Anterior Abdominal Wall

Question 1

Dermatome of anterior abdomen wall

Answer 1

Xiphisternum T 7

Umbilicus T 10

Inguinal T 12 , L 1

Question 2

9 regions

Answer 2

RHC Epigastric LHC

RtLumbar Umbilical LtLumbar

 RtIliac  Hypogastric  LtIliac

Question 3

9 regions planes

Answer 3

Horizontal planes

• Subcostal ( L3 )
• Transtubercular ( L5 )

Vertical planes

• Rt Midclavicular
• Lt Midclavicular

Question 4

Subcostal plane

Answer 4

• inferior points of 10th costal margin

- L3

Question 5

Transtubercular plane

Answer 5

• pass through iliac crest

- L5

Question 6

Transpyloric plane ( Addison’s plane )

Answer 6

• L1
• midway between jugular notch and pubic symphysis
• midway between xiphisternum & umbilicus

Question 7

Transpyloric plane changes

Answer 7

TRANSPyLOFIC

T  - tip of 9th costal cartilage
R  - renal hilum 
     - root of transverse mesocolon
A  - Aorta : SMA arises
N  - neck of pancreas
S  - splenic vein runs transversely behind pancreas
Py - Pylorus 
     - Portal vein origin
L   - L1 lower border
O  - Oddi : sphincter of Oddi
F   - fundus of gall bladder
I    - Duodenumjejunum junction
C  - Cysterna chyli

Question 8

Contents of Rectus sheath

Answer 8

2 muscles

• Rectus abdominis
• Pyramidalis

2 arteries

• Superior epigastric vessels
• Inferior epigastric vessels

6 nerves
- ventral rami of lower 6 nerves

Question 9

Rectus sheath formation

Answer 9

Above the costal margin

Anterior - EO aponeurosis
Posterior - costal cartilages 5-7 ribs

Above the arcuate line

Anterior - EO aponeurosis + IO aponeurosis
Posterior - IO aponeurosis + TA aponeurosis

Below the arcuate line

Anterior -aponeurosis of EO , IO , TA
Posterior - nothing