MSK - Posterior Thigh Muscles Flashcards Preview

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Flashcards in MSK - Posterior Thigh Muscles Deck (19):
1

What are the three muscles that form the hamstrings?

- Biceps Femoris

- Semitendinosus (most superficial)

- Semimebranosus

2

What is the origin of biceps femoris?

- Long head = Ischial Tuberosity

- Short head = Linea aspera of the femur

3

Where does biceps femoris insert?

Heads converge to form a tendon that attaches at the head of the fibula

4

What is the arterial supply of biceps femoris?

Deep femoral artery and perforating arteries

5

What are the actions of biceps femoris?

- Flexion of the leg at the knee

- Lateral rotation of the knee when flexed

- Long head = extension of the leg at the hip

6

What is the origin of semitendinosus?

Ischial tuberosity

7

Where does semitendinosus insert?

Posteriomedial surface of the tibia

8

What is the innervation of semitendinosus?

Tibial part of the sciatic nerve (L5-S2)

9

What is the arterial supply of semitendinosus?

Inferior gluteal artery and perforating arteries

10

What are the actions of semitendinosus?

- Flexion of the leg at the knee

- Extension of the leg at the hip

- Some medial rotation

11

What is the innervation of biceps femoris?

- Long head = tibial part of the sciatic nerve (L5-S2)

- Short head = fibular part of the sciatic nerve (L5-S2)

12

What is the origin of semimembranosus?

Ischial tuberosity (but is superior to other muscles)

13

Where does semimembranosus insert?

Medial tibial condyle

14

What is the innervation of semimembranosus?

Tibial part of the sciatic nerve (L5-S2)

15

What is the arterial supply of semimembranosus?

- Profunda femoris

- Gluteal arteries

16

What are the actions of semimembranosus?

- Flexion of the leg at the knee

- Extension of the thigh at the hip

- Medial rotation of the leg at both the knee and hip joints

17

Describe a hamstring strain. When are these most likely to occur?

- Excessive stretching/tearing of the muscle fibres

- Seen in athletes involved in running/kicking sports

18

What can happen as a result of a hamstring strain?

Muscle damage can rupture the surrounding blood vessels which causes a haematoma that is contained in the fascia lata to form

19

What is an avulsion fracture? What happens with an avulsion fracture of the ischial tuberosity?

- The breaking away of a small part of a bone from its main body

- Hamstrings tear off a piece of the ischial tuberosity usually during an activity that requires rapid contraction/relaxation of the muscles e.g. football

Decks in ESA 2 Class (63):