QUIZ 6 NERVE SUPPLY

Question 1

• from dorsal divisions of ventral rami L-2, L-3 & L-4
• nerve of the anterior femoral compartment
• passes into the thigh deep to the inguinal ligament, lateral to the
  femoral artery and through the muscular lacuna
• supplies muscular innervation to pectineus, sartorius, quadriceps femoris, articularis genu and the following cutaneous nerve branches

Answer 1

femoral nerve

Question 2

• from dorsal divisions of ventral rami L-2, L-3
• one branch exits deep fascia of the thigh slightly inferior to the fossa ovalis and passes inferomedially (usually along the course of sartorius muscle and near the great saphenous vein)
• supplies the anteromedial aspect of the thigh
• contributes to the patellar plexus
• other branch remains deep to sartorius muscle and contributes to the subsartorial plexus, may be a small branch

Answer 2

Medial Femoral Cutaneous Nerve of the femoral nerve

Question 3

• from dorsal divisions of ventral rami L-2 & L-3
• exits fascia lata near the fossa ovalis and passes inferiorly, usually over the rectus femoris muscle
• often pierces sartorius muscle prior to exiting fascia lata
• supplies the central part of the anterior aspect of the thigh
• contributes to the patellar plexus

Answer 3

Intermediate Femoral Cutaneous Nerve of the femoral nerve

Question 4

• from dorsal divisions of ventral rami L-3 & L-4
• travels with the femoral artery and vein in the adductor canal
• exits the deep fascia at the posteroinferomedial aspect of the thigh or
  superoanteromedial aspect of the leg
• supplies the skin of medial ½ of the leg and patellar surface
• contributes to the subsartorial plexus
• infrapatellar branch contributes to the patellar plexus

Answer 4

Saphenous Nerve of the femoral nerve

Question 5

• from ventral divisions of ventral rami L-2, L-3 & L-4
• nerve of the medial femoral compartment
• passes into the thigh via the obturator canal and divides into its two branches

Answer 5

Obturator Nerve

Question 6

anterior branch

• sends a branch to the hip joint upon exiting the obturator canal
• passes medially, posterior to pectineus and adductor longus muscles and anterior to adductor brevis muscle - provides muscular innervation to adductor longus, gracilis and adductor brevis muscles
• contributes to the subsartorial plexus

Answer 6

anterior branch of the obturator nerve

Question 7

posterior branch
- pierces the obturator externus muscle, and provides muscular innervation
- passes distal and medial, posterior to adductor brevis muscle and anterior
to adductor magnus muscle
- supplies obturator externus and adductor magnus, except hamstring part
- provides a branch to the knee joint which pierces the oblique popliteal ligament (this branch follows the femoral and popliteal arteries)

Answer 7

posterior branch of the obturator nerve

Question 8

• from dorsal divisions of ventral rami L-4, L-5, S-1 & S-2 and ventral divisions of ventral rami L-4, L-5, S-1, S-2 & S-3
• nerve of the posterior compartment
• exits the pelvis via the greater sciatic foramen, usually inferior to piriformis m.
• travels inferiorly, deep to the long head of the biceps femoris muscle, to the superior edge of the popliteal fossa
• at the popliteal fossa it divides into its 2 component parts

Answer 8

sciatic nerve

Question 9

• from ventral divisions of ventral rami L-4, L-5, S-1, S-2 & S-3
• passes inferiorly through the popliteal fossa and into the leg

Answer 9

tibial nerve

Question 10

• from dorsal divisions of ventral rami L-4, L-5, S-1 & S-2
• passes along the inferior edge of the biceps femoris tendon to the fibula where it passes in an anteroinferior direction around the head of the fibula
• can palpate the nerve at the fibular head

Answer 10

Common Fibular Nerve / Common Peroneal Nerve of the sciatic nerve

Question 11

• from dorsal divisions of ventral rami S-1 & S-2 and ventral divisions of ventral rami S-2 & S-3
• sensory nerve in posterior femoral compartment

Answer 11

Posterior Femoral Cutaneous Nerve