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Anatomy

Upper Limb

Question 126 of 239

You are asked by a consultant to perform a neurological examination of the upper limb on a gentleman presenting with left arm weakness. You note he has marked weakness of the triceps brachii. The triceps brachii is innervated by which of the following nerves:

Answer:

The triceps brachii muscle is innervated by the radial nerve.

Triceps Brachii Muscle

Anatomy / Upper Limb / Posterior Arm

Last Updated: 20th February 2019

Table: Function and Innervation of the Triceps Brachii Muscle

Muscle Triceps Brachii
Function Extension of forearm at elbow (primary), extension and adduction of arm at glenohumeral joint (via long head)
Innervation Radial nerve

The triceps brachii is the chief extensor of the forearm at the elbow joint and acts as an accessory adductor and extensor of the arm at the glenohumeral joint via its long head.

The triceps brachii muscle is innervated by the radial nerve.

Henry Vandyke Carter [Public domain], via Wikimedia Commons

Triceps Brachii Muscle. (Image modified by FRCEM Success. Original By Henry Vandyke Carter [Public domain], via Wikimedia Commons)

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Close
  • 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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