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Lesson Posted on 04 Sep Tuition/MBBS & Medical Tuition/Anatomy

Mandibular Nerve

Dr. S. P. Geetha

I love to teach students in the way they can understand. Since Anatomy is the basic subject for doctors...

MANDIBULAR NERVE Largest mixed branch of trigeminal N Nerve of first pharyngeal arch Associated with Otic & submandibular ganglion Formation & Divisions Begins in middle cranial fossa - Large sensory root – arises from lateral part of trigeminal ganglion - Leaves... read more

 

 

MANDIBULAR NERVE

  • Largest mixed branch of trigeminal N
  • Nerve of first pharyngeal arch
  • Associated with Otic & submandibular ganglion

Formation & Divisions

 

  • Begins in middle cranial fossa

- Large sensory root

– arises from lateral part of trigeminal ganglion

- Leaves the cranial cavity through foramen ovale

- Small motor root

-Passes deep to the trigeminal ganglion

-Passes through foramen ovale

-Joins with sensory root below the foramen forming the main trunk

-Lies in the infratemporal fossa, on the tensor veli palatini, deep to lateral pterygoid

Then divides into anterior & posterior divisions

Branches from Main trunk

  • Meningeal N

– enters the cranial cavity through foramen spinosum

- Supplies the meninges of middle cranial fossa

  • N to medial pterygoid

-Supplies medial pterygoid

-Gives a motor root to otic ganglion without relay supplies tensor veli palatini & tensor tympani

Branches from anterior division

3 motor branches

-Masseteric N

-Deep temporal Ns

-N to lateral pterygoid

 

1 sensory branch

- Buccal N

 

 

Branches from posterior division

Mostly sensory

  • Auriculotemporal N

-Arises by two root

-Encircles Middle meningeal A

-Auricular part – supplies skin of tragus, upper part of pinna, external acoustic meatus & tympanic membrane

-Temporal part – supplies temple, TMJ, carries secretomotor & sensory fibres to parotid gland,

 

  • Lingual N

-One of the two terminal branches of posterior division

-Begins 1cm below the skull

-Runs b/n tensor veli palatini & lateral pterygoid. Then b/n lateral & medial pterygoid.

-2cms below the skull it is joined by chordatympani N

-Emerging at the lower border of lateral pterygoid

-Runs downwards & forwards b/n ramus of mandible & medial pterygoid

-Lies direct contact to mandible behind 3rd molar tooth

-Runs over hyoglossus & genioglossus, deep to mylohyoid

-Winds around submandibular duct & divides into terminal branches

 

  • Inferior alveolar Nerve

-Larger terminal branch

-Runs vertically down lateral to the medial pterygoid & sphenomandibular ligament.

-Enters mandibular foramen, runs in mandibular canal,

-Accompanied by inferior alveolar A

-Branches

1. Mylohyoid branch

– only motor fibre from posterior division

-Pierces sphenomanibular ligament along with mylohyoid A

-Runs in mylohyoid groove

-Supplies mylohyoid & anterior belly of digastric muscle

2. in the mandibular canal it gives branches to supply lower teeth & gums

3. Mental N

– emerges from mental foramen, supplies skin of chin, skin & mucous membrane of lower lip.

- Its incisive branch supplies labial aspect of gums of canine & incisor teeth

Clinical Anatomy

  • Motor part of mandibular N is tested by asking the patient to clench teeth. If one side masseter paralyzed, jaw deviates to paralyzed side while opening the mouth by the action of lateral pterygoid of opposite side
  • Referred pain – in case of cancer of tongue, pain radiates to the ear & temporal fossa along the distribution of auriculotemporal N, lingual N

Lingual N is divided to relieve intractable pain. Done where the nerve lies in contact with mandible below & behind the 3rd molar tooth.

  • In extraction of wisdom tooth lingual N should be taken care. Its injury results sensory loss in anterior 2/3 of tongue
  • A lesion at foramen ovale leads to paraesthesia along mandible, tongue, temporal region, paralysis of muscles of mastication, loss of jaw jerk
  • In extraction of tooth, inferior alveolar N needs to be anaesthetized. The drug is given before the N enters the mandibular canal.
  • Inferior alveolar N can be damaged in the fracture of mandible.
  • During extraction of 3rd molar tooth, buccal N may be involved resulting in temporary numbness of cheek

 

 

Trigeminal neuralgia

  • Intractable pain along distribution of mandibular N
  • In this sensory root may be divided behind the ganglion
  • During division ophthalmic fibres lie in the superomedial part of root are spared to preserve the corneal reflex.

