Muscles of the anterior thigh

This tutorial by Juan from Kenhub covers the anatomy of the anterior thigh muscles, focusing on the quadriceps femoris and sartorius. It details the origins, insertions, innervation, and functions of the quadriceps' four muscles: rectus femoris, vastus medialis, vastus lateralis, and vastus intermedius. The sartorius muscle is also discussed, highlighting its role in thigh and knee movements. The tutorial emphasizes the importance of the femoral nerve in innervating these muscles and the functional advantages of the patella in knee extension.

Which two main muscles comprise the anterior thigh muscles?

• Biceps femoris and sartorius

• Gluteus maximus and sartorius

• Quadriceps femoris and sartorius

• Adductor longus and sartorius

What is the primary nerve that innervates the quadriceps femoris?

• Tibial nerve

• Obturator nerve

• Femoral nerve

• Sciatic nerve

Which muscle of the quadriceps femoris is responsible for hip flexion?

• Vastus medialis

• Vastus lateralis

• Rectus femoris

• Vastus intermedius

What is one of the main functions of the vastus medialis?

• Internal rotation of the knee

• Extension of the hip

• Flexion of the hip

• External rotation of the knee

What advantage does the patella provide to the quadriceps femoris?

• Increases muscle length

• Decreases muscle power

• Increases torque and protects the knee

• Decreases knee stability

Where does the sartorius muscle originate?

• Ischial tuberosity

• Anterior superior iliac spine

• Linea aspera

• Greater trochanter

What is the insertion point of the sartorius muscle?

• Pes anserinus

• Tibial tuberosity

• Greater trochanter

• Linea aspera

Which nerve supplies the sartorius muscle?

• Femoral nerve

• Sciatic nerve

• Obturator nerve

• Tibial nerve

What movement is NOT performed by the sartorius muscle?

• External rotation of the thigh

• Flexion of the thigh

• Extension of the knee

• Abduction of the thigh

What is the sartorius muscle's role in the knee joint?

• Flexion and internal rotation

• Extension and external rotation

• Flexion and external rotation

• Abduction and external rotation