Exam 3- Lumbar Plexus

Question 1

The lumbar plexus is formed by the anterior primary rami of

Answer 1

L1-L3 and part of L4

And sometimes contribution from T12

Question 2

What do the muscular branches of the anterior rami supply what muscles

Answer 2

Quadratus lumborum, psoas major, psoas minor

Question 3

L1 muscular branch will supply

Answer 3

The quadratus lumborum and psoas minor

Question 4

L2 muscular branch supplies

Answer 4

Quadratus lumborum and both psoas muscles

Question 5

L3 and L4 muscular branches supply

Answer 5

Quadratus lumborum and psoas major

Question 6

What fibers supplies iliohypogastric nerve

Answer 6

T12 and L1

Question 7

What is the path of the iliohypogastric nerve

Answer 7

Anterior and inferior between quadratus lumborum and the kidney. Then travels through the transverse abdominal muscle and travels between it and the internal abdominal oblique

Question 8

THe iliohypogastric nerve gives off a branch named

Answer 8

Lateral cutaneous branch

Question 9

What does the lateral cutaneous branch supply

Answer 9

The posterolateral gluteal region

Question 10

THe lateral cutaneous branch continues as the

Answer 10

Anterior cutaneous branch which supplies skin over pubic region

Question 11

What two muscles are supplied by iliohypogastric nerve

Answer 11

Internal abdominal oblique

Transverse abdominal

Question 12

What fibers make up ilioinguinal nerve

Answer 12

T12 and L1

Question 13

What is the path of the ilioinguinal nerve

Answer 13

Transmitted through the inguinal canal. Leaves canal through superficial inguinal ring and travels with the spermatic cord

Question 14

What sensory info does the ilioinguinal nerve supply

Answer 14

Skin of the upper medial thigh, also supplies the base of the penis and anterior scrotum in men. Female supplies mons pubis and labium majus

Question 15

What two muscles does ilioinguinal nerve supply

Answer 15

Internal abdominal oblique

Transverse abdominal

Question 16

What fibers make up genitofemoral

Answer 16

L1 and L2

Question 17

What is the course of the genitofemoral nerve

Answer 17

Passes anteriorward through the psoas major muscle and then divides

Question 18

What does the genitofemoral nerve divide into after passing through psoas major

Answer 18

Genial branch

Femoral branch

Question 19

The genital branch travels through inguinal canal and provides motor supply to what muscle

Answer 19

Cremaster

Question 20

What sensory info does the cremaster supply

Answer 20

Skin of superior anterior scrotum in males and skin for females of mons pubis and labium majus

Question 21

What sensory info does the femoral branch supply

Answer 21

Passes POSTERIOR to the inguinal ligament and supplies skin of the upper anterior thigh

Question 22

What fibers make up the lateral cutaneous nerve of the thigh

Answer 22

L2 and L3

Question 23

True or False

THe lateral cutaneous nerve of the thigh is purely sensory

Answer 23

TRUE- supplies skin of the lateral thigh, superior to the knee

Question 24

What is the path of the lateral cutaneous nerve of the thigh

Answer 24

Passes UNDER the inguinal ligament and travels ANTERIOR to sartorius and THROUGH fascia lata to reach the skin

Question 25

What is the largest branch of the lumbar plexus

Answer 25

Femoral nerve

Question 26

What is the path of the femoral nerve

Answer 26

forms POSTERIOR to the psoas major and emerges LATERAL to psoas and anterior illacus. Passes POSTERIOR to the inguinal ligament and enters femoral triangle just lateral to femoral artery. Runs INFERIOR and MEDIALLY through the adductor canal and into the leg, MEDIALLY to the knee

Question 27

Where are the two areas that the femoral nerve only gives off branches

Answer 27

Abdomen

Femoral triangle

Question 28

Within the abdomen the femoral nerve gives off muscular branches to

Answer 28

Iliacus and pectineus. Also some fibers to femoral artery

Question 29

When does the femoral nerve divide into an anterior and posterior division

Answer 29

After it is beyond the inguinal ligament

Question 30

The anterior division of femoral nerve gives off 3 nerves

Answer 30

Intermediate cutaneous nerve of the thigh

Medial cutaneous nerve of the thigh

Nerve to the sartorius

Question 31

The intermediate cutaneous nerve of the thigh supplies

Answer 31

The skin on the anterior thigh down to the knee. The lateral branch communicates with the femoral branch of genitofemoral nerve

Question 32

The medial cutaneous nerve of the thigh path is

Answer 32

Crosses ANTERIOR to the femoral artery and sends branches to the skin of the medial thigh, medial knee, knee across to the lateral side of the patella. Some supply skin of medial leg

Question 33

How does the medial cutaneous nerve of the thigh supplies the skin of the medial leg through communicantions with

Answer 33

The saphenous nerve

Question 34

The posterior division of the femoral nerve gives muscular branches that supply __________ and vascular branches _________.

Answer 34

Quadriceps, femoral artery

Question 35

The muscular branches of the posterior division of femoral nerve suppluy

Answer 35

Sartorius, rectus femoris

Vastus lateralis, medialis, intermedialis