Nerves and Vessels LL

Question 1

Name the major divisions of the Lumbar Plexus,
and the rami of origin

Answer 1

Origin L1 - L4

Femoral n., L2 - L4 (anterior thigh)
Obturator n., L2 - L4 (medial thigh)

Question 2

Name the major branches of the Sacral Plexus, and the rami of origin

Answer 2

Origin S1 - S4 (with contributions from L4 - L5)

Sciatic n., L4 - S3

Question 3

List the cutaneous innervation and key anatomy of the Femoral n.

Answer 3

anterior thigh
medial leg and foot

Contained in the Femoral Triangle

Question 4

List the cutaneous innervation and key anatomy of the Obturator n.

Answer 4

Superior and medial-most thigh

Through the Obturator Foramen
A branch can be seen superficial to Adductor Brevis

Question 5

Name the cutaneous innervation and key anatomy of the Sciatic n.

Answer 5

No remarkable cutaneous innervation

Travels through the Greater Sciatic Foramen
Emerges inferior to Piriformis
Courses deep to the Hamstrings

Question 6

Name the major branches of the Sciatic n., and location of branch

Answer 6

Branching at the apex of the Popliteal Fossa
Tibial n. (medial)
Common Fibular n. (lateral)

Question 7

Name the branches of the Common Fibular n., and location of the branch

Answer 7

Branch near the anterior neck of the Fibula

Deep Fibular n.
Superficial Fibular n.

(after wrapping around the lateral knee joint)

Question 8

Name the cutaneous innervation and key anatomy of the Tibial n.

Answer 8

heel and plantar skin (via L&M Plantar nn.)

Passes between heads of Gastrocnemius
Passes through the Tarsal Tunnel

Question 9

Name the cutaneous innervation and key anatomy of the Deep Fibular n.

Answer 9

Small wedge of skin between Hallux and 2

Travels deep within the anterior leg muscles
Passes deep to the Extensor Retinaculum
Continues deep to the dorsal fascia

Question 10

Name the cutaneous innervation and key anatomy of the Superficial Fibular n.

Answer 10

Lateral leg, and much of the dorsum of the foot

Travels among the lateral leg muscles
Passes superficial to the Extensor Retinaculum
and superficial to the dorsal fascia

Question 11

Abdominal Aorta
branches to ___

Answer 11

Left and Right Common Iliac Arteries

Question 12

(L&R) Common Iliac Artery
Branches to

Answer 12

External and Internal Iliac arteries

Question 13

What is the path of the External Iliac Artery?

Answer 13

The External Iliac Artery passes under the ingunal ligament and the hip bone, after which its name changes to

Femoral Artery

Question 14

Where does the Femoral a. change its name to Popliteal a.?

What structure does it pass through at this point?

Answer 14

The Popliteal Artery begins after the Femoral Artery passes through the Adductor Hiatus, and into the Popliteal Fossa.

Question 15

Beyond the popliteal fossa, what are the two main branches of the Popliteal Artery?

Answer 15

Posterior Tibial a.
Anterior Tibial a.

Question 16

Describe the path of the Posterior Tibial Artery

Answer 16

Posterior leg to Tarsal Tunnel

Bends anteriorly toward the Plantar region

Branches into the Medial and Lateral Plantar aa.

Question 17

What is the path of the anterior tibial artery?

Answer 17

Travels anteriorly to the tibia and under the extensor retinaculum, where it becomes the Dorsalis Pedis artery.

Question 18

What is the beginning location for superficial venous return in the lower limb?

Answer 18

The Dorsal Venous Arch

Question 19

Describe the path of the Greater Saphenous Vein

Answer 19

The Greater Saphenous Vein is the medial branch of the Dorsal Venous Arch

Medial leg, knee, and thigh

Goes deep to the fascia inferior to the Femoral Triangle, where it flows into the Femoral Vein.

Question 20

How are deep veins of the leg named?

Answer 20

The deep veins of the leg run in pairs parallel to arteries of the same name.

They are referred to as Venae Comitantes - accompanying veins.