Branchial Arches

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Questions and Answers

Branchial Arches, select one:

  • Each have their own nerve supply (correct)
  • All share a common blood supply
  • Have derivatives for all 6 arches
  • Are made of ectoderm, mesoderm and endoderm

Derivatives of the ectoderm include: select one or more:

  • Enamel (correct)
  • Skeleton
  • Skin (correct)
  • Muscles

During embryology the blastocyst:

  • Is a solid ball of cells that forms from cleavage of the zygote
  • Is a fluid filled ball of cells that forms after formation of the morula (correct)
  • Is a solid ball of cells that forms from cleavage of the morula
  • Is a fluid filled ball of cells that forms after fertilisation of the zygote

Neural crest cells give rise to :

<p>Ectomesenchyme and connective tissue in the head (B)</p> Signup and view all the answers

Select the correct answer regarding the development of the tongue:

<p>The tongue is innervated by the glossopharyngeal nerve and the trigeminal nerve (A)</p> Signup and view all the answers

The branchial arch does NOT give rise to any structures:

<p>I (A), V (D)</p> Signup and view all the answers

The branchial arches innervated by the glossopharyngeal nerve (cranial nerve IX) are:

<p>III (B)</p> Signup and view all the answers

The derivatives of these branchial arches are innervated by the trigeminal nerve (cranial nerve V):

<p>I (A)</p> Signup and view all the answers

The development of the face begins in:

<p>Week 4 (B)</p> Signup and view all the answers

The development of the secondary palate:

<p>Creates the barrier between the oral and nasal cavities (D)</p> Signup and view all the answers

The face begins to form form which processes:

<p>Frontonasal (D)</p> Signup and view all the answers

The muscular derivatives of these branchial arches are the muscles of facial expression:

<p>II (D)</p> Signup and view all the answers

The philtrum forms:

<p>From fusion of the maxillary and medial nasal processes (A)</p> Signup and view all the answers

The three layers of the embryonic trilaminar disc are:

<p>Ectoderm, mesoderm and endoderm (C)</p> Signup and view all the answers

Which branchial arches give rise to the mandible:

<p>I (A)</p> Signup and view all the answers

Which branchial arches give rise to the palatine tonsils:

<p>None of the above (D)</p> Signup and view all the answers

Cleft palate is a developmental anomalie that results from:

<p>The failure of fusion of the palatine shelves together and the nasal septum (C), The failure of fusion of the two medial nasal processes and the maxillary processes (D)</p> Signup and view all the answers

During childhood development, at age 4, environmental factors such as too much fluoride, can disrupt the amelogenesis process for permanent teeth

<p>True (B)</p> Signup and view all the answers

Ameloblasts form conical projections called Tomes Processes during which of the following stages of amelogenesis:

<p>Secretory (A)</p> Signup and view all the answers

Differentiation of ameloblasts from pre-ameloblasts takes place in which of the following stages of tooth development:

<p>Bell state (C)</p> Signup and view all the answers

Enamel, gingiva and the skin are direct derivatives of the ectoderm

<p>True (A)</p> Signup and view all the answers

During amelogenesis which cellular layer of the enamel organ collapses to allow space for the ameloblasts:

<p>Stellate reticulum (C)</p> Signup and view all the answers

During feral development, amelogenesis for all primary teeth is complete before birth:

<p>True (A)</p> Signup and view all the answers

During Odontogenesis, the dental sac gives rise to:

<p>The supporting structures of the teeth (C)</p> Signup and view all the answers

Cleft palate develops when there is a failure of fusion of which structures?

<p>The palatine shelves together and the nasal septum (B)</p> Signup and view all the answers

Odontogenesis starts with the following cellular laters at its initiation stage:

<p>Ectomesenchyme and oral epithelium (B)</p> Signup and view all the answers

Select the correct answer regarding the development of the tongue:

<p>The tongue is innervated by the glossopharyngeal nerve and the trigeminal nerve (D)</p> Signup and view all the answers

Select the single best answer:

<p>The stellate reticulum plays a key role in amelogenesis by providing nutrients to the ameloblasts (B)</p> Signup and view all the answers

Select the single best answer:

<p>All oral tissues originate from the ectoderm and the ectomesenchyme (neural crest cells) (A)</p> Signup and view all the answers

The 2 stages of amelogenesis and dentinogenesis can be described as:

<p>All of the above (D)</p> Signup and view all the answers

Flashcards

Branchial Arches

Each branchial arch has its own nerve supply.

Ectoderm Derivatives

Enamel is derived from the ectoderm.

Blastocyst

A fluid-filled ball of cells that forms after formation of the morula.

Neural Crest Cells

These cells give rise to ectomesenchyme and connective tissue in the head.

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Tongue Innervation

The tongue is innervated by the glossopharyngeal and trigeminal nerves.

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Branchial Arch I

Branchial arch I does NOT give rise to any structures

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Branchial Arch III Nerve

Branchial arch III is innervated by the glossopharyngeal nerve (cranial nerve IX).

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Branchial Arch I Nerve

The derivatives of branchial arch I are innervated by the trigeminal nerve (cranial nerve V).

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Facial Development

The face begins to form in week 4 of development.

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Secondary Palate

The secondary palate creates the barrier between the oral and nasal cavities.

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Facial Processes

The face begins to form from the frontonasal process.

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Branchial Arch II Muscles

The muscular derivatives of branchial arch II are the muscles of facial expression.

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Philtrum Formation

The philtrum forms from the fusion of the maxillary and medial nasal processes.

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Embryonic Trilaminar Disc

Ectoderm, mesoderm, and endoderm are the three layers.

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Mandible Origin

Branchial arch I gives rise to the mandible.

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Palatine Tonsil Origin

The palatine tonsils do NOT originate from the branchial arches.

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Cleft Palate Cause

Cleft palate results from failure of fusion of the palatine shelves and nasal septum.

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Fluoride disruption to Amelogenesis

True

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Tomes Processes

Secretory is the stage of Amelogenesis, when ameloblasts form conical projections called Tomes Processes

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Ameloblast Differentiation

Bell stage is when differentiation of ameloblasts from pre-ameloblasts takes place during tooth development

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Ectoderm Derivatives

True

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Stellate Reticulum Role

Stellate reticulum collapses to allow space for the ameloblasts during amelogenesis

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Primary Tooth Amelogenesis

True

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Dental Sac

The dental sac gives rise to the supporting structures of the teeth.

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Cleft Palate Development

Failure of fusion of the palatine shelves together and the nasal septum

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Odontogenesis Initiation

Ectomesenchyme and oral epithelium are the cellular layers

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Tongue Innervation

The tongue is innervated by the glossopharyngeal nerve and the trigeminal nerve

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Stellate Reticulum in Amelogenesis

The stellate reticulum plays a key role in amelogenesis by providing nutrients to the ameloblasts.

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Origin of Oral Tissues

All oral tissues originate from the ectoderm and the ectomesenchyme (neural crest cells).

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