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How many skeletal muscles are present in the human body?
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10. Muscles
Muscle Actions
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To allow for flexion, which muscle unlocks the knee joint?
A
Popliteus
B
Rectus femoris
C
Biceps femoris
D
Gastrocnemius
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Understand the anatomy of the knee joint: The knee joint is a hinge joint that allows for flexion and extension. It is stabilized by ligaments and muscles, and unlocking the knee is necessary for initiating flexion.
Learn the role of the popliteus muscle: The popliteus is a small muscle located at the back of the knee. Its primary function is to 'unlock' the knee joint by rotating the femur laterally on the tibia when the leg is fixed, or medially rotating the tibia when the leg is free.
Compare the functions of the listed muscles: Rectus femoris is part of the quadriceps group and primarily extends the knee. Biceps femoris is part of the hamstring group and assists in knee flexion but does not unlock the knee. Gastrocnemius is a calf muscle that contributes to plantar flexion and assists in knee flexion but does not unlock the knee.
Identify the correct muscle for unlocking the knee: The popliteus muscle is specifically responsible for unlocking the knee joint to allow flexion, making it unique among the listed muscles.
Conclude that the popliteus muscle is the correct answer based on its anatomical function of unlocking the knee joint to initiate flexion.
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