The Lumbosacral Plexus Flashcards by Sneha Shah

Lumbar plexus consists of

T12-L4

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Sacral plexus consists of

L4-S4

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Coccygeal plexus consists of

S4- Co1

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Subcostal nerve is

T12

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T12 includes cutaneous branches that supply

supply sensory innervation to anterior and lateral body wall and skin over hip

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The cutaneous domain of T12 overlaps with

Iliohypogastic nerve

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T12 innervates

Rectus abdominis

Pyramidalis

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Iliohypogastic nerve is

T12-L1

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Iliohypogastic nerve is closely related to

Ilioinguinal nerve

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Iliohypogastic nerve provides sensory innervation to

Inguinal region and superiormost lateral thigh

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Cutaneous domain of the iliohypogastic nerve overlaps with

Subcostal nerve

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Iliohypogastic nerve innervates

Oblique muscles

Transversus abdominis

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Ilioinguinal nerve is

T12-L1

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Ilioinguinal nerve provides sensory innervation to

superiormost inner thigh, root of penis and upper scrotal skin (male)

mons pubis and labia majora (female)

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Ilioinguinal nerve innervates

Internal oblique muscle

Transversus abdominis muscle

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What are the main four nerves of the lumbosacral plexus

Femoral

Obturator

Tibial

Common fibular

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Genitofemoral nerve consits of

L1-L2

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Femoral branch of genitofemoral nerve exits

Pelvis though lacuna vasorum

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Femoral branch of genitofemoral provides ___ innervation to ___

Sensory innervation ot upper part of femoral triangle

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Genital branch of genitofemoral nerve travels through

Superficial inguinal ring with spermatic cord

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Genital branch of genitofemoral nerve supplies ___ innervation to ___

Sensory innervation to lower scrotal skin

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Genital branch of genitofemoral nerve innervates ___ in males

Innervates cremaster muscle in males

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Genital branch of genitofemoral nerve ends in ___

Mons pubis

Labia majora in females

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Lateral femoral cutaneous nerve consists of

L2-L3

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Lateral femoral cutaneous exits ___ through ___

Exits pelvis at ASIS through the lacuna musculorum

Lateral femoral cutaneous supplies ___ innervation to ___

Sensory innervation to skin of lateral thigh Has NO motor innervation

Obturator consists of

L2-L4

Obturator exits __ through__

Exits pelvis through obturator canal

Obutrator innervates ___

Adductor muscles of the thigh

Femoral nerve consists of

L2-L4

Anterior division of the femoral nerve supplies ___ innervation to ___

Sensory innervation to anterior thigh

Femoral nerve- anterior division innervates

Pectineus Sartorius

Femoral nerve posterior division is also called

Saphenous nerve

Posterior division of femoral nerve (Saphenous nerve) supplies ___ innervation to __

Sensory innervation to anterior leg

Posterior division of femoral nerve (saphenous nerve) innervates

Quadriceps muscle

Superior gluteal nerve consists of

L4-S1

Superior gluteal nerve exits pelvis through

Suprapiniform foramen

Superior gluteal nerve innervates

Gluteus medius Gluetus minimis Tensor fasciae latae

Inferior gluteal nerve consits of

L5-S2

Inferior gluteal nerve exits pelvis through

Infrapiniform foramen

Inferior gluteal nerve innervates

Gluteus maximus

Tibial component of siatic nerve consits of

L4-S3

Tibial component of siatic nerve exits pelvis through

Infrapiriform foramen

Is the tibial component of the siatic nerve sensory, motor, or both?

Both

The common fibular component of siatic nerve is

L4-S2

Common fibular component exits pelvis through

Infrapiriform foramen

Is the common fibular component of the siatic nerve sensory, motor, or both?

Both

Posterior femoral cutaneous nerve consists of

S1-S3

Posterior femoral cutaneous nerve exits pelvis through

Infrapiriform foramen

Posterior femoral cutaneous nerve supply ___ innervation to ___

Sensory innervation to posterior thigh and popliteal fossa

Inferior cluneal branch of the posterior femoral cutaneous nerve supplies

Inferior buttock

Inferior perineal branch of the posterior femoral cutaneous nerve supplies

Perineum

Is the posterior femoral cutaneous nerve motor, sensory, or both?

Neither

Pudendal nerve consists of

S2-S4

How does the pudendal nerve travel?

exits pelvis through infrapiriform foramen Crosses superficial to ischial spine and sacrospinous ligament Enters ischioanal fossa through lesser sciatic foramen

Coccygeal plexus contains

S4-S5

Anococcygeal nerve contains

S4-S5

Coccygeal nerve contains

The ___ divides the greater sciatic foramen into ___ and ___

Piriformis muscle into Suprapiriform foramen and infrapiriform foramen

Generally speaking, structures that pass into the perineum or lower extermity can enter or exit the pelvis by 1 of 4 routes:

Through the pelvic outlet Over the rim of the pelvis Through one of the paired foramina defined by both bone and soft tissue Through the paired sacral foramina

What exits through the pelvic outlet?

Digestive, urinary, and most reproductive organs

What exits over the rim of the pelvis and inguinal ligament?

A few nerves Spermatic cord

What exits through one of the paired foramina?

Arteries Veins Lymphatics Most nerves

What exits through the paired sacral foramina?

Dorsal rami of sacral spinal nerves Lateral sacral artery branches

What nerves exit through the superior rim of the pelvis and inguinal ligament?

Subcostal nerve Iliohypogastic nerve

What nerve exits through the lacuna musculorum?

Lateral femoral cutaneous nerve Femoral nerve

What nerve exits through the lacuna vasorum?

Femoral branch of genitofemoral nerve

What nerve exits through the ilioinguinal canal?

Ilioinguinal nerve Genital branch of genitofemoral nerve

What nerve exits through the obturator canal?

Obturator nerve

What nerve exits through the suprapiriform foramen?

Superior gluteal nerve

What nerves exits through the infrapiriform foramen?

Inferior gluteal nerve Sciatic nerve Posterior femoral cutaneous nerve Pudendal nerve

What nerve enters through the lesser sciatic foramen?

Pudendal nerve (entering perineum)

What big nerves are cranial and part of the lumbar plexus

Femoral nerve (and nerves to the iliacus and psoas) Obturator nerve

What big nerves are part of the sacral plexus?

Common fibular nerve (and gluteal nerves) Tibial nerve (and nerves to lateral rotators

Standing upright rotated the femur ___ through __ degrees and the body axis (and pelvis) ___ through __ degrees

Femur rotates 90 degrees ventrally Body axis/pelvis dorsally through 90 degrees

Combined result of rotation of femur and pelvis is that

Innervation domains come to spiral around the lower extermity

Muscles innervated by the obturator nerve are __ which originate from ___

Adductor muscles Originate from pubis

Muscles innervated by the femoral nerve are ___ and originate from ___

Quads and hip flexor muscles Originate from anterior and medial surfaces of ilium

Muscles innervated by the common fibular and gluteal nerves are ___ which originate from ___

Gluteal muscles Muscles of the anterior and lateral leg Dorsal foot Gluteal muscles originate from posterior and lateral surfaces of ilium

Muscles innervated by the tibial nerve are ___ which originate from ___

Hamstring muscles Most lateral rotator muscles Muscles of posterior leg Plantar foot Hamstring and lateral rotator muscles originate from ischium