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Anatomy

Lower Limb

Question 14 of 180

The fibularis brevis muscle is innervated by which of the following nerves:

Answer:

Both the fibularis longus and brevis are innervated by the superficial fibular nerve.

Lateral Leg Muscles

Table: Function and Innervation of the Lateral Leg Muscles

Muscle Function Innervation Distal Attachment
Fibularis longus Plantarflexion and eversion of foot, support of lateral and transverse arches Superficial fibular nerve 1st metatarsal and medial cuneiform
Fibularis brevis Eversion of foot Superficial fibular nerve 5th metatarsal

Function

The fibularis longus and brevis act together to evert the foot. The fibularis longus also assists in plantarflexion of the foot and supports the arches of the foot (mainly the lateral and transverse arches).

Innervation

Both the fibularis longus and brevis are innervated by the superficial fibular nerve.

Attachments

Both tendons of the fibularis longus and brevis pass posterior to the lateral malleolus in a shallow bony groove before swinging forward to enter the lateral side of the foot. The fibularis brevis then curves forward across the lateral surface of the calcaneus to attach to a tubercle on the lateral surface of  the base of the 5th metatarsal. The fibularis longus descends obliquely down the lateral side of the foot before swinging under the foot to cross the sole and attach to the inferior surfaces of the base of the 1st metatarsal and the medial cuneiform bones.

Modified by FRCEM Success. Original by Henry Vandyke Carter [Public domain], via Wikimedia Commons

Lateral Leg Muscles: Fibularis Longus (red), Fibularis Brevis (green). (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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