Unit 2: Lecture 18 (Lumbosacral Plexus) Flashcards Preview

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Flashcards in Unit 2: Lecture 18 (Lumbosacral Plexus) Deck (21):
1

Muscles lining the posterior abdominal wall

psoas major
iliacus
quadratus lumborum
psoas minor (40% of ppl)

2

endoabdominal/transversalis fascia

connective tissue lining the muscles of the posterior abdominal wall and the entire internal surface of that wall
-continuous with endopelvic fascia
-invested with fat (preperitoneal fat)

3

What APR form lumbar plexus

L1-L4, T12 (50% of time)

4

Gray rami communicantes (sympathetic postganglionics) from the sympathetic trunk enter which roots?

T12-L4

5

Which roots send White rami communicantes (sympathetic preganglionics) to the sympathetic trunk

T12-L2

6

Within what muscle does the lumbar plexus form?

Psoas major
-emerges from lateral, anterior, and medial borders

7

Nerves of Lumbar Plexus

subcostal nerve (T12)
iliohypogastric (L1)
ilioinguinal (L1)
genitofemoral (L1-L2)
lateral femoral cutaneous (L2-L3)
femoral (L2-L4)
obturator (L2-L4)
accessory obturator (L3-L4) (9% of ppl)

8

divisions of lumbar plexus

anterior and posterior

9

posterior division of lumbar plexus includes what nerves

lateral femoral cutaneous n
femoral n

10

anterior division of lumbar plexus

obturator n and accessory n's

11

What VPR make up sacral plexus

L4-S3, and part of S4, all nerves derived from Ant or Post Divisions/Branches

12

Sacral plexus lies anterior to the _________ muscle, on the _______ ________ wall.

piriformis muscle
posterior pelvic wall

13

Divisions/Branches of sacral plexus

anterior and posterior

14

Branches from the sacral plexus pass to lower limb through the _______ ________ ________

greater sciatic foramen

15

Nerves/branches of sacral plexus

Superior gluteal n (L4, L5, S1)
Inferior gluteal n (L5, S1, S2)
sciatic n (L4-S3)
Nerve to quadratus femoris muscle and gemellus inferior (L4-S1)
Nerve to obturator internus and gemellus superior (L5-S2)
Posterior cutaneous n's to thigh (S2,S3)
pudendal n (S2-S4)
Nerve to piriformis (S1-S2)
pelvic splanchnic nerves (S2-S4)

16

Anterior division of sacral plexus includes what nerves

**Tibial N (L4-L5, S1-S3)
**Posterior Femoral Cutaneous (S2-S3)
**Pudendal n (S2-S4)
N to quadratus femoris and gemellus inferior
N to obturator internus and gemellus superior
Pelvic Splanchnic n
Perineal branch of 4th sacral n
Nerve to levator ani.

17

Posterior division of sacral plexus includes what nerves

**Common peroneal n (L4-L5, S1-S2)
**posterior femoral cutaneous n (S1-S2)
superior gluteal n
inferior gluteal n
N to piriformis
Perforating cutaneous n

18

Landmarks of the posterior abdominal wall

Two, 12th ribs
Lumbar spine
Ilium and Iliac crest
Iliacus
Psoas major

19

Deep to transversalis fascia

-preperitoneal fat
-peritoneal lining- lines the abdomen and supports abdominal viscers

20

What connects L4-L5 VPR to S1 VPR

Lumbosacral trunk

21

Sciatic nerve made up of which 2 nerves

common fibular/peroneal and tibial n's, which split when approaching popliteal fossa