Embryo Final Practice Questions
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1. What is the fate of Meckel's Cartilage? A
A. Degenerates completely, to be replaced
by the mandible by membranous ossifica-
tion.
B. Degenerates partially, forming the prox-
imal end of the mandible by endochondral
ossification.
C. Provides additional support to the
mandible as it develops, and then degener-
ates.
D. Serves as the cartilaginous template for
the maxillary ossification.
E. Serves as the cartilaginous template for
the mandibular ossification.
2. A young patient presents with a cyst antero- A
lateral neck, just below the jaw. Which of
the following is a possible diagnosis and its
associated embryological defect?
A. Cervical/Pharyngeal Cyst: Pharyngeal
Arch II failed to grow over Pharyngeal Arch-
es III and IV
B. Cleft palate: Palate failed to fuse at the
midline
C. DiGeorge Syndrome: Failure of neural
crest cell migration
D. Edema secondary to poor lymphatic de-
velopment in the neck
E. Treacher-Collins Syndrome: Malforma-
tions of the structures formed by Pharyn-
geal Arches I and II
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3. A young patient presents with a small in- B
vagination of the skin on the anterolateral
neck, just below the jaw. The CT scan of
this patient indicates a cervical (pharyngeal)
cyst connected to it. What term describes
the invagination?
A. Ectopic thymus
B. External Branchial Fistula
C. Internal Branchial Fistula
D. Pharyngeal Cleft
E. Pharyngeal Pouch
4. A young patient presents with a cervical C
(pharyngeal) cyst. A CT scan of this patient
indicates a connection between the cyst
and the pharynx. What term describes the
connection?
A. Ectopic thymus
B. External Branchial Fistula
C. Internal Branchial Fistula
D. Pharyngeal Cleft
E. Pharyngeal Pouch
5. Which of the following correctly numbers E
the pharyngeal arches in humans? Pharyngeal Arch 5 does not form in hu-
A. 1, 2, 3, 4, 5 mans.
B. 1, 3, 4, 5, 6
C. 1, 2, 4, 5, 6
D. 1, 2, 3, 5, 6
E. 1, 2, 3, 4, 6
6.
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Which statement is correct? B
A. Pharyngeal clefts form internally be- A is incorrect because it is the opposite of
tween arches while pharyngeal pouches the correct answer. C is incorrect because
form externally. Pharyngeal Arch II grows over Pharyngeal
B. Pharyngeal clefts form externally be- Clefts II-IV, obliterating them, while Pha-
tween arches while pharyngeal pouches ryngeal Cleft I is maintained. D is incorrect
form internally. because the ear is formed across Pharyn-
C. Pharyngeal Arch I grows over Pharyngeal geal Cleft I, intervening mesenchyme, and
Clefts I-IV, obliterating them. Pharyngeal Pouch I.
D. The ear is formed across Pharyngeal Cleft
II, intervening mesenchyme, and Pharyn-
geal Pouch I.
7. Each pharyngeal arch has all of the follow- E
ing associated with it, EXCEPT: Each pharyngeal arch has an associat-
A. Aortic Arch/Artery ed aortic arch (artery), cartilaginous rod,
B. Cranial Nerve muscular components, cranial nerve, en-
C. Cartilaginous Rods dodermal and ectodermal linings
D. Endodermal and Ectodermal Linings
E. Lymphatics
8. Which is statement is TRUE? A
A. If a muscular component of a pharyngeal
arch migrates, it takes its innervation with
it.
B. If a muscular component of a pharyngeal
arch migrates, its innervation degenerates
and is replaced at its destination.
C. If a muscular component of a pharyngeal
arch migrates, only its attachment changes.
Its origin remains at the first location.
D. Muscular components of pharyngeal
, Embryo Final Practice Questions
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arches acquire their innervation at their
destination.
9. Name the three components of the auditory 1. External Auditory Meatus: Pharyngeal
canal and their pharyngeal origins. Cleft I
2. Tympanic Membrane: Intervening
Mesenchyme
3. Auditory Tube: Pharyngeal Pouch I
10. Which of the following describes part of the D
gag reflex pathway?
A. Afferent: Facial Nerve; Efferent: Superior
Laryngeal Part of Vagus Nerve
B. Afferent: Recurrent Laryngeal Part of
Vagus Nerve; Efferent: Glossopharyngeal
Nerve
C. Afferent: Glossopharyngeal Nerve; Effer-
ent: Trigeminal Nerve
D. Afferent: Glossopharyngeal Nerve; Ef-
ferent: Superior Laryngeal Part of Vagus
Nerve
E. Afferent: Superior Laryngeal Part of Va-
gus Nerve; Efferent: Facial Nerve
11. Which statement is TRUE? A
A. The malleus and incus arise from Pha-
ryngeal Arch I while the stapes arises from
Pharyngeal Arch II.
B. The malleus and stapes arise from Pha-
ryngeal Arch I while the incus arises from
Pharyngeal Arch II.
