Brown Review (josh) LE ANATOMY

Question 1

there are how many major nerves of the LE?

Answer 1

4

Question 2

What are the 2 major nerve Plexuses that innervate the LE

Answer 2

Lumbar plexus

Lumbosacral plexus

Question 3

What does the Lumbar plexus innervate?

Answer 3

ventral aspects of LE

Question 4

What does the Lumbasacral plexus innervate?

Answer 4

Dorsal aspect of LE

Question 5

The LUMBAR PLEXUS is formed from the ventral rami of the first ___ ___ nerves and part of the ___ ____ nerve

Answer 5

three lumbar
fourth lumbar
(L1-4)

Question 6

In approximatly 1/2 of pt’s a small branch of the ____ ___ nerve joins the 1st lumbar nerve

Answer 6

12 thoracic

Question 7

The cephalad portion of the lumbar plexus ( i.e. L1 and sometimes T12) Splints into ____ and ____ branches

Answer 7

Superior

Inferior

Question 8

The superior branch redivides into the ______ and _____ nerves

Answer 8

Iliohypogastric n.

ilioinguinal n.

Question 9

The smaller Inferior branch joins with the small superior branch of the L2 n. to form the _______n.

Answer 9

Genitofemoral n.

Question 10

the ilioHYPOGASTRIC n. penetrates the what? and supplies motor fibers to the what?
It ends it’s anterior cutaneous branch to the skin of the _______ region, and a lateral cutaneous branch in the ____ region?

Answer 10

• transverse abdominis muscle (near the crest of the ilium)
• abdominal musculature
• supraPubic region — Hip region

Question 11

The ilioIinquinal n. crosses slightly ______ tot he ilioHYPOGASTRIC n.

Answer 11

inferior

Question 12

The ilioIinquinal n. crosses slightly Inferior to the ilioHYPOGASTRIC n. it then traverses the inquinial canal and ends cutaneously in branches to the ____ and near the _____

Answer 12

• upper and medial parts of the thigh

- anterior scrotal n.

Question 13

The genitofemoral n divides at a variable level into the ____ and _____ branches.

Answer 13

genital

femoral

Question 14

the genital branch of the genitofemoral n. is small; it enters the inguinal canal deep at the inguinal ring and supplies what?

Answer 14

Cremaster muscle
skin and fascia of scrotum
adjacent parts of thigh

Question 15

The femoral branch is more medial of the 2 branches and continues under the inguinal ligament, and supplies the what?

Answer 15

skin over the femoral triangle (lateral to that supplied by the ilioinguinal n.

Question 16

What 3 nerves are clinically inportant during regional block for inguinal hernia or other groin procedures?

Answer 16

Ilioinguinal
Iliohypogastric
Genitofemoral

Question 17

Caudal to the Ilioinguinal, iliohypogastric, and genitofemoral nerves are the three MAJOR nerves of the lumbar plexus that exit from the pelvis anteriorly and innervate the lower extremity. ehat are those 3 lovely maror nerves of the lumbar plexus I speak about?

Answer 17

Lateral femoral cutaneous
Femoral
Obturator

Question 18

The lateral femoral cutaneous n. passes under the lateral end of the inguinal ligament, it provides _____ innervation to where?

Answer 18

–Cutaneous
lateral portion of buttocks distal to the greater trochanter and to the proximal 2/3rds of lateral aspect of thigh
(lateral butt and proximal lateral 2/3rds thigh)

Question 19

the obturator n. descends along the MEDIAL POSTERIOR aspect of the psoas muscle and through the pelvs to the obturator canal into the thigh. this nerve supplies what?

Answer 19

adductor group of muscles
the hip and knee joints
skin of the medial aspect of thigh proximal the knee

Question 20

which nerve is the largest branch of the LUMBAR plexus

Answer 20

Femoral n.

Question 21

slightly before , or on, entering the the femoral triangle of the upper thigh, the femoral nerve breaks into numerous branches supplying the muscles and skin of what?

Answer 21

anterior thigh
knee
hip joints

Question 22

The lumbosacral plexus is formed by the ventral rami of what nerves?

Answer 22

L4-5 and S1-3 (occasionally part of S4)

Question 23

What is the nerve of primary interest in the Lumbosacral plexus

Answer 23

Sciatic

sometimes the posterior femoral cutaneous n.

Question 24

The sciatic is the combination of 2 major nerve trunks. what are they?

Answer 24

Tibial nerve

common peroneal

Question 25

The tibial n. off the sciatic is derived from where? and the Common peroneal n. is derived from where?

Answer 25

Tibial- anterior branches of ventral rami L4-S3

Common Peroneal- DORSAL branches on the ventral rami of L4-S3

Question 26

The Tibial and Common peroneal pass as the sciatic n.through the upper leg until they get to the _____ _____ where the divide

Answer 26

Popliteal Fossa