Chapter 22 Flashcards
The lumbosacral plexus supplies the entire muscular and cutaneous innervation to the?
Lower limb
The lumbosacral plexus is formed from the ventral rami of spinal nerves
L1 through S4
The lumbosacral plexus is often considered separately as the _____________ and the __________ because of 2 factors:
1) location
2) area of supply
1) lumbar plexus
2) sacral plexus
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
1) Lumbar plexus
2) pons
3) sacral plexus
4) piriformis
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
1) Lumbar plexus
2) Sacral plexus
The lumbar plexus is formed by the ventral rami of
L1, L2, and L3 and the upper division of the ventral ramus of L4
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 ________________
1) Lumbar plexus
2) Sacral Plexus
The femoral nerve arises from the ventral rami of?
L2 and L3 and the UPPER division of the ventral ramus of L4
The femoral nerve is the LARGEST BRANCH of the
Lumbar plexus
The femoral nerve emerges ____________ to the psoas major muscle
Lateral
The femoral nerve passes __________ to the INGUINAL LIGAMENT and enters the ___________________ of the thigh
1) DEEP
2) Femoral triangle
The obturator nerve arises from the ventral rami of?
L2 and L3 and the upper division of the ventral ramus of L4
The obturator nerve emerges __________ to psoas major muscle
medial
The obturator nerve courses along the ________________ of the __________ towards the obturator foramen
1) lateral wall
2) pelvis
The obturator nerve terminates by dividing into _____________ and _____________ that course the obturator foramen
1) anterior branch of the obturator nerve
2) posterior branch of the obturator nerve
The lumbosacral trunk is formed by the junction of the ______ division of the ventral ramus of L4 and the entire ramus of ______
1) LOWER
2) L5
The lumbosacral trunk crosses the pelvic brim and enters into the formation of the ________________
sacral plexus
The sacral plexus is formed by the ___________ of the ventral ramus of L4 and the ventral rami of L5 and S1 through __________
1) LOWER DIVISION
2) S4
(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?
Sciatic nerve
(formation of the sacral plexus nerves)
The SUPERIOR GLUTEAL nerve consists of the ________________ of L4 and the ventral rami of L5 and S1
LOWER DIVISION
(formation of the sacral plexus nerves)
the INFERIOR GLUTEAL nerve consists of the ventral rami of?
L5, S1, and S2
(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
LOWER DIVISION
(Formation fo the sacral plexus nerves)
the NERVE TO OBTURATOR INTERNUS AND SUPERIOR GEMELLUS consists of the ventral rami of …
L5, S1, and S2
(Formation of the sacral plexus nerves)
The NERVE TO PIRIFORMIS arises from the ventral rami of
S2
(Formation of the sacral plexus nerves)
The POSTERIOR FEMORAL CUTANEOUS NERVE arises from the ventral rami of
S1, S2, and S3
(Formation of the sacral plexus nerves)
The PUDENDAL NERVE arises from the ventral rami of
S2, S3 and S4
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 _________________
1) Lower division
2) largest nerve
3) greater sciatic foramen
4) 2
5) Common epineurium
The axons that courses through the _____________ nerve courses through the sciatic nerve as one single bundle of axons.
Common fibular nerve
the axons that course through the ____________ course through the sciatic nerve as one single bundle of axons
Tibial nerve
In describing the innervation of muscles supplied by the sciatic nerve, one can be more exact by describing an innervation as being from the _______________________________________________
“tibial part of the sciatic nerve” or the “common fibular part of the sciatic nerve”
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?
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
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
a. The lumbar plexus supplies structures on the lateral, anterior, and medial sides of the thigh
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
d. Obturator nerve emerges lateral to the psoas major muscle
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
a. Femoral nerve is the largest branch of the lumbar plexus
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
b. Obturator nerve terminates by dividing into the medial and lateral branches of the obturator nerve
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
b. Sciatic nerve leaves the pelvis through the greater sciatic foramen, above the piriformis muscle
