Unit III - Maxilla

Question 1

What are the 5 parts of the maxilla?

Answer 1

body

zygomatic process

frontal process

alveolar process

palatine process

Question 2

What are the 5 parts of the body of the maxilla?

Answer 2

anterior surface

infratemporal surface (tuberosity)

orbital surface

nasal surface

maxillary sinus (hiatus)

Question 3

What attaches to the anterior surface of the body of the maxilla?

Answer 3

nasalis muscle

attachment: maxilla lateral and inferior to the nasal notch –> bridge and ala of nose
function: transverse fibers compress and alar fibers widen the nasal aperature
innervation: facial n. (buccal branch)
blood supply: lateral nasal, angular and infraorbital a.

Question 4

What are the 6 parts of the anterior surface of the body of the maxilla?

Answer 4

incisive fossa

canine eminence

canine fossa

infraorbital margin

infraorbital foramen

anterior nasal spine

Question 5

What attaches to the canine fossa?

Answer 5

levator anguli oris muscle

attachment: canine fossa of maxilla –> angle of mouth
function: raises angle of mouth
innervation: facial n. (buccal and zygomatic branches)
blood supply: facial, superior labial and infraorbital a.

Question 6

What attaches to the infraorbital margin?

Answer 6

(1) levator labii superioris muscle
attachment: infraorbital orbital margin –> lateral aspect of upper lip
function: raises and everts upper lip
innervation: facial n. (buccal and zygomatic branches)
blood supply: facial, angular and infraorbital a.

(2) orbicularis oculi muscle
attachment: orbital margin and medial palpebral ligament –> superficial fascia of eyelid
function: palpebral sphincter
innervation: facial n. (temporal and zygomatic branches)
blood supply: superficial temporal, lacrimal, supraorbital, supratrochlear, dorsal nasal, angular, infraorbital, and transverse facial a.

Question 7

What is the function of the infraorbital foramen?

Answer 7

transmits the infraorbital n., a., and v.

Question 8

What is the name and function of the canals of the infratemporal surface (tuberosity)

Answer 8

alveolar; transmits the superior alveolar n., a., v.

Question 9

What attaches to the orbital surface of the body of the maxilla?

Answer 9

inferior oblique muscle

attachment: maxilla lateral to the nasolacrimal groove –> inferolateral, posterior aspect of the sclera
function: elevation, abduction and extorsion of the eye
innervation: inferior ramus of the oculomotor n.
blood supply: ophthalmic and infraorbital a.

Question 10

What is the name and function of the groove and canal of the orbital surface of the body of the maxilla?

Answer 10

infraorbital groove and canal; transmits the infraorbital n., a., v.

Question 11

What are the 2 parts of the nasal surface of the body of the maxilla?

Answer 11

greater palatine canal

nasolacrimal canal

Question 12

What is the function of the greater palatine canal?

Answer 12

transmits the greater palatine n., a., v.

Question 13

What is the function of the nasolacrimal canal?

Answer 13

transmits the nasolacrimal duct

Question 14

What is the name and what attaches to the crest of the frontal process of the body of the maxilla?

Answer 14

Anterior lacrimal crest; medial palpebral ligament

Question 15

What is the function of the alveolar process?

Answer 15

houses roots of upper teeth?

Question 16

What attaches to the alveolar process?

Answer 16

buccinator muscle

attachment: alveolar processes of maxilla and mandible, pterygoid hamulus and pterygomandibular raphe –> buccal angle
function: compresses cheek
innervation: facial n. (buccal branch)

Question 17

What is the name and function of the fossa of the palatine process of the maxilla?

Answer 17

incisive fossa; transmits the nasopalatine n., a, and greater palatine a.