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Anatomy

Lower Limb

Question 125 of 180

Which one of the following muscles is NOT innervated by the deep fibular nerve:

Answer:

The deep fibular nerve supplies the muscles in the anterior compartment of the leg. The fibularis longus is in the lateral compartment of the leg and innervated by the superficial fibular nerve.

The deep fibular nerve is a branch of the common fibular nerve.

Table: Anatomical Overview of the Deep Fibular Nerve

Nerve Deep Fibular
Nerve roots L4 -L5
Motor supply Anterior compartment of leg
Sensory supply Webspace between 1st and 2nd toes
Injury Motor Loss: Loss of dorsiflexion of ankle and extension of toes, foot drop with high-stepping gait, weakness of foot inversion

Sensory Loss: Loss of sensation over webspace between 1st and 2nd toes

Anatomical Course

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

Function

It innervates the anterior leg (tibialis anterior, extensor hallucis longus, extensor digitorum longus, fibularis tertius) and the dorsal intrinsic muscles of the foot. It supplies skin over the webspace between the 1st and 2nd toes.

Table: Motor Supply of the Deep Fibular Nerve

Muscle Function
Tibialis anterior Dorsiflexion and inversion of foot, support of medial arch of foot
Extensor hallucis longus Extension of great toe and dorsiflexion of foot
Extensor digitorum longus Extension of lateral four toes and dorsiflexion of foot
Fibularis tertius Dorsiflexion and 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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