MSK - Muscles in the Anterior Compartment of the Thigh Flashcards Preview

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1

What are the muscles in the anterior compartment of the thigh innervated by?

The Femoral Nerve

2

Generally what action do the anterior thigh muscles perform?

Extend the leg at the knee joint

3

What are the three major muscles in the anterior compartment?

What other major muscle passes through the anterior muscle?

Pectineus, Sartorius, Quadriceps Femoris

he end of the Iliopsoas muscle passes through

4

What two muscles make up the Iliopsoas?

Why are they referred to as one muscle?

The psoas major and the iliacus

They originate in different areas but come together to form a tendon

5

What are the attachments of the Iliopsoas?

Psoas major originates from the lumbar vertebrae

Iliacus originates from the iliac fossa of the pelvis

They insert together onto the lesser trochanter of the femur

6

What are the actions of the Iliopsoas?

Unlike many of the anterior thigh muscles, the iliopsoas does not extend the leg at the knee joint

The iliopsoas flexes the lower limb at the hip joint and assists in lateral rotation at the hip joint

7

What is the innervation of the Iliopsoas?

The psoas major is innervated by anterior rami of L1-3, while the iliacus is innervated by the femoral nerve

8

What muscles does the Quadriceps Femoris muscle consist of?

Three vastus muscles and the rectus femoris

They form the main bulk of the thigh and collectively are one of the most powerful muscles in the body

9

Where does the Quadriceps Femoris attach?

Attaches to the patella via a tendon

The patella attahes to the tibia by the patella tendon

10

What is the action of the Quadriceps Femoris?

Main extensor of the knee

11

What are the three vastus muscles?

Vastus medialis

Vastus intermedius

Vastus lateralis

12

Collectively, what is the action of the vastus muscles?

Extend the knee joint

13

Collectively, what are the vastus muscles innervated by?

Innervated by the femoral nerve

14

What are the attachments of the Rectus Femoris?

Originates from the ilium, just superior to the acetabulum

It runs straight down the leg (the latin for straight is rectus)

Attaches to the patella by the quadriceps femoris tendon

15

What are the actions of the Rectus Femoris?

This is the only muscle of the quadriceps to cross both the hip and knee joints

It flexes the leg at the hip joint

Extends at the knee joint

16

What is the Rectus Femoris innervated by?

The Femoral Nerve

17

Describe the Sartorius

Longest muscle in the body

Long and Thin

Runs across the thigh in an inferomedial direction

Found more superfiially than other leg muscles

18

What are the attachments of the Sartorius?

Originates from the anterior superior iliac spine

Attaches to the superior medial surface of the tibia

19

What are the actions of the sartorius?

At the hip joint, it is a flexor, abductor and lateral rotator

At the knee joint, it is also a flexor

20

What is the innervation of the Sartorius?

The Femoral Nerve

21

Why could the Pectineus muscle be classified as either an anterior or medial compartment muscle?

Innervated by the femoral nerve which is characteristic of the anterior compartment

Actions are typical of the medial compartment

22

What are the attachments of the pectineus?

It originates from the pectineal line on the anterior surface of the pelvis

Attaches to the pectineal line on the posterior side of the femur, just inferior to the lesser trochanter

23

What are the actions of the Pectineus?

Adduction and flexion at the hip joint

24

What is the innervation of the pectineus?

The Femoral Nerve

25

What can be tested if femoral nerve damage is suspected?

The Quadriceps Femoris

26

How can the quadriceps femoris be tested?

Asking the patient to lie in a supine position, with the knee slightly flexed

Ask the patient to extend the leg, and resist the movement – the contraction of the quadriceps femoris should be visible.

27

What is the green highlighted muscle?

Light Green - Psoas Major

Dark Green - Iliacus

Overall - Iliopsoas

28

What is the muscle highlighted in yellow?

Rectus Femoris

29

What is the muscle highlighted in red?

Vastus Medialis

30

What is the muscle highlighted in blue?

Vastus Lateralis