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Anatomy

Abdomen

Question 126 of 180

A 23 year old patient is brought to ED following a road traffic accident. CT imaging demonstrates retroperitoneal injury. Which of the following organs is most likely affected:

Answer:

The ascending colon is the only organ listed which is retroperitoneal.

The peritoneum is a continuous double-layered serous membrane. The parietal peritoneum lines the walls of the abdominal cavity and the visceral peritoneum lines the viscera. Between the parietal and visceral layers of peritoneum is a potential space, the peritoneal cavity.

Intraperitoneal vs. Retroperitoneal

Abdominal viscera are either suspended in the peritoneal cavity by folds of peritoneum called mesenteries (intraperitoneal viscera) or are outside the peritoneal cavity bound to the posterior abdominal wall (retroperitoneal viscera). Retroperitoneal organs are only covered in peritoneum on their anterior surface.

A useful mnemonic to help remember which abdominal organs are retroperitoneal is SAD PUCKER:

  • Suprarenal glands
  • Aorta and Inferior vena cava
  • Duodenum (2nd and 3rd parts)
  • Pancreas (except for the tail)
  • Ureters (proximal) and Bladder
  • Colon (ascending and descending)
  • Kidneys
  • (O)esophagus
  • Rectum (lower two-thirds)

By OpenStax College [CC BY 3.0 , via Wikimedia Commons

Peritoneum. (Image by OpenStax College [CC BY 3.0 , via Wikimedia Commons)

Innervation

The parietal peritoneum associated with the abdominal wall is innervated by somatic afferents carried in branches of the associated spinal nerves and is therefore sensitive to pressure, pain and temperature, and gives rise to well-localised pain. The diaphragmatic peritoneum is supplied by the phrenic nerve (C3 - C5) and the remainder of the parietal peritoneum is supplied segmentally by intercostal and lumbar nerves.

The visceral peritoneum is innervated by visceral afferents that accompany autonomic nerves back to the CNS and therefore activation gives rise to referred and poorly localised sensations of discomfort and to visceral motor activity.

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  • Biochemistry
  • Blood Gases
  • Haematology
Biochemistry Normal Value
Sodium 135 – 145 mmol/l
Potassium 3.0 – 4.5 mmol/l
Urea 2.5 – 7.5 mmol/l
Glucose 3.5 – 5.0 mmol/l
Creatinine 35 – 135 μmol/l
Alanine Aminotransferase (ALT) 5 – 35 U/l
Gamma-glutamyl Transferase (GGT) < 65 U/l
Alkaline Phosphatase (ALP) 30 – 135 U/l
Aspartate Aminotransferase (AST) < 40 U/l
Total Protein 60 – 80 g/l
Albumin 35 – 50 g/l
Globulin 2.4 – 3.5 g/dl
Amylase < 70 U/l
Total Bilirubin 3 – 17 μmol/l
Calcium 2.1 – 2.5 mmol/l
Chloride 95 – 105 mmol/l
Phosphate 0.8 – 1.4 mmol/l
Haematology Normal Value
Haemoglobin 11.5 – 16.6 g/dl
White Blood Cells 4.0 – 11.0 x 109/l
Platelets 150 – 450 x 109/l
MCV 80 – 96 fl
MCHC 32 – 36 g/dl
Neutrophils 2.0 – 7.5 x 109/l
Lymphocytes 1.5 – 4.0 x 109/l
Monocytes 0.3 – 1.0 x 109/l
Eosinophils 0.1 – 0.5 x 109/l
Basophils < 0.2 x 109/l
Reticulocytes < 2%
Haematocrit 0.35 – 0.49
Red Cell Distribution Width 11 – 15%
Blood Gases Normal Value
pH 7.35 – 7.45
pO2 11 – 14 kPa
pCO2 4.5 – 6.0 kPa
Base Excess -2 – +2 mmol/l
Bicarbonate 24 – 30 mmol/l
Lactate < 2 mmol/l

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