Podcast
Questions and Answers
Which nerve innervates the Hamstrings?
Which nerve innervates the Hamstrings?
What is the primary function of the Quadriceps?
What is the primary function of the Quadriceps?
Which muscle is NOT part of the Hamstrings?
Which muscle is NOT part of the Hamstrings?
What is a secondary function of the Hamstrings?
What is a secondary function of the Hamstrings?
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How many muscles make up the Quadriceps?
How many muscles make up the Quadriceps?
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What is a function of the Quadriceps?
What is a function of the Quadriceps?
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Which muscle group is responsible for bending the knee?
Which muscle group is responsible for bending the knee?
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What is a secondary action of the Quadriceps?
What is a secondary action of the Quadriceps?
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Which of the following muscles is NOT part of the Quadriceps?
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?
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.
