering significant nerves
   and blood vessels?




6. Where is the iliotibal band in relation to the greater trochanter?




7. Where is the sciatic nerve in relation to the piriformis on this body? Where else is it
   occasionally located?




8. Describe the texture of the gluteus maximus. Does it differ in any way from other muscles
   observed in dissection?
9. Observe and describe the insertion of the gluteus maximus. What muscle appears to be
   most directly antagonistic to it?




10. Identify all bony landmarks and structures on the dissection list that you can palpate.




11. What tissues or structures might interfere with the ability to feel a pulse in the popliteal
    artery?




12. Which hamstring has an attachment of the joint capsule of the knee?



13. List all arteries that supply the knee joint.




14. What are the borders of the popliteal space? Which muscle is partially visible in this
    space?




15. Where is the greatest mass of adductor magnus located (proximal or distal)?




16. What four major muscles originate on or very close to the ischial tuberosity?




17. At what level does the sciatic nerve divide into its two components?
18. What ligament is surrounded by the tendon of the biceps femoris as it inserts on the head
    of the fibula?



19. What is the most inferior of the ligaments that attach to the sacrum and the pelvis? What
    joint does it reinforce?




20. Personal Observations
Muscle               Origin   Insertion   Action   Innervation   Blood Supply

Biceps femoris


Semitendinosis


Semimembranosis


Adductor magnus


Gracilis


Gluteus medius


Gluteus maximus


Gluteus minimus


Tensor fascia lata


Adductor brevis

				
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