C. The incus and stapes arise from Pharyn-
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1. What is the fate of Meckel's Cartilage? A
A. Degenerates completely, to be replaced
by the mandible by membranous ossifica-
tion.
B. Degenerates partially, forming the prox-
imal end of the mandible by endochondral
ossification.
C. Provides additional support to the
mandible as it develops, and then degener-
ates.
D. Serves as the cartilaginous template for
the maxillary ossification.
E. Serves as the cartilaginous template for
the mandibular ossification.
2. A young patient presents with a cyst antero- A
lateral neck, just below the jaw. Which of
the following is a possible diagnosis and its
associated embryological defect?
A. Cervical/Pharyngeal Cyst: Pharyngeal
Arch II failed to grow over Pharyngeal Arch-
es III and IV
B. Cleft palate: Palate failed to fuse at the
midline
C. DiGeorge Syndrome: Failure of neural
crest cell migration
D. Edema secondary to poor lymphatic de-
velopment in the neck
E. Treacher-Collins Syndrome: Malforma-
tions of the structures formed by Pharyn-
geal Arches I and II
, Embryo Final Practice Questions
Study online at https://quizlet.com/_3tgxev
3. A young patient presents with a small in- B
vagination of the skin on the anterolateral
neck, just below the jaw. The CT scan of
this patient indicates a cervical (pharyngeal)
cyst connected to it. What term describes
the invagination?
A. Ectopic thymus
B. External Branchial Fistula
C. Internal Branchial Fistula
D. Pharyngeal Cleft
E. Pharyngeal Pouch
4. A young patient presents with a cervical C
(pharyngeal) cyst. A CT scan of this patient
indicates a connection between the cyst
and the pharynx. What term describes the
connection?
A. Ectopic thymus
B. External Branchial Fistula
C. Internal Branchial Fistula
D. Pharyngeal Cleft
E. Pharyngeal Pouch
5. Which of the following correctly numbers E
the pharyngeal arches in humans? Pharyngeal Arch 5 does not form in hu-
A. 1, 2, 3, 4, 5 mans.
B. 1, 3, 4, 5, 6
C. 1, 2, 4, 5, 6
D. 1, 2, 3, 5, 6
E. 1, 2, 3, 4, 6
6.
, Embryo Final Practice Questions
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Which statement is correct? B
A. Pharyngeal clefts form internally be- A is incorrect because it is the opposite of
tween arches while pharyngeal pouches the correct answer. C is incorrect because
form externally. Pharyngeal Arch II grows over Pharyngeal
B. Pharyngeal clefts form externally be- Clefts II-IV, obliterating them, while Pha-
tween arches while pharyngeal pouches ryngeal Cleft I is maintained. D is incorrect
form internally. because the ear is formed across Pharyn-
C. Pharyngeal Arch I grows over Pharyngeal geal Cleft I, intervening mesenchyme, and
Clefts I-IV, obliterating them. Pharyngeal Pouch I.
D. The ear is formed across Pharyngeal Cleft
II, intervening mesenchyme, and Pharyn-
geal Pouch I.
7. Each pharyngeal arch has all of the follow- E
ing associated with it, EXCEPT: Each pharyngeal arch has an associat-
A. Aortic Arch/Artery ed aortic arch (artery), cartilaginous rod,
B. Cranial Nerve muscular components, cranial nerve, en-
C. Cartilaginous Rods dodermal and ectodermal linings
D. Endodermal and Ectodermal Linings
E. Lymphatics
8. Which is statement is TRUE? A
A. If a muscular component of a pharyngeal
arch migrates, it takes its innervation with
it.
B. If a muscular component of a pharyngeal
arch migrates, its innervation degenerates
and is replaced at its destination.
C. If a muscular component of a pharyngeal
arch migrates, only its attachment changes.
Its origin remains at the first location.
D. Muscular components of pharyngeal
, Embryo Final Practice Questions
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arches acquire their innervation at their
destination.
9. Name the three components of the auditory 1. External Auditory Meatus: Pharyngeal
canal and their pharyngeal origins. Cleft I
2. Tympanic Membrane: Intervening
Mesenchyme
3. Auditory Tube: Pharyngeal Pouch I
10. Which of the following describes part of the D
gag reflex pathway?
A. Afferent: Facial Nerve; Efferent: Superior
Laryngeal Part of Vagus Nerve
B. Afferent: Recurrent Laryngeal Part of
Vagus Nerve; Efferent: Glossopharyngeal
Nerve
C. Afferent: Glossopharyngeal Nerve; Effer-
ent: Trigeminal Nerve
D. Afferent: Glossopharyngeal Nerve; Ef-
ferent: Superior Laryngeal Part of Vagus
Nerve
E. Afferent: Superior Laryngeal Part of Va-
gus Nerve; Efferent: Facial Nerve
11. Which statement is TRUE? A
A. The malleus and incus arise from Pha-
ryngeal Arch I while the stapes arises from
Pharyngeal Arch II.
B. The malleus and stapes arise from Pha-
ryngeal Arch I while the incus arises from
Pharyngeal Arch II.
C. The incus and stapes arise from Pharyn-
