1.3.1. The Lumbar Plexus Flashcards Preview

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Flashcards in 1.3.1. The Lumbar Plexus Deck (56)
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1

What is the Lumbar Plexus?

A network of Nerve Fibers, which supplies the Skin and Musculature of the Lower Limb

2

Which muscle is the Lumbar Plexus related to?

It is located within the Substance of the Psoas Major

3

Where is the Lumbar Plexus located, in relation to the Lumbar Vertebrae?

Anterior to the Transverse Process of the Lumbar Vertebrae

4

What forms the Lumbar Plexus?

1. The Anterior Rami of the of Spinal Nerve L1
2. The Anterior Rami of the of Spinal Nerve L2
3. The Anterior Rami of the of Spinal Nerve L3
4. The Anterior Rami of the of Spinal Nerve L4
(5. The Anterior Rami of the of Spinal Nerve T12 also contributes)

5

How do the Spinal Nerves leave the Spinal Cord?

Via the Intervertebral Foramina of the Vertebral Column

6

What happens to the Nerves, after they leave the Spinal Cord?

They divide into Anterior and Posterior Fibers (or Rami)

7

What happens to the Anterior Rami of L1-L4?

They intertwine (The Lumbar Plexus) and divide into several cords, which then go on to form the Major Peripheral Nerves of the Lumbar Plexus

8

How many Major Peripheral Nerves of the Lumbar Plexus are there?

6

9

Where do the 6 Peripheral Nerves of the Lower Limb travel?

These descend down the Posterior Abdominal Wall

10

What are the 6 Major Peripheral Nerves of the Lower Limb?

1. Iliohypogastric Nerve
2. Ilioinguinal Nerve
3. Genitofemoral Nerve
4. Lateral Cutaneous Nerve of the Thigh
5. Obturator Nerve
6. Femoral Nerve

11

Where does the Iliohypogastric Nerve travel?

1. It runs across the Quadratus Lumborum Muscle of the Posterior Abdominal Wall, to the Iliac Crest
2. It then perforates the Transverse Abdominis

12

What happens to the Iliohypogastric Nerve after it perforates the Transverse Abdominis?

It divides into its Terminal Branches

13

What is the Segmental (or Root) Value of the Iliohypogastric Nerve?

1. L1
2. (Contributions from) T12

14

What is the motor function of the Iliohypogastric Nerve?

1. Innervation of the Transverse Abdominis
2. Innervation of the Internal Oblique

15

What is the sensory function of the Iliohypogastric Nerve?

Innervation of the Posterolateral Gluteal Skin

16

Is the Ilioinguinal Nerve larger than the Iliohypogastric Nerve?

No

17

Where does the Ilioinguinal Nerve travel?

1. It runs across the Quadratus Lumborum Muscle of the Posterior Abdominal Wall, to the Iliac Crest
2. It then perforates the Transverse Abdominis
3. It then passes through the Superficial Inguinal Ring

18

What is the Segmental (or Nerve Root) Value of the Ilioinguinal Nerve?

L1

19

What is the motor functions of the Ilioinguinal Nerve?

1. Innervation of the Transverse Abdominis
2. Innervation of the Internal Oblique

20

What is the sensory function of the Ilioinguinal Nerve?

1. Innervation of the Skin on the Upper Medial Thigh
2. a) Innervation of the Skin over the Root of the Penis and Anterior Scrotum
2. b) Innervation of the Skin over the Mons Pubis and Labia Majora

21

What happens to the Genitofemoral Nerve, after it leaves the Psoas Major?

It divides into 2 Branches

22

What are the 2 Branches the Genitofemoral Nerve?

1. Genital Branch of the Genitofemoral Nerve
2. Femoral Branch of the Genitofemoral Nerve

23

What is the Segmental (or Nerve Root) Value of the Genitofemoral Nerve?

1. L1
2. L2

24

What is the motor function of the Genital Branch of the Genitofemoral Nerve?

Innervation of the Cremasteric Muscle

25

What is the motor function of the Femoral Branch of the Genitofemoral Nerve?

There is none

26

What is the sensory function of the Genital Branch of the Genitofemoral Nerve?

1. a) Innervation of the Skin over the Anterior Scrotum
1. b) Innervation of the Skin over the Mons Pubis and Labia Majora

27

What is the sensory function of the Femoral Branch of the Genitofemoral Nerve?

The Skin on the Upper Anterior Thigh

28

Where does the Lateral Cutaneous Nerve of the Thigh, enter the Thigh?

At the Lateral Aspect of the Ilioinguinal Ligament

29

What is the Segmental (or Nerve Root) Value of the Lateral Cutaneous Nerve of the Thigh?

1. L2
2. L3

30

What is the motor function of the Lateral Cutaneous Nerve of the Thigh?

There is none