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Oral/Dental Anatomy

41 important questions on Oral/Dental Anatomy

Superior Orbital Fissure of Sphenoid Bone

Trigeminal Nerve (V1)
First Division (Ophthalmic)

Foramen Ovale of Sphenoid Bone

Trigeminal Nerve (V3)
Third Division (Mandibular)

Cranial Nerve I Olfactory

sensory
sense of smell

Cranial Nerve II Optic

Sensory
Sense of Sight

Cranial Nerve III Oculomotor

Motor
Eye muslces, pupil, lens

Cranial Nerve IV Trochlear

Motor
Eye muscles

Cranial Nerve V Trigeminal

Both sensory and motor
Opthalmic, Maxillary, &Mandibular Divisions

Cranial Nerve VI Abducens

Motor
Eye muscles

Cranial Nerve VII Facial

Both sensory and motor
muscles of facial expression, taste, sublingal and submandibular salivary glands

Cranial Nerve VIII Vestibulocochlear

Sensory
Sense of Balance and Hearing

Cranial Nerve IX Glossopharyngeal

Both sensory and motor
taste and sensation for the posterior of tongue and parasympathetic innervation to the Parotid Gland

Cranial Nerve X Vagus

both sensory and motor
smooth muscles and glands of the body, cardiac muscle

Trigeminal Nerve V1 Opthalmic

sensory
leaves through superior orbital fissure of sphenoid bone
tip of nose, eyes, forehead

Trigeminal Nerve V2 Maxillary

sensory
leaves through foramen rotundum of sphenoid bone
upper teeth, nose, palate, mouth, cheek and temporal region

Trigeminal Nerve V3 Mandibular

sensory and motor
leaves through foramen ovale of sphenoid bone
enters mandible foramen
includes muscles of mastication, and lower teeth

Medial Pterygoid OIF

origin- medial surface of lateral pterygoid plate and mazillary tuberosity
insertion- inner surface of the angle of the mandible
function- elevate and protrude the mandible

Lateral Pterygoid OIF

origin- lateral surface of the lateral pterygoid plate and infratemporal surface of the sphenoid bone
insertion- TMJ disc and neck of the mandibular condyle
function- protrude and/or depress the mandible and allow the side to side shift of the mandible

Blood flow from the heart to the head

aorta
right side: brachiocephalic artery
left side: common carotid
right and left common carotids branch;
internal carotid: skull, eye, brain
external carotid: everything else

Blood flow to oral and facial structures

external carotid artery
Maxillary: teeth, muscles of mastication, ear
Lingual: tongue, floor of mouth
Facial: muscles of facial expression, lips, eyelids, soft palate, throat

Deep Cervical Nodes

submandibular nodes, 3rd molars and wall of the throat and oropharynx

Frontal process builds what?

starts developing at week 3 of embryonic stage
forehead and frontal bone
median nasal process
        center and tip of nose
        nasal septum
        globular process
lateral nasal process
       sides of nose
       infraorbital area

First Brachial Arch builds what?

starts developing at week 3 of embryonic stage
maxillary process
       lateral palatine processes
       upper parts of cheek
       sides of upper lip
mandibular process
       lower jaw
       lower parts of the face and lower lip
      anterior 2/3 of the tongue

Initiation (Bud Stage)

starts here
dental lamina grows in 20 spaces for primary teeth

Proliferation (Cap Stage)

Grows here
enamel organ develops from the dental lamina
dental papilla arises and produces pulp and dentin
dental sac around the developing tooth becomes cementum, PDL and alveolar bone

Differentiation (Bell Stage)

specializes develop here
enamel organ develops into 4 layers

Oral mucosa tissue

stratified sqramous epithelial layer and connective tissue lamina

Masticatory mucosal tissue

keratinized
protects attached gingiva and hard palate

Lining mucosal tissue

not keratinized
alveolar, vestivular and bucal mucosa, and floor of the mouth

Specialized mucosal tissue is where

tongue

Tooth with longest root

maxillary canine

Cuspid most common with bifurcated root

mandibular

Tooth most often fails to develop

third molar or maxillary lateral

Non-functional lingual cusp

mandibular first premolar

Tooth most likely to have 2 root canals

mandibular first molat

Tooth most likely to have lingual caries

maxillary lateral incisor

Mandibular first molar strongest root

mesial is widest and strongest

Tooth with tendency to have divergent roots

maxillary first molar

Most unique anatomy tooth

primary first mandibular molar

First deciduous incisors erupt at

6 months

Primary dentition (20 teeth) complete by

30 months, begins formation at 6 weeks in utero

Permanent tooth erupts about

6 years, usually the first molar
mixed dentition stage lasts through age 12-13

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NBDHE

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