Muscles of Mastication

Question 1

Masseter Muscle

Location
Region
Origin
Insertion
Action

Answer 1

Location: Superficial cheek
Region: cheek

Origin: Superficial Head- zygomatic process 
Deep head- zygomatic arch

Insertion: Superficial Head- angle of mandible
deep head- ramus

Action: Elevation of mandible
closing the jaw

Question 2

Temporalis Muscle

Location
Region
Origin
Insertion
Action

Answer 2

Location: temporal bone
Region: temple
Origin: temporal fossa
Insertion: coronoid process of mandible
Action: Elevation/ retraction of mandible 
allows space between teeth (freeway space)

Question 3

Medial Pterygoid

Location
Region
Origin
Insertion
Action

Answer 3

Location: Below lateral along ramus
Region: spheniod

Origin: Deep- pterygoid fossa
superficial- maxilla

Insertion: Ramus/ angle of mandible
Action: Elevates mandible

Question 4

Lateral Pterygoid

Location
Region
Origin
Insertion
Action

Answer 4

Location: In front of ear
Region: sphenoid

Origin: Superior- sphenoid bone 
inferior- lateral pterygoid plate

Insertion: Mandibular condyle
Action: Side to side movement, protrusion