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Anatomy

Head and Neck

Question 135 of 180

The masseter muscle is innervated by which of the following nerves:

Answer:

The masseter muscle is innervated by the mandibular division of the trigeminal nerve.

Masseter Muscle

Anatomy / Head and Neck / Parotid Region

Last Updated: 4th April 2022

The masseter muscle overlies the lateral surface of the ramus of the mandible.

Table: Overview of the Masseter Muscle

Muscle Masseter
Origin Zygomatic arch and maxillary process of zygomatic bone
Insertion Lateral surface of ramus of mandible
Action Elevation of mandible
Innervation Mandibular division of trigeminal nerve

Attachments

It originates from the zygomatic arch and the maxillary process of the zygomatic bone and inserts onto the lateral surface of the ramus of the mandible.

Function

The masseter muscle is a powerful muscle of mastication that elevates the mandible.

Innervation

It is innervated by the mandibular division of the trigeminal nerve.

Muscles of mastication

Muscles of Mastication. (Image 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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