The posterior thigh

Question 1

Where do the muscles of the posterior thigh attach?

Answer 1

-Isschial tuberosity (except short head of biceps-> linear aspera)

Question 2

Name the muscles in the posterior thigh from medial to lateral?

Answer 2

• Adductor magnus
• Semimembranosus
• Semitendinosus
• Biceps femoris long head
• Biceps femoris shirt head underneath long head

Question 3

What is the function of adductor Magnus?

Answer 3

• ADduction
• Extension of the hip
• Internal rotation of the hip

Question 4

What is the function of Semimembranosus?

Answer 4

• Extension of the hip joint

- Flexion and internal rotation of the knee joint

Question 5

What is the function of semitendinosus?

Answer 5

• Extension of the hip joint

- Flexion and internal rotation of the knee joint

Question 6

What is the function of biceps femoris?

Answer 6

• Long head -> Flexion and external rotation of the knee

- Short head -> Flexion of the knee

Question 7

What forms the aponeurosis of the knee?

Answer 7

-The tendon of biceps femoris

Question 8

Describe the nerve supply to the posterior thigh

Answer 8

• Sciatic nerve enters posterior thigh through greater sciatic foramen
• Branches into the tibial and common fibular nerve
• Pass down into the leg and tibial nerve supplies all posterior thigh muscles except short head of biceps femoris which is common fibular nerve

Question 9

Describe the blood supply to the posterior thigh

Answer 9

• Perforating branches of the deep artery of the thigh serves the posterior thigh
• Inferior gluteal and popliteal artery also contributes

Question 10

What artery passes through adductor Magnus into posterior thigh and into the leg?

Answer 10

-femoral artery

Question 11

What are the most common injuries of the posterior thigh?

Answer 11

• Muscle strain from excessive stretch or tearing

- Avulsion fracture of ischial tuberosity