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36

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Anatomy

Lower Limb

Question 130 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

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

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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