DENT 1020 Oral Embryology (Ch. 3, 4, 5) Flashcards
Which embryologic layer do the somites come from? A) Ectoderm B) Mesoderm C) Endoderm D) All of the above
B) Mesoderm
Which cranial nerve innervates the fungiform papilla and is responsible for taste sensation? A) Trigeminal (5) B) Vagus (10) C) Facial (7) D) Glossopharyngeal (9)
C) Facial (7)
The primitive streak is oriented in which direction? A) Horizontal B) Cephalic/Coronal C) Midsagittal D) Transverse
C) Midsagittal
Which of the following is true of meiosis?
A) It is a type of cell division that produces two identical daughter cells
B) It results in a diploid number of chromosomes
C) It occurs in reproductive organs
D) It results in cells with 46 chromosomes
C) It occurs in reproductive organs
Which of the following is the correct order from superior to inferior of the developing embryo in the bilaminar disk stage?
A) Amniotic, epiblast, hypoblast, yolk sac
B) Yolk sac, epiblast, hypoblast, amniotic
C) Amniotic, hypoblast, yolk sac, epiblast
D) Amniotic, epiblast, yolk sac, hypoblast
A) Amniotic, epiblast, hypoblast, yolk sac
TRUE or FALSE
The mandible forms in the 1st branchial arch.
True
From which embryonic layer is mesoderm derived A) Epiblast layer B) Hypoblast layer C) Endoderm D) Neuroectoderm
A) Epiblast layer
The first branchial GROOVE will eventually form which structure? A) The auditory tube B) The external auditory meatus C) The middle ear bones D) All of the above
B) The external auditory meatus
Which nerve controls the movement of the intrinsic (internal) muscles of the tongue? A) Trigeminal B) Facial C) Hypoglossal D) Glossopharyngeal E) Vagus
C) Hypoglossal
Of the following events, which one comes first? A) Beginning of tooth formation B) Primary palate formation C) Beginning of tongue formation D) Secondary palate formation
C) Beginning of tongue formation
The tubercle of the upper lip is formed from which embryologic process? A) Medial nasal processes B) Maxomandibular process C) Mandibular D) None of the above
A) Medial nasal processes
During which week of prenatal development is the palate completed? A) 5th B) 8th C) 10th D) 12th
D) 12th
The primitive streak forms in the embryonic disk, causing:
A) Initiation of palatal development
B) Bilateral symmetry
C) Fusion of the mandibular processes
D) Disintegration of the oropharyngeal membrane
E) Creation of a second embryonic layer
B) Bilateral symmetry
Which of the following pairs does NOT represent a true embryonic relationship? A) Epiblast -> Ectoderm B) Hypoblast -> Endoderm C) Ectoderm -> Enamel D) Hypoblast -> Mesenchyme
D) Hypoblast -> Mesenchyme
After the embryonic disk folds into itself, it is shaped like a hollow tube. The inner part of the developing embryo will form the: A) Stomodeum B) Digestive tract C) Frontal process D) First branchial arch E) Buccopharyngeal membrane
B) Digestive tract
The stomodeum or "primitive mouth" of the embryo forms the: A) Anterior portion of the tongue B) Buccopharyngeal membrane C) Nasal and oral cavities D) Frontal process E) Premaxilla
C) Nasal and oral cavities
Which of the following do the medial nasal processes NOT form? A) Intermaxillary segment B) Philtrum C) Tubercle D) Alae E) None of the above
D) Alae
Cheeks are formed: A) From the hypobranchial eminence B) By fusion of the maxillary and mandibular processes C) From the copula D) From the tuberculum impar
B) By fusion of the maxillary and mandibular processes
A common type of cleft lip can result from the lack of fusion between:
A) Mandibular and maxillary processes
B) Medial nasal and maxillary processes
C) Lateral nasal and medial nasal processes
D) Lateral nasal and maxillary processes
B) Medial nasal and maxillary processes
The mandible and most of the maxilla are formed by the: A) Frontal process B) Globular process C) First branchial arch D) Buccopharyngeal membrane E) Second and third branchial arches
C) First branchial arch
Neural crest cells migrate from which embryonic structure(s)? A) Stomodeum B) First Branchial arch C) Neural folds D) Frontonasal process E) Hypoblast layer
C) Neural folds
The BODY of the tongue is formed mainly by the:
A) Central tubercle (tuberculum Impar) of the second branchial arch
B) Lateral lingual swellings (lateral tubercles) of the first branchial arch
C) Second, third, and fourth branchial arches
D) Second branchial arch only
E) third branchial arch only
B) Lateral lingual swellings (lateral tubercles) of the first branchial arch
Which of the following phrases concerning the second branchial arch is correct?
A) It is called the mandibular arch
B) It contains Reichert’s cartilage
C) It forms into the muscles of mastication
D) It is associated with the trigeminal nerve
B) It contains Reichert’s cartilage
The thyroid gland has a common origin with the tongue, forming initially at the center of the 1st and 2nd branchial arches and then moving to its final position in the pharynx (throat). The depression left in the posterior part of the mature tongue where the thyroid gland formed is called: A) Copula B) Sulcus terminalis C) Foramen cecum D) Central tubercle E) Thyroglossal duct
C) Foramen cecum
TRUE or FALSE
The intermaxillary segment gives rise to the secondary palate.
False
TRUE or FALSE
The triangular median swelling, the tuberculum impar, is formed from the fusion of mesenchyme from mainly the third and parts of the fourth branshial arches.
False
The premaxilla contains tooth buds of the:
A) Incisors
B) Incisors and canines
C) Incisors, canines, and premolars
D) Incisors, canines, premolars, and molars
A) Incisors
Which of the following structures separates the stomodeum from the foregut? A) Third arch cartilage B) Cervical sinus C) Reichert's cartilage D) Meckel's cartilage E) Buccopharyngeal membrane
E) Buccopharyngeal membrane
The first indication of tongue development is seen as a medial elevation known as the: A) Copula B) Tuberculum impar C) Lingual notch D) Sulcus terminalis
B) Tuberculum impar
TRUE or FALSE
A cleft lip is more common and more severe in males, more commonly unilateral, and on the left side.
True
