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Questions and Answers
Which nerve innervates the Hamstrings?
What is the primary function of the Quadriceps?
Which muscle is NOT part of the Hamstrings?
What is a secondary function of the Hamstrings?
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How many muscles make up the Quadriceps?
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What is a function of the Quadriceps?
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Which muscle group is responsible for bending the knee?
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What is a secondary action of the Quadriceps?
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Which of the following muscles is NOT part of the Quadriceps?
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What is a common action of both the Quadriceps and Hamstrings?
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Study Notes
Thigh Muscles
Hamstrings
- A group of three muscles located in the posterior compartment of the thigh
- Responsible for flexing the knee and extending the hip
- Consist of:
- Biceps femoris (long head and short head)
- Semitendinosus
- Semimembranosus
- Innervated by the tibial nerve (L4-S2)
- Functions:
- Knee flexion
- Hip extension
- Assisting in external rotation of the hip
Quadriceps
- A group of four muscles located in the anterior compartment of the thigh
- Responsible for extending the knee
- Consist of:
- Rectus femoris
- Vastus lateralis
- Vastus medialis
- Vastus intermedius
- Innervated by the femoral nerve (L2-L4)
- Functions:
- Knee extension
- Assisting in stabilizing the patella
- Assisting in straightening the leg
Thigh Muscles
Hamstrings
- Located in the posterior compartment of the thigh
- Responsible for flexing the knee and extending the hip
- Consist of three muscles: biceps femoris (long head and short head), semitendinosus, and semimembranosus
- Innervated by the tibial nerve (L4-S2)
- Functions: knee flexion, hip extension, and assisting in external rotation of the hip
Quadriceps
- Located in the anterior compartment of the thigh
- Responsible for extending the knee
- Consist of four muscles: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius
- Innervated by the femoral nerve (L2-L4)
- Functions: knee extension, assisting in stabilizing the patella, and assisting in straightening the leg
Muscles of the Upper Leg
Quadriceps
- Composed of four muscles: Rectus femoris, Vastus lateralis, Vastus medialis, and Vastus intermedius
- Located on the front of the thigh
- Responsible for knee extension (straightening) and hip flexion (bending)
- Actions include:
- Straightening the knee from a bent position
- Helping to lock the knee in place
- Assisting in hip flexion during movements like walking or running
Hamstrings
- Composed of three muscles: Biceps femoris (long head and short head), Semitendinosus, and Semimembranosus
- Located on the back of the thigh
- Responsible for knee flexion (bending) and hip extension (straightening)
- Actions include:
- Bending the knee from a straight position
- Helping to slow down the knee during movements like running or jumping
- Assisting in hip extension during movements like standing up or climbing stairs
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Description
Learn about the hamstrings and quadriceps muscles in the thigh, their functions, and innervation. Understand their roles in knee flexion, hip extension, and external rotation.
