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Flashcards in MSK - Cutaneous Innervation of the Lower Limb Deck (35)
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1

Define cutaneous innervation

"an area of skin supplied by a specific nerve

2

Where do cutaneous branches arise from and where do they travel?

Arise from mixed nerves and travel into the subcutaneous tissue

3

Where do the majority of the mixed nerves arise from in the lower limb?

Lumbar and Sacral plexuses

4

Where are the two places that the cutaneous nerves can arise from?

1 - Directly from the lumbar or sacral plexuses

2 - As cutaneous branches of the mixed nerves that arise from the lumbar or sacral plexusus

5

Where is the lumbar plexus located?

What roots does it consist of?

Anterior to the transverse processes of the lumbar spine

L1 to L4 (with some contribution from T12)

6

Generally, where do the nerves arising from the lumbar plexuses supply?

Anterior and Medial thigh

7

What are some major nerves that arise from the lumbar plexus?

Obturator Nerve (L2-L4)

Femoral Nerve (L2-L4)

8

What spinal roots make up the Sacral Plexus?

L5-S4

9

What areas does the sacral plexus supply?

What is its main branch?

Posterior thigh, leg and foot

Sciatic Nerve

10

What are the three major nerves of the lower limb?

Femoral Nerve

Tibial Nerve

Common Fibular Nerve

11

What cutaneous innervation of the lower limb in the femoral nerve responsible for?

Anteriomedial thigh

Medial Leg and Foot

12

What is a mixed nerve?

Which major leg nerve is a mixed nerve?

Contained sensory and motor functions

Femoral Nerve

13

What plexus does the femoral nerve arise from?

Describe the course of the femoral nerve

The lumbar plexus

Descends through the psoas major muscle and enters the lower limb on the anterior aspect of the thigh

14

What two cutaneous nerves arise from the femoral nerve?

Anterior cutaneous branches

Saphenous Nerve

15

Where does the saphenous nerve arise?

Describe the course of the saphenous nerve

Arises in the femoral triangle

Descends down the thigh, via the adductor canal, exits the canal just before the adductor hiatus, crossing the medial aspect of the knee and passing deep to the sartorius tendon

16

Where does the saphenous nerve supply?

Skin on the medial side of the leg and foot

17

Where do the anterior cutaneous branches arise from?

Where do these nerves innervate?

Arise in the femoral triangle

Innervate the skin of the aterior and medial aspects of the thigh

18

What cutaneous innervation is the tibial nerve responsible for?

Posterolateral leg

Sole

Heel

19

The tibial nerve is one of the terminal branches of what?

The sciatic nerve

20

Where does the tibial nerve arise?

Describe the course of the tibial nerve

Apex of the popliteal fossa

Descends down the posterior compartment of the leg

21

Name the cutaneous branches of the tibial nerve

Sural Nerve

Medial Plantar Nerve

Lateral Plantar Nerve

Calcaneal Nerves

22

What is the sural nerve formed by?

Where does it supply?

Branches of the tibial and common fibular nerves

Supplies the skin of the posterolateral leg and the lateral margin of the foot

23

Where does the medial plantar nerve supply?

Skin of the medial sole of the foot, and the plantar aspect, nails and sides of the medial three and a half toes

24

Where does the Lateral Plantar Nerve supply?

Skin of the lateral sole, and the plantar aspect, nails and sides of the lateral one and a half toes

25

Where does the Calcaneal nerve supply?

Skin of the heel

26

Label cutaneous innervation to the posterior leg

27

Label the cutaneous innervation to the sole of the foot

28

What cutaneous innervation is the common fibular nerve responsible for?

Anterolateral leg, posterolateral leg and the dorsal surface of the foot

29

Where does the common fibular nerve arise?

Where does it enter?

Apex of the popliteal fossa

Enters the lateral compartment

30

What are the cutaneous branches of the common fibular nerve?

Superficial fibular nerve (Mixed)

Deep fibular nerve (Mixed)

Sural nerve

Lateral Sural Nerve