Lumbar and Sacral plexus

Question 1

what are the roots of lumbar plexus

Answer 1

L1 L2 L3 L4

Question 2

where is the site of the lumbar plexus

Answer 2

it originates in the posterior abdominal wall inside the substance of psoas major muscle, anterior to the transverse process of the lumbar vertebrae

Question 3

what are the branches of lumbar plexus

Answer 3

iliohypogastric nerve
ilioingual nerve
genitofemoral nerve
lateral cutaneous nerve of the thigh
obturator nerve
femoral nerve

Question 4

function of the lumbar plexus

Answer 4

it supplies the anterolateral abdominal wall, external genitals and represents one of the main motor and sensory nerve supply of the lower limb

Question 5

what does iliohypogastric and ilioingual supply?

Answer 5

give motor supply yo muscles of abdominal wall

Question 6

what does the genitofemoral nerve supply?

Answer 6

sensory supply to external genitals and upper anterior thigh

Question 7

what does the lateral cutaneous nerve of the thigh supply?

Answer 7

sensory supply to the lateral thigh

Question 8

what does the femoral nerve supply?

Answer 8

supplies the muscles of the anterior compartment of the thigh+skin of anterior thigh

Question 9

what does the obturator nerve supply?

Answer 9

supplies muscles of the medial compartment of the thigh as well as skin of the medial thigh

Question 10

femoral nerve injury?

Answer 10

weakness in flexion of the hip and extension of the knee due to impairment of muscles of the anterior compartment of the thigh

Question 11

obturator nerve injury?

Answer 11

weakness in adduction of the thigh

Question 12

what are the roots of the sacral plexus?

Answer 12

L4 L5 S1 S2 S3 S4

Question 13

where is the site of the sacral plexus

Answer 13

it originates in relation to the anterior surface of the pirisformis muscle

Question 14

what are the branches of the sacral plexus?

Answer 14

sciatic nerve
pudenal nerve
superior gluteal nerve
inferior gluteal nerve
posterior cutaneous nerve of the thigh
pelvis splanchnic nerve
perforating cutaneous nerve
direct branch to muscles of the pelvic wall and floor and lower limb

Question 15

function of the sacral plexus

Answer 15

the sacral plexus supplies the muscles of the pelvis, perineum and contribute to the motor and sensory supply of the lower limb

Question 16

what does the sciatic nerve supply?

Answer 16

supplies the posterior compartment of the thigh in addition to the muscles of leg and foot

Question 17

what does the pudenal nerve supply?

Answer 17

its the main nerve to the perineum

Question 18

what does the superior and inferior gluteal nerves supply?

Answer 18

gluteal muscle

Question 19

what does the posterior cutaneous nerve of the thigh supply

Answer 19

sensory supply to the posterior compartment of the thigh

Question 20

what does the pelvis splanchnic nerve supply?

Answer 20

delivers parasympathetic supply to the pelvis

Question 21

what does the direct muscular branch supply?

Answer 21

include nerve to quadratus femoris nerve to obturator internus nerve to piriformis muscle as well as nerve to levator ani coccygeus and external anal sphincter