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Anatomy - Ester > Lumbar and Sacral Plexuses > Flashcards

Lumbar and Sacral Plexuses Flashcards

1
Q

What spinal nerves contribute to the lumbar plexus

A

Ventral Rami of L1-L4

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2
Q

Which spinal nerves contribute to the sacral plexus

A

Ventral Rami of L4-S4

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3
Q

Which six named nerves form from the lumbar plexus?

Interested, In, Getting, Laid, On, Friday

A

Iliohypogastric, Ilioinguinal, genitofemoral, lateral cutaneous nerve of the thigh, obturator, femoral

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4
Q

Which nerve roots contribute to the iliohypogastric nerve?

A

L1 and contributions from T12

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5
Q

What does the iliohypogastric nerve innervate?

A

Motor: Internal oblique and transversus abdominis
Sensory: posterolateral skin in gluteal region

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6
Q

Which nerve roots contribute to the ilioinguinal nerve?

A

L1

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7
Q

What does the ilioinguinal nerve innervate?

A

Motor: Internal oblique and transversus abdominis
Sensory: Upper middle thigh
Men- anterior scrotum and root of penis
Women - skin over labia majora and mons pubis

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8
Q

Which nerve roots contribute to the genitofemoral nerve?

A

L1 and L2

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9
Q

What does the genitofemoral nerve innervate?

A

Genital branch: Cremasteric muscle (motor)
Men- anterior scrotum and root of penis
Women - skin over labia majora and mons pubis
Femoral branch: Skin on upper anterior thigh

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10
Q

Which nerve roots contribute to the lateral cutaneous nerve of the thigh?

A

L2 and L3

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11
Q

What does the lateral cutaneous nerve of the thigh innervate?

A

Sensory: Anterior and lateral thigh down to the knee

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12
Q

What is the clinical relevance of the lateral cutaneous nerve of the thigh?

A

Can become compressed by wearing tight clothing, loose sensation to the area it supplies.

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13
Q

Which nerve roots contribute to the Obturator nerve?

A

L2, L3,L4

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14
Q

What does the obturator nerve innervate?

A

Motor: Medial compartment of the thigh
Sensory: Skin on medial thigh

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15
Q

Which nerve roots contribute to the femoral nerve?

A

L2,L3,L4

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16
Q

Describe the anatomical course of the femoral nerve

A

Decends in the lumbar plexus, passes through psoas major, runs behind the inguinal ligament into the thigh and passes in the femoral sheath with the vein and artery through the femoral triangle.

17
Q

What does the femoral nerve innervate?

A

Motor: Anterior compartment of the thigh, plus illiacus and pectineus
Sensory: Skin on anterior thigh and medial leg.

18
Q

What are the major named branches of the Sacral plexus? (5 of them)

Some, Irritating, Sailors, Pestered, Polly

A 
Superior gluteal
Inferior gluteal
Sciatic
Posterior femoral cutaneous
Pudendal
19
Q

Which nerve roots conrtibute to the superior gluteal nerve?

A

L4, L5, S1

20
Q

Through which foramen do all the named nerves of the sacral plexus leave the pelvis?

A

Greater Sciatic Foramen

21
Q

What does the superior gluteal nerve innervate?

A

Motor: Gluteus medius and minimus and tensor fascia lata (TFL)

22
Q

Which nerve roots conrtibute to the inferior gluteal nerve?

A

L5, S1, S2

23
Q

What does the inferior gluteal nerve innervate?

A

Motor: Gluteus maximus

24
Q

Which nerve roots contribute to the sciatic nerve?

A

L4,L5,S1,S2,S3

25
Q

Which two nerves does the sciatic nerve form?

A

Tibial nerve and Common fibular nerve

26
Q

What does the tibial nerve innervate?

A

Motor: Posterior thigh apart from short head of biceps femoris, Posterior leg and Sole of the foot
Sensory: Skin on posterolateral and medial food plus sole of foot.

27
Q

What does the common fibula nerve innervate?

A

Motor: Muscles of anterior and lateral leg plus short head of biceps femoris.
Sensory: Skin on anterolateral portion of the leg plus dorsum of the foot.

28
Q

Which nerves contribute to the posterior femoral cutaneous nerve?

A

S1, S2, S3

29
Q

What does the posterior femoral cutaneous nerve innervate?

A

Innervates the skin on the posterior surface of the thigh and leg. Also innervates the skin of the perineum.

30
Q

Which nerves contribute to the pudendal nerve?

A

S2, S3, S4

31
Q

Describe the course of the pudendal nerve

A

Leaves the pelvis via the greater sciatic foramen, re-enters via the lesser sciatic foramen.

32
Q

What are the motor functions of the pudendal nerve?

A

Skeletal muscles of the perineum, levator ani, external urethral and anal sphincters

33
Q

What are the sensory functions of the pudendal nerve?

A

Innervates the penis, clitoris and most of the skin of the perineum.

Anatomy - Ester (3 decks)

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