Anatomy 2 - nerves of lumbosacral plexus Flashcards Preview

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Flashcards in Anatomy 2 - nerves of lumbosacral plexus Deck (21):
1

Ilioinguinal nerve

C: L1, lateral border inferior to iliohypogastric, obliquely crosses QL and iliacus, perforates transverse abdominis near anterior iliac crest and communicates with iliohypogastric
M: inferior TA and IO
S: medial femoral triangle

2

Iliohypogastric

C: T12, L1, descends anteriorly to QL, runs past iliac crest posterior to kidnyes. Pierces TA and divides into lateral and anterior cutaneous branches
M: inferior TA and IO
S: supero-lateral quadrant of buttocks

3

Genitofemoral

C: L1, L2, pierces psoas anteriorly before travelling to the inguinal ring and passing through the inguinal canal
M: cremaster in males
S: lateral femoral triangle

4

Lateral femoral cutaneous

C: L2, L3, deep through inguinal ligament and runs towards ASIS
M: nil
S: anterior and lateral thigh

5

Femoral

C: L2, L3, L4 (dorsal), descends from psoas, emerging laterally. Passes under inguinal ligament to enter the femoral triangle
M: iliopsoas, pectineus, sartorius, rectus femoris, vastus lateralis, vastus medalis, vastus intermedius
S: anterior and medial thigh

6

Saphenous

C: L2, L3, L3 (femoral), travels down thigh behind sartorius and enters adductor canal
M: nil
S: medial leg and foot

7

Accessory obturator

C: L3, L4

8

Obturator

C: L2, L3, L4 (ventral), medial to psoas major, passes through obturator foramen to the medial thigh region
M: adductor longus, adductor magnus, adductor brevis, gracilis, obturator externus, pectineus
S: middle 1/3 medial thigh

9

Sciatic

C: L4, L5, S1, S2, S3, enters the thigh via greater sciatic foramen, emerges under piriformis superiorly, lies deep to glute max, descends via greater trochanter and ischial tuberosity, passes over small lateral rotators (SG, OI, IG, QF, OE), crossed by biceps femoris and behind adductor magnus, divides into tibial and common fibular near apex of popliteal fossa
M: branches into tibial and common fibular nerves
S: nil

10

Tibial

C: L4, L5, S1, S2, S3, descends along the posterior thigh and popliteal fossa, passes anteriorly to the arch of soleus with the popliteal artery and descends into the leg before terminating beneath the flexor retinaculum
M: gastroc, soleus, popliteal, TP, FHL, FDL
S: sural, medial calcaneal, lateral plantar, medial plantar

11

Medial calcaneal

Branch of tibial nerve
S: posterior aspect of foot near calcaneus

12

Sural

Branch of tibial nerve
S: anterior and lateral lower leg, dorsum of foot

13

Medial plantar

Branch of tibial nerve
M: AbdH, FDB, FHL (medial head), 1st and 2nd lumbricals
S: medial aspect of plantar surface of foot

14

Lateral plantar

Branch of tibial nerve
M: QP, AddH, AbdHMB, ODM, 3rd and 4th lumbricals, plantar and dorsal interossei
S: lateral aspect of plantar surface of foot

15

Common fibular

C: L4, L5, S1, S2, obliquely descends along lateral popliteal fossa to fibular head, medial to biceps femoris before curbing laterally to the fibular neck deep to fibularlis longus. It then divides into superficial and deep fibular nerves
M: deep and superficial fibular nerves
S: lateral calf

16

Superficial fibular

Branch of common fibular
M: FL, FB
S: cutaneous branch of superficial fibular

17

Deep fibular

Branch of common fibular
M: TA, EHL, EDL, FT
S: cutaneous branch of deep fibular

18

Superior gluteal

C: L5, S1, S2, leaves pelvis through greater sciatic foramen, superior to piriformis
M: gluteus medius, gluteus minimis, TFL
S: nil

19

Inferior gluteal

C: L5, S1, S2, greater sciatic foramen inferior to piriformis and superficial to sciatic nerve
M: gluteus maximus
S: nil

20

Posterior femoral cutaneous

C: S1, S2, S3, passes through greater sciatic foramen deep to gluteus maximus then descends deep to TFL
M: nil
S: posterior thigh and popliteal fossa

21

Pudendal

C: S2, S3, S4
M: pelvic floor muscles
S: genital region