Muscles of the Posterior Abdominal Wall Flashcards

1
Q

Name the muscles of the posterior abdominal wall

A

Psoas Major
Iliacus
Quadratus lumborum

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2
Q

Psoas Major - Origin

A

Transverse processes of Lumbar vertebrae

Sides of the bodies and IV discs of T12-S1

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3
Q

Psoas Major - Insertion

A

strong tendon to lesser trochanter of femur

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4
Q

Psoas Major - Innervation

A

lumbar plexus via anterior branches of nerves L2-L4

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5
Q

Psoas Major - Action

A

inferiorly - flexes thigh
superiorly - flexes vertebral column laterally to balance trunk
sitting - flex trunk

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6
Q

Illiacus - Origin

A

Superior 2/3rds of iliac fossa
ala of sacrum
anterior sacro-iliac ligaments

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7
Q

Illiacus - Insertion

A

lesser trochanter of femur and shaft inferior to is and to psoas major tendon

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8
Q

Illiacus - Innervation

A

femoral nerve (L2-L4)

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9
Q

Illiacus - Action

A

Anterior branches of T12 and L1-L4 nerves

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10
Q

Quadratus Lumborum - Origin

A

Medial half of inferior border of 12th rib and tips of lumbar transverse processes

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11
Q

Quadratus Lumborum - Insertion

A

Iliolumbar ligament and internal lip of iliac crest

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12
Q

Quadratus Lumborum - Innervation

A

Anterior branches of T12 and L1-L4 nerves

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13
Q

Quadratus Lumborum - Action

A

Extends and laterally flexes vertebral column

fixes 12th rib during inspiration

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