USMLE Step 1 Review 01 18 Anatomy Knee Function

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Play USMLE Audio MP3 01 18 Anatomy Knee Function Below

Begin 01 18 Anatomy Knee Function Transcription

We have four motions at the knee: extension, flexion, outward and inward rotation.

Please give the muscle and nerve for extension.

• Quadriceps femoris muscle/femoral nerve L2, L3, L4.

Group and nerve for flexion at the knee?

• The hamstring muscles, all sciatic nerve.

Muscle, nerve and levels for outward rotation?

• Biceps femoris muscle, that’s outward rotation when the knee is flexed, sciatic nerve L1-S3.

Inward rotation with the knee flexed?

• Semimembranous muscle/sciatic nerve L1-S2.

Name the muscle, nerve and cord levels for flexion at the knee.

• Hamstrings, biceps femoris, semitendinous, semimembranous, all sciatic nerve L1-S3.

Let’s turn it around. Give motion, nerve and levels for the following muscles.

Quadriceps femoris?

• Extension of the knee, femoral nerve L2-L4.

Biceps femoris by itself?

• When the knee is flexed, outward rotation, sciatic nerve L1-S3.

Semimembranous muscle by itself?

• When the knee is flexed, inward rotation, sciatic nerve L2-S2.

The hamstrings?

• Flexion, sciatic nerve L1-S3.

Student-doctor, please pause the tape and summarize the four motions of the knee with muscles, nerves and levels. Again, start with the motions.

• Extension, flexion, outward and inward rotation. For extension, quadriceps femoris/femoral nerve L2-L4. For flexion, hamstring muscles, biceps femoris, semitendinous and semimembranous and all sciatic nerves L1-S3. Outward rotation with the knee flexed, biceps femoris muscle/sciatic nerve L1-S3. And inward rotation with the knee flexed, semimembranous muscle/sciatic nerve L1-S2.

****END OF TRANSCRIPTION****

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