Lumbar and Sacral Plexus

Question 1

subcostal

Answer 1

• T12
• motor
  
  • inferior to rib 12
• sensory
  
  • none

Question 2

iliohypogastric

Answer 2

• T12 and L1
• motor
  
  • internal oblique-transversus muscles
• sensory
  
  • skin above pubis and gluteal region

Question 3

ilioinguinal

Answer 3

• L1
• motor
  
  • internal oblique - transversus muscles
• sensory
  
  • skin over upper medial thigh, anterior scrotal & labial branches

Question 4

genitofemoral

Answer 4

• L1 and L2
• motor
  
  • genital branch: supplies cremaster and scrotum
• sensory
  
  • femoral branch, skin in femoral triangle

Question 5

lateral femoral cutaneous

Answer 5

• L2 and L3
• motor
  
  • none
• sensory
  
  • femoral branch; skin in femoral triangle

Question 6

femoral

Answer 6

• L2, L3, L4
• motor
  
  • quadriceps femoris, pectineal and sartorius muscles
• sensory
  
  • skin of ant. thigh, medial leg, hip and knee

Question 7

obturator

Answer 7

• L2, L3, L4
• motor
  
  • adductor group of muscles; superior gemellus and obturator internus
• sensory
  
  • skin on medial side of thigh except the small portion from ilioinguinal