24. What is the modiolus? What are the structures that insert into the modiolus?

25. What is the structure that supplies motor innervation to the muscles of facial expression?

26. What is the structure that supplies arterial blood supply to the muscles of facial expression?

27. What is the definition of mastication? What are the muscles of mastication? What cranial nerve is responsible for innervation of these?

Expert Solution

A24) Modiolus is the fibromuscular nod, bluntly cone shaped present in the cheeks also known as muscular node.

Structures that are inserted into the modiolus are:

Buccinator
Zygomaticus Major
Orbicularis oculi
Risorius
Levator Labii Superioris
Levator Labii Inferioris
Levator Angular Oris
Depressor Anguli Oris

A25) The motor nerve that supplies muscles that are responsible for facial expression is facial nerve.

Facial nerve is a cranial nerve that supplies major part of face and neck. It has 5 terminal branches which pierces parotid gland to enter face.

A26) The artery that supplies muscles a facial expression facial artery.
A27) Mastication is chewing of food in the mouth. It is the process in which food is grinded and crushed by teeth.
Muscles That helps in mastication are:

Masseter muscle
Temporalis muscle
Lateral pterygoid
Medial pterygoid

These muscles are supplied by mandibular nerve. It is the terminal branch of Trigeminal nerve .

gladiator answered 3 years ago

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