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Questions Answered: 26
Final Score 46%
12
14
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Anatomy
Upper Limb
Question 135 of 180
A 45 year old man presents to the ED after falling onto railings. One protruding railing punctured his right axilla, your consultant suspects a musculocutaneous nerve injury. Which of the following structures/areas would you least expect to be affected by this injury:
Answer:
The musculocutaneous nerve innervates all the muscles in the anterior compartment of the arm (the coracobrachialis, the biceps brachii and the brachialis) and gives rise to the lateral cutaneous nerve of the forearm, which supplies the skin on the lateral surface of the forearm.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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