 

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Answered on 25 Aug Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

Madan Krishna

Tutor

Dear jogendra, there are many websites and YouTube channels to teach medical subjects.. Medcramvideos channel gives complete medical course and doctor najeeb channel also teaches 1st year subjects.. But, watching videos will help you to recall or to understand concept very clearly.. But you cannot... read more

Dear jogendra, there are many websites and YouTube channels to teach medical subjects.. 

Medcramvideos channel gives complete medical course and doctor najeeb channel also teaches 1st year subjects.. 

But,  watching videos will help you to recall or to understand concept very clearly.. But you cannot reproduce it completely. Analysis and representation is different.. My advice is to read from text book twice and then see videos.. All the best for your bright future

 

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Answered on 26 Jul Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

Lakshmipathirao Reddy

Physiologist

you need to buy subject related books, surgery kit for dissection, apron . maintain individual books for each subject
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Answered on 12 Jul Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

Seenam K.

You can start government jobs.. Many options are in private sector but better to persue Ms or Md.
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Answered on 03 Sep Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

Ashutosh Singh

First try not to be panic about study. If you have reached this level you will surely land somewhere good only. Regarding subjects I suggest you to give more emphasis on anatomy. Read anatomy and revise by discussion. Read A K Jain physiology and biochemistry by Satyanarayan.
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Answered on 07 Sep Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

What is the fee structure for the whole duration of a 5-year MBBS?

Madan Krishna

Tutor

It depends on the seat categories, You please visit KEA site for fee details in Karnataka.. All the medical colleges have given their respective fees, for tuition and hostel also..
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Answered on 08 Aug Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

How do I prepare notes for MBBS 1st standard year?

Dr Bhaskar Gaonkar

Tutor

Hi Shantanu, As I feel, its better to prepare notes on daily basis according to the chapter covered on that day. For Biochemistry prepare essays point wise. Don't prepare in paragraphs. Let it be point by point. In case of metabolism just have a definition for the pathway in one sentence. Then mention... read more

Hi Shantanu,

As I feel, its better to prepare notes on daily basis according to the chapter covered on that day. For Biochemistry prepare essays point wise. Don't prepare in paragraphs. Let it be point by point. In case of metabolism just have a definition for the pathway in one sentence. Then mention cellular and subcellular sites. Then just draw the pathway. Don't have to give complete explanation. Even if you don't remember all the enzymes it's ok, but key enzymes of the pathway are IMP. in your notes as you draw the pathway, in that only just mark, inhibitors, activators of any enzymes, key enzymes, any special reactions such as substrate level phosphorylation, energetics etc. Then it's your responsibility to practice the pathways daily with those markings. For few days you can just look at the notes and practice. Once you are thorough it will automatically comes to your mind. 

Physiology is all concepts. So just fill your notes with flowcharts and practice. 

Anatomy is based on diagrams. (Refere Chaurasia's old editions as the diagrams are much simpler). If in book anything is not shown in diagrams but there in the explanation just put a circle triangle or some sort of marking to represent it and lable (don't draw them in exams. keep them just for your reference). Just every day practice the diagrams with that markings. Make the notes point wise. 

Hope this would help you. 

All the best

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Answered on 25 Aug Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

Which medical coaching is best in Delhi?

Akshay Kumar

Civil Engineer

AAKASH INSTITUTE
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Answered on 03 Sep Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

Which is the best Medical coaching in Allahabad?

Ashutosh Rawat

Learn high and get success.

I think Gurukul classes is best for medical coaching in Allahabad
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Answered on 28 Aug Tuition/MBBS & Medical Tuition Tuition/MBBS & Medical Tuition/Microbiology Exam Coaching/Medical Entrance Coaching +1 Tuition/MBBS & Medical Tuition/Biochemistry less

Which is the best medical coaching in Kolkata?

Arnab Nayak

Civil Engineer

Institute of Advanced Medical Studies Aakash Institute UNIQUE CLASSES | Institute For NEET UG | JEE | WBCS,IBPS ..Competitive Exams
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