Chapter 22

Question 1

The lumbosacral plexus supplies the entire muscular and cutaneous innervation to the?

Answer 1

Lower limb

Question 2

The lumbosacral plexus is formed from the ventral rami of spinal nerves

Answer 2

L1 through S4

Question 3

The lumbosacral plexus is often considered separately as the _____________ and the __________ because of 2 factors:
1) location
2) area of supply

Answer 3

1) lumbar plexus
2) sacral plexus

Question 4

The ___________- is located on the posterior wall of the abdomen within the substance of the _____ major muscle
The __________ is located against the lateral wall of the pelvis just medial to the ___________ muscle

Answer 4

1) Lumbar plexus
2) pons
3) sacral plexus
4) piriformis

Question 5

the ____________ primarily supplies structures on the lateral, anterior, and medial sides of the thigh
the ____________ primarily supplies structures of the gluteal region, posterior thigh, leg, and foot

Answer 5

1) Lumbar plexus
2) Sacral plexus

Question 6

The lumbar plexus is formed by the ventral rami of

Answer 6

L1, L2, and L3 and the upper division of the ventral ramus of L4

Question 7

The ventral ramus of L4 (furcal nerve) divides into the an upper and lower division
-The UPPER division takes part in the formation of the ________________
-The Lower division takes part in the formation of the ________________

Answer 7

1) Lumbar plexus
2) Sacral Plexus

Question 8

The femoral nerve arises from the ventral rami of?

Answer 8

L2 and L3 and the UPPER division of the ventral ramus of L4

Question 9

The femoral nerve is the LARGEST BRANCH of the

Answer 9

Lumbar plexus

Question 10

The femoral nerve emerges ____________ to the psoas major muscle

Answer 10

Lateral

Question 11

The femoral nerve passes __________ to the INGUINAL LIGAMENT and enters the ___________________ of the thigh

Answer 11

1) DEEP
2) Femoral triangle

Question 12

The obturator nerve arises from the ventral rami of?

Answer 12

L2 and L3 and the upper division of the ventral ramus of L4

Question 13

The obturator nerve emerges __________ to psoas major muscle

Answer 13

medial

Question 14

The obturator nerve courses along the ________________ of the __________ towards the obturator foramen

Answer 14

1) lateral wall
2) pelvis

Question 15

The obturator nerve terminates by dividing into _____________ and _____________ that course the obturator foramen

Answer 15

1) anterior branch of the obturator nerve
2) posterior branch of the obturator nerve

Question 16

The lumbosacral trunk is formed by the junction of the ______ division of the ventral ramus of L4 and the entire ramus of ______

Answer 16

1) LOWER
2) L5

Question 17

The lumbosacral trunk crosses the pelvic brim and enters into the formation of the ________________

Answer 17

sacral plexus

Question 18

The sacral plexus is formed by the ___________ of the ventral ramus of L4 and the ventral rami of L5 and S1 through __________

Answer 18

1) LOWER DIVISION
2) S4

Question 19

(formation of the sacral plexus nerves)
The LOWER DIVISION of the ventral ramus of L4, and the ventral rami of L5, S1, S2, and S3 join to form the?

Answer 19

Sciatic nerve

Question 20

(formation of the sacral plexus nerves)
The SUPERIOR GLUTEAL nerve consists of the ________________ of L4 and the ventral rami of L5 and S1

Answer 20

LOWER DIVISION

Question 21

(formation of the sacral plexus nerves)
the INFERIOR GLUTEAL nerve consists of the ventral rami of?

