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Neurology - Spinal Nerves Map (dropped image link (*LumboSacral Plexus …
Neurology - Spinal Nerves Map
*Home
*DIRTY USMLE
UPPER EXTREMITY NERVES
Cervical Plexus
C1 -C8
*Cervical Plexus
C1 -C8
*Brachial Plexus
C5 - T1
Posterior Chord
*Radial nerve
MOTOR
ALL extensors of ENTIRE posterior arm
triceps
all posterior forearm extensors
SENSATION
back of the arm
back of the hand for 1st 3 1/2 digits
--> behind the median front coverage
Radial nerve "wrist drop" vs "finger drop"
Radial nerve
"wrist drop"
= radial groove fracture
--> higher up so wrist affected
Radial nerve
"finger drop / Saturday night palsy/screwdriver palsy"
= supinator canal nerve compression
--> lower down so only the fingers are affected
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*Radial nerve sensation
SENSATION
back of the arm
back of the hand for 1st 3 1/2 digits
--> behind the median front coverage
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*Axillary nerve
MOTOR
deltoid muscle
SENSATION
?
Axillary nerve sensation
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Axillary nerve Motor
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Lateral Chord
.
Lateral Pectoral Nerve
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Medial Chord
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Medial Pectoral Nerve
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Brachial Plexus --> think of REAL truckers and their J BRAKES (= brachial plexus)
"REAL Truckers Drink COLD BEER" (at rest stops)
roots, trunks, divisions, cords, branches
"REAL Truckers TIP HIGH and play the LOWERING CLAW GAME at rest stops"
Upper trunk lesion = "waiter's tip / ERBs palsy"
--> behind back (arm extended / internally rotated / pronated)
Lower trunk lesion = CLAW hand
*Phrenic Nerve
comes from C3,c4,c5
*Reflexes of the Cervical Roots
C1 - C8
Thoracic Plexus
T1 - T12
*Thoracic Plexus
T1 - T12
*LumboSacral Plexus
contain both the sacral and lumbar plexeses
Lumbosacral Radiculopathy = Nerve Compressions
SCIATICA = nonspecific term for compression of the lumbosacral nerve roots
usually below L2
--> L5 and S1 are most common\
L5 =
"foot drop and big toe drop"
--> deep peroneal = big toe + deep in the cracks sensation
--> superficial peroneal = dorsiflexion
S1 = achillies reflex
-->
"1 2 BUCKLE my SHOE"
L1 =
Inguinal
--> NOT involved in sciatia
L2 = front thigh
L3 = outer thigh
L4 = knee
-->
"on all 4s"
= knee reflex
L5 =
"foot drop and big toe drop"
--> deep peroneal = big toe + deep in the cracks sensation
--> superficial peroneal = dorsiflexion
S1 = achillies reflex
-->
"1 2 BUCKLE my SHOE"
*Sciatica
SCIATICA = nonspecific term for compression of the lumbosacral nerve roots
*straight leg raise test for spinal radiculopathy
tries to pinch the nerve to recreate the pain
Sacral Plexus
S1 - S5
*Sacral Plexus
S1 - S5
*Pudendal Nerve
from S2,s3,s4
pudendal nerve responsible for the "anal wink" reflex
-->
"s3,s4 = Winks Galore"
Pudendal Nerve Injury after pregnancy
from stretching of the pelvis can cause damage
*Sciatic Nerve
from the sacral plexus
gives off the 2 major nerve branches that reach the foot
--> tibial and peroneal = fibular nerves
Tibial nerve
--> posterior calf muscles = 2x gastrocnemius, pantaris, soleus
--> plantar flexion
common peroneal = fibular nerve
--> superficial peroneal = eversion + most sensation
--> deep peroneal nerve = dorsiflexion + INVERSION
*common peroneal = fibular nerve
splits into Deep and superficial branches of peroneal nerve
note the peroneal = fibular nerve wraps around the top head of the fibula
--> common compression site or tear from fractures of fibula
superficial fibular branch = gives sensation to the dorsum of the foot
deep fibular branch = gives mottor innervation to anterior muscle of leg that cause dorsi flexion of the foot
--> get foot drop when injured
*Superficial peroneal nerve
MOTOR
innervation:
3 major foot INVERSION muscles = fibularus BLT
--> anterior tibialis
--> fibularis longus
--> fibularis tertius
SENSATION
innervation:
MOST sensation to the dorsum of the foot
--> just NOT DEEP and around the big toe = Deep peroneal nerve
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*Deep peroneal nerve
deep fibular branch = gives mottor innervation to anterior muscle of leg that cause dorsi flexion of the foot
--> get foot drop when injured
MOTOR
innervation:
1 + 3
1 major dorsiflexor
--> anterior tibialis
4 LBs extensors of digits
--> extensor digitorum longus
--> extensor digitorum brevis
--> extensor hallicus longus
--> extensor hallicus brevis
SENSATION
innervation:
ONLY sensation the small space between the hallicus and 2nd digit
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*tibial nerve
goves off the cutaneous sural nerve branch
divides into posterior tibial nerve
*tibial nerve
tibial nerve injury
--> can't do the tippy toe PLANTAR FLEXION
MOTOR
innervation:
ALL major plantarflexion muscles in leg + foot INVERSION (along with deep peroneal nerve)
--> anterior tibialis
--> fibularis longus
--> fibularis tertius
also innervates the flexor hallicus longus
SENSATION
innervation:
ONLY plantar!!
--> rest is fibular = deep + superficial
*tibial nerve MOTOR
innervation:
ALL major plantarflexion muscles in leg + foot INVERSION (along with deep peroneal nerve)
--> anterior tibialis
--> fibularis longus
--> fibularis tertius
also innervates the flexor hallicus longus
SENSATION
innervation:
plantar region of the foot
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*Pelvic autonomic nerves
note the prostatic plexus and cavernous nerves to the penis for Point and Shoot erection go together
so radical prostatecomy has a risk of erectile dysfunction since you may take the parasympathetic cavernous nerves to the CORPUS CAVERNOSUM
Lumbar Plexus
L1 - L5
*Lumbar Plexus
L1 - L5
*Obtuator Nerve
origin
= L2, L3, L4
Motor innervation
= obtuator muscle
-->
Motor innervation
= adductor muscles
--> after obtuator canal divides into anterior and posterior branches to supply the 3 adductor muscles
--> adductor brevis, longis, magnus
Anatomy Course
= posteromedial to IlleoPsoas muscle in pelvis
--> exits the pelvis through
Dermatomes
= just above the knee on inner thigh
*Obtuator Foreman and Canal
OF is the big foreman in the anterior o the pubic tubercle
Obtuator membrane covers most of it
--> has a tiny hole in the obtuator membrane where the obtuator nerve anterior and posterior branches exit the pelvis
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*Abdominal Nerves
suprapubic areas sensation = illeohypogastric nerve
*Pubic and Supra Pubic Innervation
Pubic sensation = illeoinguinal
Suprapubic sensation = illeohypogastric
--> note the HYPOGASTRIC GI area
--> named after the ILLEO HYPOGASTRIC nerve that supplies innervation there
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*Femoral Nerve
femoral nerve part of the lumbar plexus
think it is in front and above the sciatic nerve branches = tibial and fibular
*Lateral Cutaneous Femoral Nerve = LCFN
comes from L2L3
NO motor
Sensory ONLY to the lateral thigh
*Notes - Spinal Nerves
all Cervical spinal nerves exit above the vertebrae
C8 is the dividing spinal nerve
there are ONLY 7 C vertebrae
--> C8 is below vertebra 7
all spinal nerves starting at T1 and below exit below the vertebrae
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