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Questions Answered: 238

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200
38

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Anatomy

Upper Limb

Question 146 of 239

You are examining the left arm of a patient who presents after being stabbed in the axilla. You note loss of sensation over the lateral forearm and suspect a musculocutaneous nerve injury. The musculocutaneous nerve arises from which of the following cord(s) of the brachial plexus:

Answer:

The musculocutaneous nerve originates from the lateral cord, receiving fibres from C5 - C7.

Musculocutaneous Nerve

Anatomy / Upper Limb / Anterior Arm / Innervation of Upper Limb

Last Updated: 8th April 2019

The musculocutaneous nerve originates from the lateral cord of the brachial plexus, receiving fibres from C5 - C7.

Table: Anatomical Overview of the Musculocutaneous Nerve

Nerve Musculocutaneous
Nerve roots C5 – C7
Plexus cords Lateral
Motor Supply Anterior compartment of arm (coracobrachialis, biceps brachii, brachialis)
Sensory supply Lateral forearm (via the lateral cutaneous nerve of the forearm)

Anatomical Course

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

Function

It innervates all of the muscles in the anterior compartment of the arm (the coracobrachialis, the biceps brachii and the brachialis muscles) and gives rise to the lateral cutaneous nerve of the forearm, which supplies the skin on the lateral surface of the forearm.

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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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