MSK - Muscles of the Posterior Compartments of the Thigh Flashcards Preview

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Flashcards in MSK - Muscles of the Posterior Compartments of the Thigh Deck (21):
1

What are the muscles in the posterior compartment of the thigh collectively known as?

Hamstrings

2

What is the innvervation of the hamstrings?

The Sciatic Nerve

3

What is the name of the muscle highlighted in red?

How many heads does it have?

Biceps Femoris

2

4

Which side of the posterior knee can the short head of the Biceps Femoris be felt?

Lateral

5

What are the attachments of the Biceps Femoris?

Long Head - Originates from the ischial tuberosity of the pelvis

Short Head - Originates from the linea aspera on posterior surface of the femur

Together - The heads form a tendon, which inserts into the head of the fibula

6

What is the main action of the Biceps Femoris?

What else does the Biceps Femoris do?

Main - Flexion at the knee

Also extends the leg at the hip and laterally rotates the hip and the knee

7

What is the innervation of the Biceps Femoris?

Sciatic Nerve

8

What is the name of the muscle highlighted in blue?

Semitendinosus

9

What are the attachments of the Semitendinosus?

It originates from the ischial tuberosity of the pelvis, and attaches to the medial surface of the tibia

10

What are the actions of the Semitendinosus?

Flexion of the leg at the knee joint

Extension of thigh at the hip

Medially rotates the thigh at the hip join and the leg at the knee joint

11

What is the innervation of the Semitendinosus?

Sciatic Nerve

12

What is the name of the muscle highlighted in yellow?

Semimembranous

13

What are the attachments of the Semimembranosus?

It originates from the ischial tuberosity, but does so more superiorly than the semitendinosus and biceps femoris. It attaches to the medial tibial condyle

14

What are the actions of the Semimembranosus?

Flexion of the leg at the knee joint

Extension of the thigh at the hip

Medially rotates the thigh at the hip joint and the leg at the knee joint

15

What is the innervation of the Semimembranosus?

Sciatic Nerve

16

What does a hamstring strain refer to?

How are they often injured?

Excessive stretch or tearing of the muscle fibres

During sports that involve kicking or running

17

What is damage to the muscle fibers also likely to damage?

What would this produce?

How would it be contained?

Surrounding blood vessels

Produces a haematoma

Contained by overlyng fascia lata

18

How should a hamstring muscle strain be treated?

RICE Protocol

Rest

Ice

Compression

Elevation

19

What has happened here?

Avulsion Fracture of the Ischial Tuberosity

20

What is an avulsion fracture?

When a fragments of bone breaks away from the main body of bone

21

How does an avulsion fracture of the ischial tuberosity occur?

During what activities does an avulsion fracture usually occur?

Hamstring tendons "tear off" a piece of ischial tuberosity

During sports that require rapid contraction and relaxation of the muscles