Hamstrings

Question 1

Main Muscles of the Hamstrings

Answer 1

Biceps femoris:
- Long Head
- Short Head

Semimembranosus

Semitendinosus

Question 2

Biceps Femoris

Answer 2

Origin:
The long head originates from the ischial tuberosity, and the short head originates from the posterior shaft of the femur.

Attachment:
Both heads insert on the head of the fibula.

Function:
flexing the knee, extending the hip, and lateral rotation of the leg.

Nerve Supply:
sciatic nerve,

Blood Supply:
popliteal artery.

Question 3

Semimembranosus

Answer 3

Origin:
It originates from the ischial tuberosity.

Attachment:
the medial condyle of the tibia.

Function:
This muscle is responsible for flexing the knee and extending the hip. It also helps with medial rotation of the leg.

Nerve Supply:
the sciatic nerve.

Blood Supply:
popliteal artery.

Question 4

Semitendinosus:

Answer 4

Origin:
Like the other hamstrings, it originates from the ischial tuberosity.

Attachment:
The semitendinosus inserts on the upper, medial surface of the tibia.

Function:
It plays a role in knee flexion and hip extension, along with contributing to the medial rotation of the leg.

Nerve Supply:
sciatic nerve.

Blood Supply:
popliteal artery

Question 5

What are the similar Functions of the Hamstring Muscles?
What is the difference?

Answer 5

They all contribute to:
- Knee Flexion
- Hip Extension

The Biceps Femoris LATERALLY rotates the leg
Semimembranosus and Semitendinosus MEDIALLY rotate the leg

Question 6

What is the order of the Hamstring Muscles from Lateral to Medial?

Answer 6

Lateral Leg

Biceps Femoris - Short head
Biceps femoris - Long Head
Semitendinosus
Semimembranosus

Medial Leg

Question 7

Which of the Hamstring Muscles are Intrinsic, and which are Extrinsic?

Answer 7

Intrinsic:
- Semibranosus & Semitendinosus

Extrinsic:
- Biceps Femoris