week 14 prosection vids anatomy

What nerve innervates all muscles of mastication?

Mandibular division of trigeminal nerve (CN V3)

(Masseter, Temporalis, Medial and Lateral Pterygoids)

What nerve provides sensory innervation to the face?

Trigeminal nerve (CN V), via V1, V2, and V3

• V1 = Forehead, upper eyelids, bridge of nose

• V2 = Cheeks, lower eyelids, upper lip

• V3 = Lower lip, chin, jaw, temple

What nerve innervates the anterior 2/3 of the tongue with general sensory?

Lingual nerve (CN V3)

What nerve provides taste to the anterior 2/3 of the tongue?

Chorda tympani (branch of facial nerve, CN VII)

What nerve innervates the parotid gland parasympathetically?

Lesser petrosal nerve (CN IX via otic ganglion), fibers hitchhike on auriculotemporal nerve (V3)

What is the one muscle of mastication that depresses the mandible?

Lateral pterygoid (All others elevate)

Which muscles are innervated by CN V3 but are not muscles of mastication?

• Mylohyoid

• Anterior belly of digastric

Which nerve has a unique loop around the middle meningeal artery?

Auriculotemporal nerve (V3)

Which cranial nerve carries both parasympathetic and special sensory (taste) fibers to the tongue?

Chorda tympani (CN VII)

• Carries taste to anterior 2/3

• Carries parasympathetics to submandibular and sublingual glands

What is the action of depressor anguli oris?

Depresses the angle (corner) of the mouth.

What is the action of levator labii superioris?

Elevates the upper lip

What is the action of orbicularis oris?

Closes and purses the lips (sphincter muscle of the mouth)

What is the action of frontalis?

Raises eyebrows and wrinkles the forehead.

What is the action of zygomaticus major?

Retracts the angle of the mouth (as in smiling).

What is the action of levator anguli oris?

Elevates the corner of the mouth

What is the action of the temporalis muscle?

Elevates and retracts the mandible.

What is the action of the masseter muscle?

Elevates and protrudes the mandible.

What is the action of the medial pterygoid muscle?

Elevates and protrudes the mandible.

What is the action of the lateral pterygoid muscle?

Depresses and protrudes the mandible

What is the origin of the temporalis muscle?

Temporal fossa

What is the insertion of the temporalis muscle?

Coronoid process of the mandible

What is the origin of the masseter muscle?

Zygomatic arch

What is the insertion of the masseter muscle?

Angle of the mandible

What is the origin of the lateral pterygoid muscle?

Lateral aspect of the lateral pterygoid plate (sphenoid bone)

What is the insertion of the lateral pterygoid muscle?

Temporomandibular joint capsule

What is the origin of the medial pterygoid muscle?

Medial aspect of the lateral pterygoid plate

What is the insertion of the medial pterygoid muscle?

Medial surface of the mandible

What is the origin of the zygomaticus major?

Zygomatic bone

What is the insertion of the zygomaticus major?

Angle of the mouth