PNS Exam 3 Thoracic, Lumbar, Sacral, Coccygeal plexuses = Unit VI notes

what does the nerve to the sartorius supply

sartorius muscle

how many pairs of thoracic nerve roots are there

12

each mixed nerve of the thoracic spinal nerve divides into what

posterior and anterior primary ramus

what projects posteriorward and divides

posterior primary ramus

what does the posterior primary ramus divide into

medial and lateral branch

what function does the medial branches of the posterior primary ramus

motor and sensory

what muscles do the medial branches of the posterior primary ramus supply

-semispinalis

-longissimus

-multifidi

where does the medial branch of the posterior primary ramus supply sensory information

skin paraspinal

what function does the lateral branches of the posterior primary ramus have

motor and sensory

what muscles does the lateral branches of the posterior primary ramus have

-longissimus

-iliocostalis

-levator costarum

where does the lateral branch of the posterior primary ramus supply sensory information

skin near the costal angles

what does the anterior primary rami follow the course of

rib above the nerve

what does the anterior primary ramus of T1 contribute to

brachial plexus

a smaller branch of the anterior primary ramus of T1 forms what

first intercostal nerve

the anterior primary rami of T2 and T1cotnribute to what nerve

intercostobrachial nerve

what does each intercostal nerve give off

lateral cutaneous branch

what does the lateral cutaneous branches given off the intercostal nerve divide into

anterior and posterior branch

what do the lateral cutaneous branches supply

overlying skin

what do the intercostal nerves terminate as

anterior cutaneous branches

what does the anterior cutaneous branches supply

skin close to the midline

what do the intercostal nerves give off when following the course along their adjacent ribs

muscular branches

what do the muscular branches given off the intercostal nerves supply

-internal intercostals

-external intercostals

-innermost intercostals

-serratus posterior

-transversus thoracis

-transverse abdominal

-internal abdominal oblique

-external abdominal oblique

-rectus abdominus

what will the intercostal nerves also supply

adjacent blood vessels, bones, joints, and ligaments

what is the largest of the thoracic nevres

subcostal nerve

what nerve also contributes to the lumbar plexus

subcostal nerve

what does the subcostal nerve supply

skin as far inferior as the superior buttocks

each thoracic nerve communicates with the _____________ by way of both ____________________________________________________

sympathetic trunk by way of both white and gray rami communicans

white rami communicans are what type of fibers

preganglionic sympathetic fibers

gray rami communicans are what type of fibers

post ganglionic sympathetic fibers

how many pairs of lumbar spinal nerves are there

5 pairs

how are the lumbar spinal nerves named

vertebra above the nerve

what does each lumbar nerve root divide into

anterior primary ramus and posterior primary ramus

the posterior primary rami of each lumbar nerve travels posterior and divides into what

medial and lateral branches

the medial branches of the posterior primary rami of the lumbar nerves supplies what

multifidi

the lateral branches of the posterior primary rami of the lumbar nerves supplies what

erector spinae group

the anterior primary rami of lumbar nerves contribute to what

lumbar plexus (1-4) and sacral plexus (4-5)

what are the lumbar spinal nerves communication with

sympathetic trunk

how many lumbar sympathetic ganglia are usually associated with lumbar spinal nerves

four

white rami communicans are associated with what lumbar nerves

L1, L2, and L3 nerve

gray rami communicans associated with what lumbar nerves

every one

what is the lumbar plexus formed by

anterior primary rami of L1-L3 and part of L4

what does the lumbar plexus also receive contribution from

T12 by the way of a communication with the L! nerve

muscular branches from the anterior primary rami of the lumbar plexus supply what

-quadratus lumborum

-psoas major/minor

L1 muscular branches of the anterior primary rami will supply what

quadratus lumborum and psoas minor

L2 muscular branches of the anterior primary rami will supply what

quadratus lumborum and psoas major/minor

L3 and L4 muscular branches of the anterior primary rami will supply what

quadratus lumborum and psoas major

what fibers does the iliohypogastric nerve contain

T12 and L1

what is given off when the iliohypogastric nerve travels through the transverse abdominal muscle and between it and the internal abdominal oblique

lateral cutaneous branch

what does the lateral cutaneous branch of the iliohypogastric nerve supply

posterolateral gluteal region

what does the iliohypogastric nerve continue as once it travels between the transverse abdominal muscle and internal abdominal oblique

anterior cutaneous branch

what does the anterior cutaneous branch of the iliohypogastric nerve supply

skin of the pubic region

what does the iliohypogastric nerve supply

-internal abdominal oblique

-transverse abdominal

what fibers does the ilioinguinal nerve contain

T12 and L1

what does the ilioinguinal nerve leave the inguinal canal through

superficial inguinal ring

what does the ilioinguinal nerve travel with when going through the superficial inguinal ring

