1.3.2. The Sacral Plexus Flashcards Preview

Nessy Anatomy MSK Lower Limb > 1.3.2. The Sacral Plexus > Flashcards

Flashcards in 1.3.2. The Sacral Plexus Deck (49)
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1

What is the Sacral Plexus?

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

2

Where is the Sacral Plexus located?

1. It is located on the Surface of the Posterior Pelvic Wall
2. Anterior to the Piriformis Muscle

3

What forms the Sacral Plexus?

1. The Anterior Rami of the of Spinal Nerve S1
2. The Anterior Rami of the of Spinal Nerve S2
3. The Anterior Rami of the of Spinal Nerve S3
4. The Anterior Rami of the of Spinal Nerve S4
(5. The Anterior Rami of the of Spinal Nerve L4 also contributes)
(6. The Anterior Rami of the of Spinal Nerve L5 also contributes)

4

How do the Spinal Nerves leave the Spinal Cord?

Via the Intervertebral Foramina of the Vertebral Column

5

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

They divide into Anterior and Posterior Fibers (or Rami)

6

What happens to the Anterior Rami of S1-S4?

They intertwine (The Sacral Plexus) and divide into several cords

7

1. Which Lumbar Roots join the Anterior Rami of S1-S4?
2. What do they combine to form?

1. a) L4
1. b) L5
2. Lumbosacral Trunk

8

Where does the Lumbosacral Trunk travel?

Into the Pelvis

9

What does the Lumbosacral Trunk join?

The Sacral Plexus

10

What do the Cords which leave the Sacral Plexus goes on to form?

Major Peripheral Nerves of the Sacral Plexus

11

What are the Major Peripheral Nerves of the Sacral Plexus?

1. Superior Gluteal Nerve
2. Inferior Gluteal Nerve
3. Sciatic Nerve
4. Posterior Femoral Cutaneous Nerve
5. Pudendal Nerve

12

What are the 2 main destinations of the Major Peripheral Nerves of the Sacral Plexus?

1. Leaving the Pelvis to the Gluteal Region
2. Remaining in the Pelvis

13

Which Major Peripheral Nerves of the Sacral Plexus leave the Pelvis, to the Gluteal Region?

1. Superior Gluteal Nerve
2. Inferior Gluteal Nerve
3. Sciatic Nerve
4. Posterior Femoral Cutaneous Nerve

14

Which Major Peripheral Nerves of the Sacral Plexus remain in the Pelvis?

The Pudendal Nerve

15

How does the Superior Gluteal Nerve leave the Pelvis?

Via the Greater Sciatic Foramen

16

Where does the Superior Gluteal Nerve enter into the Gluteal Region, in relation to the Piriformis Muscle?

Superiorly

17

What accompanies the Superior Gluteal Nerve as it enters into the Gluteal Region?

1. Superior Gluteal Artery
2. Superior Gluteal Vein

18

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

1. L4
2. L5
3. S1

19

What is the motor function of the Superior Gluteal Nerve?

1. Innervation of the Gluteus Minimus Muscle
2. Innervation of the Gluteus Medius Muscle
3. Innervation of the Fascia Lata

20

What is the sensory function of the Superior Gluteal Nerve?

There is none

21

How does the Inferior Gluteal Nerve leave the Pelvis?

Via the Greater Sciatic Foramen

22

Where does the Inferior Gluteal Nerve enter into the Gluteal Region, in relation to the Piriformis Muscle?

Inferiorly

23

What accompanies the Inferior Gluteal Nerve as it enters into the Gluteal Region?

1. Inferior Gluteal Artery
2. Inferior Gluteal Vein

24

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

1. L5
2. S1
3. S2

25

What is the motor function of the Inferior Gluteal Nerve?

Innervation of the Gluteus Maximus

26

What is the sensory function of the Inferior Gluteal Nerve?

There is none

27

What is the significance of the Sciatic Nerve?

1. It is the longest Nerve in the body
2. It is a thick, flat band - about 2cm

28

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

1. L4
2. L5
3. S1
4. S2
5. S3

29

Where is the Sciatic Nerve derived from?

The Lumbosacral Plexus

30

How does the Sciatic Nerve leave the Pelvis?

Via the Greater Sciatic Foramen