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Questions

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Anatomy

Thorax

Question 75 of 180

The T6 dermatome is best tested at which of the following landmarks:

Answer:

The T6 dermatome is best tested at the midclavicular line, located at the level of the xiphisternum.

Dermatomal Supply of Trunk

Table: Dermatomal Supply of the Trunk

Dermatome Landmark
T1 Medial antecubital fossa
T2 Apex of axilla
T3 Third intercostal space
T4 Level of nipples (fourth intercostal space)
T5 Fifth intercostal space
T6 Level of xiphisternum
T7 One-quarter distance between xiphisternum and umbilicus
T8 One-half distance between xiphisternum and umbilicus
T9 Three-quarter distance between xiphisternum and umbilicus
T10 Level of umbilicus
T11 Midway between umbilicus and inguinal ligament
T12 Midpoint of inguinal ligament

By Grant, John Charles Boileau (An atlas of anatomy, / by regions 1962) [Public domain], via Wikimedia Commons

Dermatome Map. (Image by Grant, John Charles Boileau (An atlas of anatomy, / by regions 1962) [Public domain], via Wikimedia Commons)

The T3 dermatome is best tested at the midclavicular line and the third intercostal space.

The T4 dermatome is best tested at the midclavicular line and the fourth intercostal space, located at the level of the nipples.

The T5 dermatome is best tested at the midclavicular line and the fifth intercostal space, located midway between the level of the nipples and the level of the xiphisternum.

The T6 dermatome is best tested at the midclavicular line, located at the level of the xiphisternum.

The T7 dermatome is best tested at the midclavicular line, one quarter the distance between the level of the xiphisternum and the level of the umbilicus.

The T8 dermatome is best tested at the midclavicular line, one half the distance between the level of the xiphisternum and the level of the umbilicus.

The T9 dermatome is best tested at the midclavicular line, three quarters of the distance between the level of the xiphisternum and the level of the umbilicus.

The T10 dermatome is best tested at the midclavicular line, located at the level of the umbilicus.

The T11 dermatome is best tested at the midclavicular line, midway between the level of the umbilicus and the inguinal ligament.

The T12 dermatome is best tested at the midclavicular line, over the midpoint of the inguinal ligament.

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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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