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Anatomy

Head and Neck

Question 63 of 190

A 45 year old man, who has previously sustained significant head trauma, presents to ED complaining of numbness over the tip of his nose. Which of the following nerves is most likely affected:

Answer:

The external nose is innervated by:
  • the infratrochlear nerve (ophthalmic nerve) supplying the bridge of the nose
  • the external nasal nerve (ophthalmic nerve) supplying the lower anterior nose
  • the infraorbital nerve (maxillary nerve) supplying the sides of the lower nose.

External Nose

Anatomy / Head and Neck / Nose and Paranasal Region

Last Updated: 11th April 2019

Blood Supply

The blood supply to the external nose is derived mainly from branches of the ophthalmic and facial arteries.

Innervation

The cutaneous supply of the external nose is from:

  • the external nasal nerve (ophthalmic nerve) innervating the anterior lower half of the nose
  • the infratrochlear nerve (ophthalmic nerve) innervating the bridge of the nose
  • the infraorbital nerve (maxillary nerve) innervating the sides of the nose

By Patrick J. Lynch, medical illustrator (Patrick J. Lynch, medical illustrator) [CC BY 2.5], via Wikimedia Commons

Cutaneous Innervation of the Head. (Image by Patrick J. Lynch, medical illustrator [CC BY 2.5], 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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