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Anatomy

Upper Limb

Question 34 of 180

A 67 year old patient complains of weakness of abduction and adduction of his fingers. You suspect weakness of the interossei. Regarding the interossei muscles, which of the following statements is INCORRECT:

Answer:

The four dorsal interossei act to abduct the index, middle and ring fingers, and the three palmar interossei act to adduct the index, ring and little fingers. (DAB, PAD).

Interosseus Muscles

Anatomy / Upper Limb / Wrist and Hand

Last Updated: 10th April 2019

Attachments

  • The interossei muscles originate from and lie between the metacarpal bones.
  • The dorsal interossei insert into the extensor hoods and proximal phalanges of the index, middle and ring finger.
  • The palmar interossei insert into the extensor hoods of the index, ring and little finger.

Function

  • The four dorsal interossei act to abduct the index, middle and ring fingers at the MCPJs (DAB).
  • The three palmar interossei act to adduct the index, ring and little fingers at the MCPJs (PAD).
  • Because the interossei muscles insert into the extensor hoods, they also contribute to the complex flexion and extension movements of the interphalangeal joints of the digits.

Innervation

  • The interossei muscles are all innervated by the ulnar nerve.

Modified by FRCEM Success. Original by By OpenStax [CC BY 4.0 , via Wikimedia Commons

Interossei Muscles. (Image modified by FRCEM Success. Original by OpenStax [CC BY 4.0 , 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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