Answer 21

L5, S1, and S2

Question 22

(formation of the sacral plexus nerves)
The NERVE TO QUADTAUS FEMORIS AND INFERIOR GEMELLUS consists of the ______________ of L4 and the ventral rami of L5 and S1

Answer 22

LOWER DIVISION

Question 23

(Formation fo the sacral plexus nerves)
the NERVE TO OBTURATOR INTERNUS AND SUPERIOR GEMELLUS consists of the ventral rami of …

Answer 23

L5, S1, and S2

Question 24

(Formation of the sacral plexus nerves)
The NERVE TO PIRIFORMIS arises from the ventral rami of

Answer 24

S2

Question 25

(Formation of the sacral plexus nerves)
The POSTERIOR FEMORAL CUTANEOUS NERVE arises from the ventral rami of

Answer 25

S1, S2, and S3

Question 26

(Formation of the sacral plexus nerves)
The PUDENDAL NERVE arises from the ventral rami of

Answer 26

S2, S3 and S4

Question 27

The sciatic nerve arises from the ____________ of the ventral ramus of L4, and the ventral rami L5, and S1, S2, and S3. It is the _____________ in the body. It leaves the pelvis through the _______________________, BELOW the piriformis muscle. It courses inferiorly through the posterior thigh. The sciatic nerve is essentially a combination of __ nerves wrapped up in a _________________

Answer 27

1) Lower division
2) largest nerve
3) greater sciatic foramen
4) 2
5) Common epineurium

Question 28

The axons that courses through the _____________ nerve courses through the sciatic nerve as one single bundle of axons.

Answer 28

Common fibular nerve

Question 29

the axons that course through the ____________ course through the sciatic nerve as one single bundle of axons

Answer 29

Tibial nerve

Question 30

In describing the innervation of muscles supplied by the sciatic nerve, one can be more exact by describing an innervation as being from the _______________________________________________

Answer 30

“tibial part of the sciatic nerve” or the “common fibular part of the sciatic nerve”

Question 31

In some rare instances, the common epineurium does not form around both portions by rather separately around the tibial portion and separately around the common fibular portion. What would you see occurring in these individuals?

Answer 31

1) The these individuals, there is no sciatic nerve but rather a tibial nerve and a common fibular nerve arising directly from the sacral plexus
2) similarly, a high bifurcation of the sciatic nerve can occasionally occur

Question 32

1) Which is correct?
a. The lumbar plexus supplies structures on the lateral, anterior, and medial sides of the thigh
b. Lumbosacral plexus is formed by ventral rami of spinal nerves L4 through S1
c. The sacral plexus is located on the posterior wall of the abdomen
d. The lumbosacral plexus supplies the entire muscular and cutaneous innervation of the upper limb

Answer 32

a. The lumbar plexus supplies structures on the lateral, anterior, and medial sides of the thigh

Question 33

2) Which is incorrect?
a. Femoral nerve passes deep to the inguinal ligament
b. Lumbar plexus is formed by ventral rami of L1, L2, L3, and the upper division of L4 (wrong answer)
c. The femoral nerves arises from ventral rami of L2
d. Obturator nerve emerges lateral to the psoas major muscle

Answer 33

d. Obturator nerve emerges lateral to the psoas major muscle

Question 34

3) Which is correct?
a. Femoral nerve is the largest branch of the lumbar plexus
b. Femoral nerve arises from the ventral rami of L1,L2, and L3
c. Femoral nerve emerges medial to the psoas major muscle
d. Femoral nerve is the largest branch of the sacral plexus

Answer 34

a. Femoral nerve is the largest branch of the lumbar plexus

Question 35

4) Which is incorrect?
a. Obturator nerve courses along the lateral wall of the pelvis towards the obturator foramen
b. Obturator nerve terminates by dividing into the medial and lateral branches of the obturator nerve
c. The upper division of the ventral ramus of L4 takes part in the formation of the lumbar plexus
d. Lumbosacral trunk crosses the pelvic brim

Answer 35

b. Obturator nerve terminates by dividing into the medial and lateral branches of the obturator nerve

Question 36

5) Which is incorrect?
a. Sciatic nerve courses inferiorly through posterior thigh
b. Sciatic nerve leaves the pelvis through the greater sciatic foramen, above the piriformis muscle
c. Nerve to piriformis arises from ventral ramus of S2
d. Sciatic nerve is the largest nerve in the body

Answer 36

b. Sciatic nerve leaves the pelvis through the greater sciatic foramen, above the piriformis muscle