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Anatomy

Head and Neck

Question 52 of 180

Regarding the subclavian artery, which of the following statement is INCORRECT:

Answer:

The right subclavian artery begins posterior to the sternoclavicular joint as a branch of the brachiocephalic trunk. The left subclavian artery begins more inferiorly as a direct branch of the arch of the aorta and ascends posterior to the left common carotid artery.

Subclavian Artery

Anatomy / Head and Neck / Neck

Last Updated: 12th February 2019

The subclavian arteries on both sides arch upward out of the thorax to enter the root of the neck.

The right subclavian artery begins posterior to the sternoclavicular joint as a branch of the brachiocephalic trunk.

The left subclavian artery begins more inferiorly as a direct branch of the arch of the aorta and ascends posterior to the left common carotid artery.

By Henry Vandyke Carter [Public domain or Public domain], via Wikimedia Commons

Subclavian Artery. (Image by Henry Vandyke Carter [Public domain], via Wikimedia Commons)

Each subclavian artery arches superiorly and laterally to pass anterior to the extension of the pleural cavity in the root of the neck and posterior to the anterior scalene muscle, becoming the axillary artery as it crosses the lateral border of rib I.

Modified by FRCEM Success. Original by Henry Vandyke Carter [Public domain], via Wikimedia Commons

Root of the Neck. (Image modified by FRCEM Success. Original by Henry Vandyke Carter [Public domain], via Wikimedia Commons)

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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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