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144
36

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Anatomy

Head and Neck

Question 30 of 180

The facial artery arises from which of the following blood vessels:

Answer:

The facial artery is a branch of the external carotid artery.

Arterial Supply of Face

Facial Artery

The facial artery, branch of the external carotid artery, is the major blood vessel supplying the face.

After arising from the external carotid artery, the facial artery passes up through the deep structures of the neck and appears at the lower border of the mandible after passing posterior to the submandibular gland. Curving around the inferior border of the mandible, just anterior to the masseter muscle, the facial artery then enters the face where it runs upwards and medially in a tortuous course. It passes along the side of the nose and terminates as the angular artery at the medial corner of the eye.

Transverse Facial Artery

Another contributor to the vascular supply of the face is the transverse facial artery, which arises from the superficial temporal artery within the substance of the parotid gland.

Superficial Temporal Artery

The superficial temporal artery is the smaller of the two terminal branches of the external carotid artery; it passes superiorly, just anterior to the ear, divides into anterior and posterior branches and supplies almost the entire lateral aspect of the scalp.

Blood Supply of the Face. (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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