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Anatomy

Head and Neck

Question 34 of 180

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

Answer:

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

Temporalis Muscle

Anatomy / Head and Neck / Scalp

Last Updated: 11th April 2019

Table: Overview of the Temporalis Muscle

Muscle Temporalis
Origin Bony surface of temporal fossa superior to the inferior temporal line
Insertion Coronoid process of mandible and along anterior margin of ramus of mandible
Action Elevation of mandible, retraction of mandible, side-to-side movements of mandible
Innervation Mandibular division of trigeminal nerve

Attachments

The temporalis muscle is a large fan-shaped muscle that fills much of the temporal fossa. It originates from the bony surfaces of the temporal fossa superiorly to the inferior temporal line and is attached laterally to the surface of the temporal fascia. Distally it inserts onto the coronoid process of the mandible and along the anterior margin of the ramus of the mandible (almost to the last molar tooth).

Function

The temporalis is a powerful elevator of the mandible, acts to retract the mandible and also participates in side-to-side movements of 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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