NBDE Part 1 - Dental Anatomy and Occlusion UPDATED
ACTUAL Questions and CORRECT Answers
Which suprahyoid muscle are innervated by the facial = Posterior Digastric and Stylohyoid
nerve?
Infrahyoid Muscles = DEPRESSORS of the larynx and the hyoid bone
1. Omohyoid (Ana Cervicalis, C1-C3)
2. Sternohyoid (Ana Cervicalis, C1-C3)
3. Sternothyroid (Ana Cervicalis, C1-C3)
4. Thyrohyoid (Ventral Ramus of C1 via Hypoglossal)
Which dental tissue most closely resembles bone? = CEMENTUM
- Cementum has COLLAGEN fibers and CELLULAR COMPONENTS
(Cementocytes)
- have Acellular and Cellular cementum
- Cementoid is laid down first
Extrinsic Tongue Muscles 1. Genioglossus (Hypoglossal)
2. Hyoglossus (Hypoglossal)
3. Styloglossus (Hypoglossal)
4. Palatoglossus (VAGUS NERVE)
, Intrinsic Tongue Muscles 1. Superior Longitudinal
2. Inferior Longitudinal
3. Transverse Muscle
4. Vertical Muscle
**All of these are innervated by the HYPOGLOSSAL NERVE****
Muscles of the Mouth/Facial Expression = are innervated by the six branches of the Facial Nerve
- Posterior muscles = Posterior Auricular
- Anterior Muscles = 5 branches of the PAROTID PLEXUS (Temporal, Zygomatic,
Buccal, Mandibular, Cervical)
When there's injury to the mandible (i.e., malignancy), to = TO THE SIDE OF INJURY
which side will it deviate? = if the hypoglossal nerve becomes damaged, the tongue will deviate TOWARD
the affected side
muscles of mastication are innervated by Mandibular Division of the Trigeminal Nerve (V3)
When the condylar head is fractured, what keeps it in the = Temporomandibular Ligament
mandibular fossa?
What muscle contracts during lateral excursive = the one lateral pterygoid muscle from the OPPOSITE SIDE
movements? - so if the patient is moving their mandible to the right, the LEFT LATERAL
PTERYGOID is what contracts
Gemination and fusion occur during which stage of tooth = CAP STAGE (9-10th week)
development?
- Dens in dente and Tubercle formation also occur during this time
- Proliferation, differentiation, and morphogenesis
Anodontia and Supernumerary teeth are a result of the = INITIATION (6-7 week of gestation)
interruption of which phase? - Proliferation
During what stage does Macrodontia and Microdontia = BELL STAGE (11-12th week)
occur? - Histodifferentiation and Morphodifferentiation
During what stage does Enamel Dysplasia, = APPOSITION (varies per tooth)
Concrescence, and Enamel Pearls occur?
ACTUAL Questions and CORRECT Answers
Which suprahyoid muscle are innervated by the facial = Posterior Digastric and Stylohyoid
nerve?
Infrahyoid Muscles = DEPRESSORS of the larynx and the hyoid bone
1. Omohyoid (Ana Cervicalis, C1-C3)
2. Sternohyoid (Ana Cervicalis, C1-C3)
3. Sternothyroid (Ana Cervicalis, C1-C3)
4. Thyrohyoid (Ventral Ramus of C1 via Hypoglossal)
Which dental tissue most closely resembles bone? = CEMENTUM
- Cementum has COLLAGEN fibers and CELLULAR COMPONENTS
(Cementocytes)
- have Acellular and Cellular cementum
- Cementoid is laid down first
Extrinsic Tongue Muscles 1. Genioglossus (Hypoglossal)
2. Hyoglossus (Hypoglossal)
3. Styloglossus (Hypoglossal)
4. Palatoglossus (VAGUS NERVE)
, Intrinsic Tongue Muscles 1. Superior Longitudinal
2. Inferior Longitudinal
3. Transverse Muscle
4. Vertical Muscle
**All of these are innervated by the HYPOGLOSSAL NERVE****
Muscles of the Mouth/Facial Expression = are innervated by the six branches of the Facial Nerve
- Posterior muscles = Posterior Auricular
- Anterior Muscles = 5 branches of the PAROTID PLEXUS (Temporal, Zygomatic,
Buccal, Mandibular, Cervical)
When there's injury to the mandible (i.e., malignancy), to = TO THE SIDE OF INJURY
which side will it deviate? = if the hypoglossal nerve becomes damaged, the tongue will deviate TOWARD
the affected side
muscles of mastication are innervated by Mandibular Division of the Trigeminal Nerve (V3)
When the condylar head is fractured, what keeps it in the = Temporomandibular Ligament
mandibular fossa?
What muscle contracts during lateral excursive = the one lateral pterygoid muscle from the OPPOSITE SIDE
movements? - so if the patient is moving their mandible to the right, the LEFT LATERAL
PTERYGOID is what contracts
Gemination and fusion occur during which stage of tooth = CAP STAGE (9-10th week)
development?
- Dens in dente and Tubercle formation also occur during this time
- Proliferation, differentiation, and morphogenesis
Anodontia and Supernumerary teeth are a result of the = INITIATION (6-7 week of gestation)
interruption of which phase? - Proliferation
During what stage does Macrodontia and Microdontia = BELL STAGE (11-12th week)
occur? - Histodifferentiation and Morphodifferentiation
During what stage does Enamel Dysplasia, = APPOSITION (varies per tooth)
Concrescence, and Enamel Pearls occur?
