Enumerate the contents of posterior compartment of thigh.
The posterior compartment of the thigh contains the knee flexors and hip extensors.It has the following muscles, nerves and vessels:
• Muscles (Hamstring Muscles)
o Semimembranosus
o Semitendinosus
o Biceps femoris
o Ischial part of adductor magnus
• Nerves
o Sciatic nerve
o Posterior cutaneous nerve of thigh
• Blood vessels
o Vascular anastomosis between the branches of four perforating branches of profundal femoris artery.
What are the common characteristic features of hamstring muscles?
The Hamstring muscles include (all the muscles of posterior compartment of thigh EXCEPT short head of biceps femoris):
- Semimbranosus
- Semitendinousus
- Long head of biceps femoris
- And ischial fibers of adductor magnus
They have the following characteristic features:
- They take origin from ischial tuberosity
- They are inserted beyond the knee joint, on tibia or fibula.
- They are supplied by tibial part of sciatic nerve (short head of biceps femoris is supplied by common peroneal nerve).
- They are extensors of hip joint and flexors of knee joint
Write the origin, insertion and action of muscles of posterior compartment of thigh.
| Muscle | Origin | Insertion | Action | Nerve supply |
|---|---|---|---|---|
| Semimembranosus | Superolateral part of upper quadtrilateral area of ischial tuberosity | Horizontal groove on the posterior aspect of medial condyle of tibia | Hip joint- Extension | Tibial part of Sciatic nerve |
| Knee joint – Flexion, in semiflexed knee – medial rotation | ||||
| Muscle | Origin | Insertion | Action | Nerve supply |
|---|---|---|---|---|
| Semitendinosus | Inferomedial part of upper quadtrilateral area of ischial tuberosity | Upper part of medial surface of tibia | Hip joint- Extension | Tibial part of Sciatic nerve |
| Knee joint – Flexion, in semiflexed knee – Medial rotation | ||||
| Muscle | Origin | Insertion | Action | Nerve supply |
|---|---|---|---|---|
| Biceps femoris | Long head: Inferomedial part of upper quadtrilateral area of ischial tuberosity | Head of fibula in front of styloid process | Hip joint- Extension | Tibial part of Sciatic nerve |
| *Short head: Lateral lip of linea aspera and upper 2/3rd of supracondylar line. | Knee joint – Flexion, in semiflexed knee – Lateral rotation | Common peroneal part of sciatic nerve | ||
| Muscle | Origin | Insertion | Action | Nerve supply |
|---|---|---|---|---|
| Ischial part of adductor magus | Inferolateral part of lower triangular area of ischial tuberosity . | Adductor tubercle | Hip joint- Extension | Tibial Part of sciatic nerve |
Ischial part of adductor magnus was primitively inserted on medial condyle of tibia, which got subsequently shifted to adductor tubercle. The tibial collateral ligament represents the primitive insertion.
excellent content
Nice ..best chosen questions. 🙃🥰
i feel sad for my self that i got this app before one day of my annual exam
i wish i would meet this app early :{
fabulous app , now im gonna recommend my junior to visit this app
Nice app
Thanks Shein