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Anatomy
Lower Limb
Question 180 of 180
Superficial fibular nerve palsy results in which of the following clinical features:
Answer:
Damage to the superficial fibular nerve results in loss of eversion of the foot and loss of sensation over the lower anterolateral leg and the dorsum of the foot.Superficial Fibular Nerve
Anatomy / Lower Limb / Innervation of Lower Limb / Lateral Leg
Last Updated: 6th December 2020
The superficial fibular nerve is a branch of the common fibular nerve.
Table: Anatomical Overview of the Superficial Fibular Nerve
| Nerve | Superficial Fibular |
|---|---|
| Nerve roots | L4 – S1 |
| Motor supply | Lateral compartment of leg |
| Sensory supply | Lower anterolateral leg and dorsum of foot |
| Injury | Loss of eversion of the foot and loss of sensation over the lower anterolateral leg and dorsum of foot |
Anatomical Course
Superficial Fibular Nerve. (Image by Henry Vandyke Carter [Public domain], via Wikimedia Commons)
Function
It innervates the fibularis longus and the fibularis brevis in the lateral leg. It supplies the skin over the lower anterolateral leg and the dorsum of the foot (except for the webspace between the 1st and 2nd digit supplied by the deep fibular nerve, and the lateral side of the little toe, supplied by the sural branch of the tibial nerve).
Table: Motor Supply of the Superficial Fibular Nerve
| Muscle | Function |
|---|---|
| Fibularis longus | Plantarflexion and eversion of foot, support of lateral and transverse arch |
| Fibularis brevis | Eversion of foot |
![Modified by FRCEM Success. Original by Henry Vandyke Carter [Public domain], via Wikimedia Commons](https://mrcemsuccess.com/wp-content/uploads/2017/01/Cutaneous-Innervation-Leg.png)
Cutaneous Innervation of Lower Limb. (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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