Anatomy

Question 1

What are the 4 muscles of mastication?

Answer 1

Masseter
Temporalis
Medial pyterygoid
Lateral pyterygoid

Question 2

What is the function of the masseter?

Answer 2

Elevate mandible, closes jaw

Question 3

Where do the masseter muscles lie?

Answer 3

Zygomatic arch to ramus and angle of mandible

Question 4

Function of the temporalis?

Answer 4

Elevates mandible and retracts jaw

Question 5

Where do the temporalis muscles lie?

Answer 5

Temporal bone to coronoid process and ramus

Question 6

Function of lateral pyterygoid

Answer 6

Open jaw, mandible forwards and downwards

Question 7

Where do lateral pyterygoid run

Answer 7

Small head -sphenoid bone to disc of TMJ

Large head- lateral pyterygoid plate - pyterygoid fovea

Question 8

Function of medial pyterygoid

Answer 8

Closes jaw - elevates mandible pulls it forward

Question 9

Name 3 facial muscles

Answer 9

Buccinator - cheek
Oris- Mouth
Frontalis- forehead

Question 10

What are the functions of the tongue

Answer 10

Speech, taste,mastication and swallowing

Question 11

What are the tongue intrinsic muscles

Answer 11

Inside, bundles, alter the shape

Question 12

what are the tongue extrinsic muscles

Answer 12

Outside, move tongue around alter position

Question 13

5 Effects of tongue on developing dentition

Answer 13

Tongue pressure can result in
lisp
AOB
pro clination of upper incisors
Fwd tongue posture can obstruct eruption
Large tongue ( macroglossia) can delay eruption

Question 14

What is the basal bone in the maxilla

Answer 14

Stable, defines skeletal pattern

Question 15

What is alveolar bone

Answer 15

Dependent on existing teeth and is remodelled as teeth move.

Extracting teeth causes loss of alveolar bone

Question 16

How does maxilla grow

Answer 16

Foetus ossification of bone
Filling in of sutures
Drift
Periosteal remodelling

Question 17

What age does maxilla growth stop for girls and boys

Answer 17

Girls 15 Boys 17

Question 18

How does mandible grow

Answer 18

Foetus 6 weeks mandible ossifies
Age 2, two halves fuse
Body length increases, apposition,deposition
Vertical growth
Periosteal activity

Question 19

What age does mandibular bone growth stop in girls and boys

Answer 19

Girls 17

Boys 19

Question 20

Where and when do growth rotations occur

Answer 20

mandible, puberty

Question 21

What is a forward growth rotation

Answer 21

Favorable
Increased posterior FH > anterior FH
Well balanced face proportions
Increased overbite

Question 22

What is a backward growth rotation

Answer 22

Unfavorable
Decreased posterior FH < anterior FH
Reduced overbite
AOB

Question 23

Last teeth to erupt in maxillary arch other than 2 an 3rd molars

Answer 23

Upper 3 an Upper 5

Question 24

Last teeth to erupt in mandibular arch other than 2 an 3rd molars

Answer 24

Lower 5s

Question 25

What age is a maxillary canine favorably palapable

Answer 25

9-10 its visible age 11