Anatomical landmarks - abdomen

Question 1

What superficial anatomical landmarks mark the transpyloric plane?

Answer 1

The transpyloric plane is found half way between the jugular notch and the pubis

Question 2

What 8 structures are found at the transpyloric plane?

Answer 2

1. Pylorus
2. GB fundus
3. Pancreatic tail
4. Renal hilar vessels lie at either side
5. SMA
6. Portal venous formation
7. Cisterna chyle
8. Start of conus medullaris

Question 3

What rami contribute to the lumbar plexus?

Answer 3

The anterior rami of L1-L4

Question 4

List the 8 nerves arising from the lumbar plexus

Answer 4

1. Sub-costal nerve (actually T12)
2. Iliohypogastric nerve
3. Ilioinguinal nerve (= the collateral branch of iliohypogestric)
4. Lateral cutaneous nerve of the thigh
5. Femoral nerve
6. Genitofemoral nerve
7. Obturator nerve
8. Lumbosacral trunk

Question 5

What nerve may pierce the inguinal ligament?

Answer 5

The lateral cutaneous nerve of the thigh

Question 6

Where is the genitofemoral nerve found?

Answer 6

Running along psoas

Question 7

What ramus contributes to the iliohypogastric nerve?

Answer 7

L1

Question 8

What ramus contributes to the ilioinguinal nerve?

Answer 8

L1

Question 9

What rami contribute to the lateral cutaneous nerve of the thigh?

Answer 9

L2,3

Question 10

What rami contribute to the femoral nerve?

Answer 10

L2,3,4

Question 11

What rami contribute to the obturator nerve?

Answer 11

L2,3,4

Question 12

What rami contribute to the genitofemoral nerve?

Answer 12

L1,2

Question 13

What rami contribute to the lumbosacral trunk?

Answer 13

L4,5