C1:S2 - Muscles of the Anterior Abdominal Wall Flashcards

1
Q

What are the muscles of the anterior abdominal wall?

A
External
Oblique 
Internal Oblique
Transversus Abdominis
Rectus Abdominis
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2
Q

What is the action of the external oblique?

A

Compress and Support abdominal viscera

Flex and rotate trunk

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3
Q

What is the innervation of the external oblique?

A

Anterior Rami of T7 to T12

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4
Q

What is the action of the internal oblique?

A

Compress and Support abdominal viscera
Flex and rotate trunk
Accessory resp muscle
Antagonist to diaphragm

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5
Q

What is the innervation of the internal oblique?

A

Anterior Rami of T7 to L1

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6
Q

What is the action of transversus abdominis?

A

Compress and support abdominal viscera
Thoracic and pelvic stability
Abdominal Movement

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7
Q

What is the innervation of transversus abdominis?

A

Anterior Rami of T7 to L1

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8
Q

What is the action of rectus abdominis?

A

Flex trunk
Compress viscera
Stabilise and control tilt of pelvis

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9
Q

What is the innervation of rectus abdominis?

A

Anterior Rami of T7 to T12

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10
Q

What is the difference in arrangement of the rectus sheath below and above the level of the umbilicus?

A

Above
External and 1/2 of the internal oblique aponeurosis run ANTERIOR to the rectus
The rest run posterior

Below
All aponeurosis lie anterior to rectus abdominis

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11
Q

What is the rectus sheath?

A

Aponeurosis of Ext Ob, Int Ob, and Trans Ab

Long fibrous sheath in centre of anterior abdominal wall

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12
Q

Which muscles are contained within the rectus sheath?

A

Recuts abdominis

Pyramidalis

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13
Q

At which vertebral level is the umbilicus

A

IV Disk L3 to L4

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14
Q

What can the umbilicus be used to identify and why is it a bad surface landmark?

A

Can be used to identify the bifurcation of the aorta

Bad surface landmark as its position is dependent on body fat levels

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15
Q

What thoracic spinal segments innervate the anterior abdominal wall?

A

T7 to T12

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16
Q

Identify significant landmarks on the dermatome map

A

T2 - Apex of Axilla
T4 - Nipples
T10 - Umbilicus
L1 - Inguinal Canal