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Lumbosacral Plexus (part 2 of 2)
Rinaldi 2/9/11 lecture
52
Anatomy
Undergraduate 4
02/10/2011

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Term
ventral rami of L1-S3
Definition
what rami create the lumbosacral plexus
Term
bundle of fibers from L4 and L5 called the lumbosacral trunk
Definition
how are the lumbar plexus and sacral plexus joined?
Term
each ventral rami has and anterior and posterior divison
Definition
what are the divisions of the lumbosacral trunk, and where are they?
Term
ventral musc= posterior/medial compartments
Definition
developmentally the ventral muscle groups come to lie in the ____ and ___ compartments in the leg
Term
dorsal musc = anterior and lateral comparments
Definition
developmentally the dorsal muscle groups come to lie in the ____ and ___ compartments in the leg
Term
subcostal Nerve
Definition
T12 ventral rami forms this
Term
rib 12
Definition
what rib forms the upper border of the lumbosacral plexus?
Term
ileohypogastric and ileoinguinal
Definition
what nerves come out of L1?
Term
ileohypogastric nerve (L1)
Definition
this innervates the skin below the iliac crest and transversus abdominus and internal oblique
Term
ileoinguinal nerve (L1)
Definition
innervates the skin of the inner thigh, scrotum in males, and labia majorum in females

motor: transversus abdominus and internal oblique
Term
subcostal nerve
Definition
innervates lowest part of external oblique and skin over the anterior superior iliac spine
Term
psoas major
Definition
the lumbosacral plexus comes out through what muscle?
Term
genitofemoral nerve
Definition
this nerve only innervates muscle in males (cremaster muscle) BUT does the SKIN of the
- anterior upper thigh and scrotum of males
- mons pubis and anterior labium majorus in females
Term
genitofemoral ligament
Definition
this nerve forms form L1 and L2
Term
lateral cutaneous nerve to thigh (L2 and L3?)
Definition
pregnancy, low riding tight jeans, or a weight belt can trap/compress this nerve and stretch it causing parasthesia on the lateral thigh
Term
lateral cutaneous nerve to thigh
Definition
this nerve comes from L2 and L3
Term
inguinal ligament
Definition
divides the trunk and lower limb
Term
inguinal ligament
Definition
vessels of the lower limb come out below this structure but the spermatic cord comes out above it
Term
Obturator N.
Definition
anterior divison of L2,L3,L4
Term
Femoral Nerve
Definition
posterior divisions of L4 & L5
Term
superior gluteal n.
innervates gluteas medius and minimus + tensor fascia latae (no sensory)
Definition
the nerve formed from the L4, L5, S1 posterior divison innervates what?
Term
inferior gluteal nerve
-gluteas maximus (no sensory)
Definition
the nerve formed from L5, S1, S2 posterior divisions innervates what?
Term
Sciatic nerve
Definition
formed from anterior and posterior divisions of S1, S2, S3, also fibers from L4 & L5

-usually splits in distal thigh, but with an anomaly splits in glutes
Term
tibial and common peroneal
Definition
what do the divisions of the sciatic nerve split into?
Term
tibial nerve/division
Definition
all anterior(ventral) division fibers of the sciatic nerve (L4-S3) become this
Term
common peroneal division (common fibular division)
Definition
dorsal/posterior division fiber component of the sciatic nerve(L4-S2) becomes this
Term
motor: hamstrings, posterior leg, intrinsic foot muscles

sensory: sole of foot
Definition
motor and sensory innervation of the tibial division/nerve
Term
motor: short head of biceps femoris (1/2 thigh muscle) + lateral and anterior compartements of leg

sensory: lateral leg and dorsum of foot
Definition
motor/sensory innervation of common peroneal/fibular division
Term
genital branch of genitofemoral nerve
Definition
this nerve follows the spermatic cord to innervate cremaster muscle
Term
psoas major
Definition
iliohypogastic nerve comes through what muscle
Term
iliac crest
Definition
ilioinguinal nerve comes up over what structure?
Term
genitofemoral nerve
Definition
L1 + L2 fibers, pierces then runs anterior to psoas major
Term
lateral femoral cutaneous nerve
Definition
L2 and L3 fibers, passes in small gap below inguinal ligament
Term
inguinal ligament
Definition
runs from anterior superior iliac spine to pubic bone
Term
inguinal ligament
Definition
forms from inferior edge of external abdominal oblique
Term
it comes out just deep to the ligament where the ligament attaches to the illium (susceptible to pinching in pregnancy/weightbelt/jeans)
Definition
where does the lateral femoral cutaneous n to thigh travel in relation to the inguinal ligament?
Term
obturator nerve
Definition
has little sensory(upper medial thigh), mostly motor to the medial compartment of the thigh (adductors of hip and thigh)
Term
the obturator artery and vein (supplies same area as nerve)
Definition
what is the obturator nerve bundled with as it passes through the obturator foramen
Term
femoral nerve
Definition
passes lateral to psoas major, deep to the inguinal ligament then enters thigh and breaks into motor and sensory branches

motor: anterior compartment of thigh
sensory: anterior thigh and medial leg (LARGE sensory area)
Term
thigh
Definition
hip to knee
Term
leg
Definition
knee to ankle
Term
posterior cutaneous nerve to thigh (S1,S2, S3)
Definition
innervates the largest area of skin for a cutaneous nerve on the whole body
Term
below inguinal ligament (at t12 level)
Definition
L1 dermatome test location
Term
mid way down anterior thigh
Definition
L2 dermatome test location
Term
medial side of the knee
Definition
L3 dermatome test location
Term
medial side of the ankle
Definition
L4 dermatome test location
Term
third metatarsal
Definition
L5 dermatome test location
Term
lateral side of foot
Definition
S1 dermatome test location
Term
popliteal fossa
Definition
S2 dermatome test location
Term
ischial tuberosity
Definition
S3 dermatome test location
Term
perianal skin (coencentric)
Definition
S4,S5 dermatome test location
Term
hip flexion: L2,L3
hip extension: L4, L5 (+ S1)

knee extension: L3,L4
knee flexion: L5, S1

Ankle dorsiflexion: L4,L5
Ankle plantar flexion: S1,S2
Definition
myotomes: draw the circles
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