Lumbosacral Plexus Flashcards

1
Q

Which anterior rami make up the lumbosacral plexus?

A

L1 - L5; S1 - S4

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2
Q

Which spinal nerves make up the lumbar plexus?

A

Anterior rami of spinal nerves L1 - L4

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3
Q

Which muscles does the lumbar plexus innervate?

A

Muscles of anterior and medial thigh

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4
Q

What contributes to the sacral plexus?

A

Anterior rami of spinal nerves L4 - L5 and S1 - S4

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5
Q

Which muscles does the sacral plexus innervate?

A

Muscles of the gluteal region

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6
Q

Which plexus does the sciatic nerve originate from?

A

Sacral plexus

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7
Q

Which regions does the sciatic nerve innervate?

A

Posterior thigh, leg, foot

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8
Q

Which nerves exit through the greater sciatic foramen? Which regions do they innervate?

A

Gluteal nerves - Gluteal region

Sciatic nerve - Posterior thigh, leg, foot

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9
Q

Which nerve exits deep to the inguinal ligament? What region does it innervate?

A

Femoral nerve - Anterior thigh

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10
Q

Which nerve exits through the obturator foramen? Which region does it innervate?

A

Obturator nerve - Medial thigh

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11
Q

Which nerves arise from the lumbar plexus?

A
Iliohypogastric nerve
Ilioinguinal nerve
Genitofemoral nerve
Lateral cutaneous nerve of thigh
Femoral nerve
Obturator nerve
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12
Q

Which anterior ramus contributes to the iliohypogastric nerve?

A

L1

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13
Q

Which anterior ramus contributes to the ilioinguinal nerve?

A

L1

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14
Q

Which anterior rami contribute to the genitofemoral nerve?

A

L1 - L2

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15
Q

Which anterior rami contribute to the lateral cutaneous nerve of the thigh?

A

L2 - L3

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16
Q

Which anterior rami contribute to the femoral nerve?

17
Q

Which anterior rami contribute to the obturator nerve?

18
Q

What is the lumbosacral trunk? Where does it travel?

A

Anterior rami of L4 - L5 that forms sacral plexus with S1 - S4 anterior rami

Descends into pelvis

19
Q

What does the iliohypogastric nerve innervate?

A

Abdominal muscles
Skin overlying iliac crest
Hypogastric region

20
Q

Which muscle is a landmark for finding both the iliohypogastric and ilioinguinal nerves?

A

Quadratus lumborum

21
Q

Which regions does the ilioinguinal nerve innervate?

A

Abdominal muscles
Skin of genital region
Skin of medial thigh region

22
Q

Where does the ilioinguinal nerve typically lie in relation to the iliohypogastric nerve?

A

Inferiorly

23
Q

Where do the iliohypogastric and ilioinguinal nerves exit?

A

They disappear into the muscles of the anterolateral abdominal wall

24
Q

Where is the genitofemoral nerve found?

A

It appears on anterior aspect of psoas major

25
What does the femoral branch of the genitofemoral nerve innervate?
Skin on anterior surface of thigh
26
What does the genital branch of the genitofemoral nerve innervate?
Cremaster muscle | Skin of genitals
27
Where does the genital branch of the genitofemoral nerve lie in relation to the femoral branch?
Medially
28
What does the lateral cutaneous nerve of thigh innervate?
Skin on anterolateral surface of thigh
29
Over which muscle does the lateral cutaneous nerve of thigh travel?
Iliacus
30
Where does the lateral cutaneous nerve of thigh exit the pelvis?
Medial to the ASIS, deep to the inguinal ligament
31
What does the femoral nerve innervate?
Iliacus | Anterior thigh
32
Where is the femoral nerve found?
Lateral to psoas major
33
What does the obturator nerve innervate?
Medial thigh
34
Where does the femoral nerve exit the pelvis?
Deep to inguinal ligament
35
Where does the obturator nerve exit the pelvis?
Obturator foramen
36
Where is the obturator nerve found?
Medial to psoas major