Lumbosacral Plexus

Health Professions 8008 with Renegar at East Carolina University

About this deck

By: Robyn Zalph
Created: 2011-06-17
Size: 26 flashcards
Views: 18

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Anterior and Posterior split occurs where?

At L2 rami split into anterior and posterior divisions

How many segments does the lumbosacral plexus involve?

ventral rami of spinal nerves L1-S4

What does the lumbar plexus supply innervation to?

Muscles and skin of the anterior and medial thigh and skin of medial leg and foot.

What do anterior fibers correlate with?

anterior goes with pre axial
*L1 is anterior division nerve

Iliohypogastric nerve

arises from L1 (sometimes T12) passes inferiorly and laterally across quadratus lumborum (extends and laterally flexes vertebral column) then the nerve innervates abdominal musculature and supplies skin of suprapubic region and upper gluteal

Ilioinguinal nerve

arises from L1. Also supplies abdominal muscles. It transverses inguinal canal and emerges through superficial inguinal ring. Cutaneous branches to upper medial thigh and anterior scrotum or labia majus.

Genitofemoral nerve

L1, L2 emerges on anterior surface of psoas major and divides into genital and femoral branches. Genital branch goes to cremaster muscle and cutaneous areas of scrotum/ labia major and adjacent thigh. Femoral branch goes to skin over femoral triangle.

obturator nerve L2, L3, L4

emerges from medial border of psoas, passes through obturator canal and dividies into anterior and posterior (at adductor brevis muscle). Anterior branch goes to add long, brev and gracilis and sensory at hip. Posterior does obturator ex., add mag

What do posterior fibers correlate with?

posterior goes with post axial which involves muscles attaching to

Lateral femoral cutaneous

L2, L3

passes inferolaterally across iliacus muscle toward ASIS and enters thigh inferior to inguinal lig.

Supplies skin over lateral thigh and buttock

posterior division

Femoral Nerve

L2,L3,L4
largest branch of lumbar plexus; posterior division

Supplies iliacus and psoas major muscles then enters anterior thigh in femoral triangle. Innervates anterior thigh muscles. intermediate and medial femoral cutaneous n supply skin.

saphenous nerve

accompanies femoral vessels in the adductor canal and supplies skin on anterior and medial knee, leg and foot

posterior division

Lumbosacral trunk

joining of the remaining fibers of L4 and L5 NOT consibered part of lumbar plexus

meerges from medial border of psoas major to join sacral plexus

sacral plexus

involves ventral rami of L4, L5 (lumbosacral trunk) and S1-4

this plexus is on the posterior pelvic wall, anteiror to the piriformis and deep to the pelvic fasica and perineum

supplies muscles and skin of gluteal region, post thigh, leg, and foot

sciatic nerve

L4, L5, S1, S2, S3 a and p divisions.

Largest nerve composed of tibial and common fibular which split at popliteal fossa

doesn't actually supply anything

Tibial Nerve

L4, L5, S1, S2, S3 supplies articular branch to hip and knee. Supplies posterior thigh, posterior leg and sole of foot

anterior division

Nerve to quadratus femoris and inferior gemmellus

L4, L5, S1
passes through greater sciatic foramen and gives articular branch to hip joint. supplies muscles in name

anterior division

Nerve to obturator internus and superior gemmellus

L5. S1, S2

passes through the greater sciatic foramen and supplies muscles in name

anterior division

posterior femoral cutaneous nerve

formed from anterior S2 and S3 and posterior S1 and S2

passes through the sciatic foramen w/ sciatic nerve and supplies inferior buttock, posterior scrotum/ labia majus and posterior thigh and knee

WILL BE TAGGED ON OUR BODY PROBABLY**

Pudendal nerve

S2, S3, S4
passes through greater sciatic foramen, crosses sacrospinous ligament and reenters pelvis through lesser sciatic foramen

innervates external anal sphincter and urogenital triangle muscles and skin there

anterior division

nerve to levator ani and coccygeus

S3 S4 supplies these muscles

anterior division

Common fibular/ peroneal nerve

L4-5, S1-2
posterior division

Supplies short head of biceps femoris and articular branches to knee

passes over head of fibula, divides into superficial (lateral leg musc, skin on dorsum of foot) and deep (anterior leg musc and skin, dorsum of foot musc)

Superior gluteal nerve

L4, L5, S1
posterior division
passes through greater sciatic foramen SUPERIOR to piriformis and supplies glut med, min, and TFL

articular branch to hip joint

Inferior Gluteal Nerve

L5, S1, S2
posterior division
pass through greater sciatic foramen superior to piriformis and supplies glut max

Nerve to Piriformis

S1, S2
Passes through greater sciatic foramen to supply piriformis

Coccygeal plexus

ventral ramus of 5th sacral nerve and coccygeal nerve form this small plexus NOT PART OF SACRAL PLEXUS

forms anococcygeal nerve and supplies small area of skin over coccyx

About this deck

By: Robyn Zalph
Created: 2011-06-17
Size: 26 flashcards
Views: 18

About StudyBlue

“I have been getting MUCH better grades on all my tests for school. Flash cards, notes, and quizzes are great on here. Thanks!”
Kathy