Mandible Movement and Trigeminal Nerve

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Questions and Answers

What is the primary function of the Medial Pterygoid muscle?

Elevation of the mandible (correct)

Rotation of the mandible

Protraction of the mandible

Side to side movement of the mandible

Which nerve branch is responsible for the sensation of pain in the face?

Ophthalmic nerve

Maxillary nerve

Mandibular nerve

All of the above (correct)

What is the action of the Lateral Pterygoid muscle on the mandible?

Elevation

Side to side movement (correct)

Protraction

Depression

Which muscle is not primarily responsible for the movement of the mandible?

Tongue Signup and view all the answers

What is the name of the nerve that supplies the muscles of mastication?

Trigeminal nerve Signup and view all the answers

Which nerve supplies the muscles of mastication?

Mandibular Nerve Signup and view all the answers

Which muscle of mastication depresses the mandible?

Lateral Pterygoid Signup and view all the answers

Which of the following muscles of mastication does not protrude the mandible?

Temporalis Signup and view all the answers

What is the origin of the Temporalis muscle?

Infra-temporal fossa Signup and view all the answers

Which branch of the trigeminal nerve is responsible for carrying sensory information from the maxillary region?

Maxillary Nerve Signup and view all the answers

Which muscle is responsible for elevation of the mandible?

Temporalis muscle Signup and view all the answers

Which nerve supplies the Temporalis muscle?

Deep Temporal Nerves Signup and view all the answers

Which of the following muscles is NOT involved in protraction of the mandible?

Temporalis muscle Signup and view all the answers

What is the insertion point of the Lateral Pterygoid muscle?

Fovea in front of the head of the mandible Signup and view all the answers

Which of the following muscles is responsible for depression of the mandible?

Lateral Pterygoid muscle Signup and view all the answers

What is the origin point of the Medial Pterygoid muscle?

Maxillary tuberosity and medial surface of the lateral pterygoid plate Signup and view all the answers

Which nerve branch supplies the Masseter muscle?

Anterior division of the mandibular nerve Signup and view all the answers

Which of the following muscles has a superficial and deep head?

Masseter muscle Signup and view all the answers

Study Notes

Muscles of Mastication

There are 4 muscles of mastication:
- Temporalis
- Masseter
- Lateral Pterygoid
- Medial Pterygoid

Temporalis Muscle

Origin:
- Deep head: from the floor of the temporal fossa
- Superficial head: from the temporal fascia
Insertion:
- Medial surface of the coronoid process
- Anterior border
- Tip
Nerve supply:
- Deep temporal nerves
Action:
- Elevation of the mandible
- Retraction of the mandible

Masseter Muscle

Origin:
- Lower border and inner surface of the zygomatic arch
Insertion:
- Lateral surface of the ramus of the mandible
Action:
- Elevation of the mandible
- Protraction of the mandible
Nerve supply:
- Trigeminal nerve (mandibular nerve)

Lateral Pterygoid Muscle

Origin:
- Upper head: from the infratemporal crest of the greater wing of the sphenoid
- Lower head: from the lateral surface of the lateral pterygoid plate
Insertion:
- Fovea in front of the head of the mandible
Action:
- Protraction of the mandible
- Depression of the mandible
- Side to side movement
Nerve supply:
- Anterior division of the mandibular nerve

Medial Pterygoid Muscle

Origin:
- Superficial head: from the maxillary tuberosity
- Deep head: from the medial surface of the lateral pterygoid plate
Insertion:
- Medial surface of the mandible
Action:
- Elevation of the mandible
- Side to side movement
Nerve supply:
- Trigeminal nerve (mandibular nerve)

Trigeminal Nerve

Also known as the fifth cranial nerve
Emerges from the side of the pons
Has a large sensory root and a small motor root
Crosses the apex of the petrous temporal bone beneath the superior petrosal sinus
Enters the middle cranial fossa
Chief sensory nerve for the face and head
Has sensations of pain, temperature, and touch
Motor action on muscles of mastication

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Description

This quiz covers the anatomy and function of the mandible, including the muscles involved in its movement and the nerve supply of the trigeminal nerve.