spermatic cord

what sensory information does the ilioinguinal nerve supply

-skin of the upper medial thigh

-base of the penis and anterior scrotum

-mons pubis and labium majus

what muscles does the ilioinguinal nerve supply

-internal abdominal oblique

-transverse abdominal

what fibers does the genitofemoral nerve contain

L1 and L2

when the genitofemoral nerve passes anteriorward through the psoas major muscle what does it divide into

genital branch and femoral branch

where does the genital branch enter and travel through

inguinal canal

what does the genital branch of the genitofemoral nerve give motor supply to

cremaster muscles

what does the genital branch of the genitofemoral nerve give sensory supply to

-skin of the superior anterior scrotum

-skin of mons pubis and labium majus

the femoral branch of the genitofemoral nerve passes into __________ to where

thigh posterior to the inguinal ligament

what does the femoral branch of the genitofemoral nerve supply

skin of the upper anterior thigh

what fibers does the lateral cutaneous nerve of the thigh contain

L2 and L3

what does the lateral cutaneous nerve of the thigh supply

skin of the lateral thigh, superior to the knee

the lateral cutaneous nerve of the thigh leaves the abdominal cavity by passing where

under the inguinal ligament

how does the lateral cutaneous nerve of the thigh travel to reach the skin

anterior to the sartorius and through the fascia lata

what fibers does the femoral nerve contain

L2, L3, and L4

where is the femoral nerve formed

posterior to the psoas major and emerges lateral tot eh psoas and anterior to the iliacus

where does the femoral nerve give off branches

only in abdomen and the femoral triangle

where does the femoral nerve branch off too within the abdomen

iliacus and pectineus

once the femoral nerve is past the inguinal ligament what does the nerve divide into

anterior division and posterior division

what does the anterior division of the femoral nerve give rise too

-intermediate cutaneous nerve of the thigh

-medial cutaneous nerve of the thigh

-nerve to the sartorius

what does the intermediate cutaneous nerve of the thigh divide into

2 branches

what does the intermediate cutaneous nerve of the thigh supply

skin on the anterior thigh down to the knee

what does the lateral branch of the intermediate cutaneous nerve of the thigh communicate with

femoral branch of the genitofemoral nerve

some branches of the medial cutaneous nerve of the thigh with help supply what skin

skin of the medial leg through communications with the saphenous nerve

what does the posterior division of the femoral nerve give rise too

muscular branches

what does the muscular branches of the posterior division of the femoral nerve supply

-quadriceps muscles

-vascular branches that supply femoral artery and its branches

-articular branches to knee joint before continuing into the leg as the saphenous nerve

what do muscular branches of the posterior division of the femoral nerve given off in the femoral triangle supply

-sartorius

-rectus femoris

-vastus lateralis

-vastus medialis

-vastus intermedialis

the saphenous nerve is transmitted through what

adducotr canal

what does the saphenous nerve supply

medial leg and foot

what are the clinical considerations of the femoral nerve

-patellar reflex

-sensory deficits

what fibers does the obturator nerve contain

L2, L3, and L4

what is the principle contributor to the obturator nerve

L3

what is the minimal contributor to the obturator nerve

L2

where does the obturator nerve leave the pelvis

obturator foramen

where does the obturator nerve divide

after leaving the obturator foramen

what does the obturator nerve divide into once it leaves the obturator foramen

anterior and posterior branch

what forms the subsartorial plexus

when the anterior branch of the obturator nerve sends branches to communicate with branches of the femoral nerve

what does the subsartorial plexus supply

skin on the medial thigh

what is the termination of the anterior branch of the obturator nerve

supplies the femoral artery

where does the anterior branch of the obturator nerve send articular branches to

hip joint

where does the anterior branch of the obturator nerve send muscular branches

-adductor longus

-gracilis

-pectineus

-adductor brevis

the anterior branch of the obturator nerve may send fibers to connect with what if present

accessory obturator nerve

when the anterior branch of the obturator nerve sends fibers to communicate with medial cutaneous nerve of the thigh and the saphenous nerve what may it help supply

skin on the upper medial side of the leg

where does the posterior branch of the obturator nerve travel

through obturator externus, posterior to adductor brevis, and anterior to the adductor magnus

where does the posterior branch of the obturator nerve send muscular branches too

-obturator externus

-adductor magnus

-adductor brevis

what are the clinical consideration of the obturator nerve

-muscular weakness

-sensory deficits