Mandibular Nerve: Origin, Course, Relations, Branches and Applied Anatomy
Describe mandibular nerve under following headings:
Origin Division and branches Course and relations Applied aspects
OR
Describe origin, course, relations, branches and applied anatomy of mandibular nerve.
Answer:
Mandibular Nerve:
- It is nerve of first branchial arch
Mandibular Nerve Origin:
- Mandibular nerve originates in the middle cranial fossa through its roots
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Mandibular Nerve Branches:
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- Sensory root
- It is large root
- Arises from the lateral part of the trigeminal ganglion
- Leaves the cranial cavity through the foramen ovale
- Motor root
- Smaller root
- Lies deep to the trigeminal ganglion
- Passes through foramen ovale
- Joins sensory root
- Forms main trunk
- After a short course, main trunk divides into
- Small anterior trunk
- Large posterior trunk
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Mandibular Nerve Termination:
- It terminates by dividing into small anterior trunk & large posterior trunk
Mandibular Nerve Relations:
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Mandibular Nerve Applied Aspects:
- Motor root of mandibular nerve is tested by asking the patient of clench her/his teeth
- In carcinoma of tongue pain is radiated to ear and temporal fossa
- To treat trigeminal neuralgia, sensory root of nerve is divided behind the ganglion
- Mandibular nerve supplies efferent and afferent loops of jawjerk reflex
- During extraction of mandibular teeth inferior alveolar nerve block is given
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