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Gross Anatomy II NYCC > Posterior Abdominal Wall > Flashcards

Posterior Abdominal Wall Flashcards

1
Q

Name the bony elements of the posterior abdominal wall

A
  • Lumbar vertebrae
  • Wing of the ilium
  • Sacrum
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2
Q

Name the muscles of the posterior abdominal wall

A
  • quadratus lumborum
  • psoas major
  • psoas minor
  • iliacus
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3
Q

Name the 7 nerves of the lumbar plexus

A
  • subcostal
  • iliohypogastric
  • ilioinguinal
  • genitofemoral
  • obturator
  • lateral femoral cutaneous
  • femoral
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4
Q

Most nerves of the posterior abdominal wall pass through ____

A

Psoas major

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5
Q

What nerve supplies the skin in the suprapubic region?

A

iliohypogastric (L1)

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6
Q

The lumbar plexus is composed of what spinal levels?

A

T12-L4

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7
Q

What nerve supplies skin along the proximomedial thigh, root of penis, upper scrotum (Mona pubis) and labia majora?

A

ilioinguinal (L1)

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8
Q

What nerve supplies cremaster and scrotal skin?

A

Genital branch of genitofemoral n

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9
Q

What nerve supplies skin over the femoral triangle?

A

Femoral branch of genitofemoral n

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10
Q

What nerve supplies skin over the anterior gluteal region and greater trochanter?

A

Subcostal n (T12)

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11
Q

What nerve supplies skin over the lateral thigh?

A

Lateral femoral cutaneous n (L2-L3)

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12
Q

What nerve supplies skin medially above the knee?

A

Obturator (L2-L4)

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13
Q

The obturator nerve emerges from the… and enters the thigh via the ____

A

Medial border of Psoas major
Obturator foramen

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14
Q

What does the obturator nerve innervate?

A
  • adductors of thigh
  • skin medial & above knee
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15
Q

The femoral nerve emerges from the… and separates into…

A
  • lateral border of psoas major
  • ant femoral cutaneous branches & saphenous n near the inguinal ligament
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16
Q

What does the femoral nerve innervate?

A
  • knee extensors
  • thigh flexors
  • skin of anteriomedial thigh
17
Q

The ____ brings L4 to L5 nerve roots into the lumbosacral plexus

A

Lumbosacral trunk

18
Q

What spinal levels contain axons for preganglionic sympathetic neurons that leave the spinal cord via ventral roots?

A

T1-L2

19
Q

Preganglionic sympathetic neurons that leave the spinal cord via ventral roots pass through the ____

A

White communicating branches (white rami communicans)

20
Q

Gray rami communicans pass from ____ to ____

A

Paravertebral ganglion
Adjacent ventral rami

21
Q

The thoracic sympathetic trunk passes under the ____ and becomes the ____

A

Medial Arcuate ligament
Lumbar sympathetic trunk

22
Q

What divisions are in the sciatic nerve?

A

Anterior & posterior
(L4-S3)

23
Q

Describe the path of the sciatic nerve

A
  • exits via greater sciatic foramen
  • emerges from inferior border of piriformis
  • runs into popliteal fossa
  • branches into tibial & common fibular nerves
24
Q

What divisions of the lumbosacral plexus make up the tibial division of the sciatic nerve?

A

Anterior

25
Q

What divisions of the lumbosacral plexus make up the common fibular division of the sciatic nerve?

A

Posterior

26
Q

What divisions of the lumbosacral plexus make up the posterior femoral cutaneous nerve?

A

Anterior & posterior

27
Q

Describe the path of the posterior femoral cutaneous nerve

A
  • exits via greater sciatic foramen
  • runs deep to gluteus maximus & emerges from inferior border
28
Q

Which nerves are derived from the anterior division of the lumbosacral plexus?

A
  • tibial
  • n to quadratus femoris
  • n to obturator internus
  • pudendal n
  • n to Levator ani & coccygeus
29
Q

Which nerves are derived from the posterior division of the lumbosacral plexus?

A
  • common fibular
  • superior gluteal
  • inferior gluteal
  • n to piriformis
  • perforating cutaneous
30
Q

Name 2 nerves that have mixed anterior and posterior divisions of the lumbosacral plexus

A

Sciatic
Posterior femoral cutaneous

31
Q

The inferior cluneal nerves contain branches of ____ indicating…

A

Ventral rami
Lower extremity (appendicular skeleton) begins

32
Q

The superior and middle cluneal nerves contain branches of ____

A

Dorsal rami

33
Q

What spinal levels are in the lumbosacral plexus?

A

L4-S3

Gross Anatomy II NYCC (18 decks)

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