1.2 The Muscles of the Anterior Abdominal Wall Flashcards

1
Q

What are the 3 Flat Muscles which form part of the Antero-Lateral Abdominal Wall?
(Superficial to Deep)

A
  1. The External Oblique
  2. The Internal Oblique
  3. The Transverse Abdominis
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2
Q

What are the Actions of the External Oblique?

A
  1. Compress and Support the Viscera

2. Flex and Rotate the Trunk

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3
Q

What are the Actions of the Internal Oblique?

A
  1. Compress and Support the Viscera

2. Flex and Rotate the Trunk

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4
Q

What are the Actions of the Transverse Abdominis?

A

Compress and Support the Viscera

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5
Q

What is the innervation for the External Oblique?

A

The Anterior Rami of T7-T12:

  1. The Thoraco-Abdominal Nerves of T7 to T11
  2. The Sub-Costal Nerve - T12
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6
Q

What is the innervation for the Internal Oblique?

A

The Anterior Rami of T7-L1

  1. The Thoraco-Abdominal Nerves of T7 to T11
  2. The Sub-Costal Nerve - T12
  3. The First Lumbar Vertebrae - L1
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7
Q

What is the innervation for the Transverse Abdominis?

A

The Anterior Rami of T7-L1

  1. The Thoraco-Abdominal Nerves of T7 to T11
  2. The Sub-Costal Nerve - T12
  3. The First Lumbar Vertebrae - L1
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8
Q

What are the Longitudinal Muscles which form part of the Antero-Lateral Abdominal Wall?

A
  1. The Rectus Abdominis

2. Pyramidalis Muscle

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9
Q

What are the Actions of the Rectus Abdominis?

A
  1. Flexes the Trunk
  2. Compresses Viscera
  3. Controls the Tilt of the Pelvis
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10
Q

Superior to the Umbilicus, where does the Rectus Abominis lie?

A

Within the Rectus Sheath

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11
Q

Inferior to the Umbilicus, where does the Rectus Abdominis lie?

A

Deep to the Rectus Sheath

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12
Q

What is the Pyramidalis Muscle?

A

A small triangular muscle, anterior to the Rectus Abdominis, contained within the Rectus Sheath which Tenses the Linea Alba (The White Fibrous Tissue between the Xiphoid Process and the Pubic Symphysis).

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13
Q

What is the Rectus Sheath?

A

The Aponeurosis of the External Oblique, Internal Oblique, and Transverse Abdominis

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14
Q

What is an Aponeurosis?

A

A sheet of White Fibrous Tissue which takes the place of a Tendon, in Sheet-Like Muscles (having wider areas of attachments)

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15
Q

At what level is the position of the Umbilicus on the Abdominal Wall?

A

L3 / L4

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16
Q

What is the Dermatome which covers the Umbilicus?

A

T10

17
Q

What is the Umbilicus a good Surface Landmark of?

A

The Abdominal Aorta Bifurcation

18
Q

Which Thoracic Spinal Segments innervate the Anterior Abdominal Wall?

A

T7 to T12