Organization of lower limb

Question 1

superficial fascia

Answer 1

fatty layer and membranous layer

* superficial inguinal lymph nodes, subcu bv, , and nerves between the 2 layers

Question 2

Deep Fascia – Fascia Lata

Answer 2

superior deep fascia

1. gluteal aponeurosis
2. intermuscular septa
3. IT tract
4. Saphenous vein opening

Question 3

Deep Fascia – Crural Fascia

Answer 3

Extension of fascia lata below the knee

1. Intermuscular Septa
2. Retinacula
3. Fascia of dorsum of foot
4. Plantar Fascia

Question 4

Lymph nodes of lower limb

Answer 4

DIPS

1. Popliteal - in popliteal fossa
2. Superficial Inguinal - inferior to inguinal ligament. T shaped.
3. Deep Inguinal - deep to fascia lata, within femoral triangle, medial to femoral vein
4. Iliac Nodes - external, internal, common along the paths of those vessels.

Question 5

Motor Innervation of Lower Limb

Answer 5

1. Spinal cord segments L2-4, via femoral and obturator nerves, L4-S3 from sacral plexus via sciatic N and braches
2. Femoral N (L2,3,4)
3. Obturator N (L2,3, 4)
4. Sciatic N ( L4,5; S1,2,3)

Question 6

Sensory Innervation of Lower Limb

Answer 6

Cutaneous: Lumbar and Sacral Plexus - ventral rami of spinal N L1-S2 and dorsal rami of spinal nerves L1-L3 and S1-S3

Dermatomes: Spinal cord L1-S2. Spiral around from lateral to medial.

Question 7

Dermatomes
L4 
S1,2 
S1
S2

Answer 7

L4 - anterior to greater trochantor - patella, medial malleolus, great toe
S1,2 - middle of posterior thigh and leg
S1 - lateral malleolus
S2 - medial plantar surface of heel

L4,5 and S1 cross the dorsum of the foot from MEDIAL to LATERAL

Question 8

Femoral Nerve
where it enters
what it innervates

Answer 8

Enters femoral triangle, deep to inguinal ligament

• Motor and sensory branches while in triangle
• Innervates anterior femoral muscles and skin of anterior thigh, medial leg, medial foot

Question 9

Obturator Nerve
-Where it Enters
Muscles it innervates

Answer 9

Enters via obturator canal

• Motor inneravation to adductor muscles of thigh
• Cutaneous innervation to medial thigh

Question 10

Sciatic Nerve

• where it exits
• branches
• innervations

Answer 10

• exits via greater sciatic foramen
• course through posterior thigh to bifurcate in popliteal fossa
• Branches: tibial and common fibular
• Innervations: posterior thigh, leg, plantar muscles
• Cutaneous: to areas above