Facial Development and Cranial Sutures
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Questions and Answers

Which part of the face is mainly formed from the first pharyngeal arch?

  • Frontal bone
  • Maxilla (correct)
  • Zygomatic bone
  • Nasal bone
  • At what age do facial sutures typically start to fuse in humans?

  • Infancy
  • Adulthood
  • Teenage years
  • 7th - 8th decades (correct)
  • Which process of the first pharyngeal arch gives rise to the mandible?

  • Hyoid process
  • Maxillary process
  • Mandibular process (correct)
  • Frontonasal process
  • What bones form the viscero-cranium that consists of the face?

    <p>Maxilla and zygomatic bone</p> Signup and view all the answers

    During which stage of life does the eruption of primary dentition enlarge the facial skeleton?

    <p>Infancy</p> Signup and view all the answers

    Which part of the skull undergoes two different forms of ossification, endochondral and intramembranous?

    <p>Cranium</p> Signup and view all the answers

    What is the significance of the region just dorsal to the second pharyngeal cleft?

    <p>Developing inner ear</p> Signup and view all the answers

    Which genes are crucial during the development of the first pharyngeal arch?

    <p>MSX1, MSX2, DLX2</p> Signup and view all the answers

    What signaling pathway is responsible for driving the patterning of the mandible?

    <p>EDN1/EDNRA</p> Signup and view all the answers

    Which gene activity is the first pharyngeal arch devoid of?

    <p>HOX gene activity</p> Signup and view all the answers

    What determines the identity of the cranial neural crest that migrates to form the 1st pharyngeal arch?

    <p>Antagonistic signaling mechanisms of BMP and FGF</p> Signup and view all the answers

    Which pharyngeal cleft is just dorsal to the developing inner ear?

    <p>Second</p> Signup and view all the answers

    Which signaling pathways control facial formation?

    <p>BMP, FGF, and SHH</p> Signup and view all the answers

    What shifts in blood supply occur during facial development?

    <p>Internal to external carotid artery</p> Signup and view all the answers

    Which nerve supplies the mucosa of the posterior third of the tongue?

    <p>Glossopharyngeal nerve (IX)</p> Signup and view all the answers

    Which embryonic period category includes genetically determined developmental defects?

    <p>Malformations</p> Signup and view all the answers

    What is necessary for fusion of the palatine shelves to occur?

    <p>Elimination of the epithelial covering of the shelves</p> Signup and view all the answers

    What happens as the two palatine shelves meet during fusion?

    <p>Adhesion of the epithelia occurs, forming a midline epithelial seam</p> Signup and view all the answers

    What causes surface epithelial cells to be sloughed off during palate fusion?

    <p>Apoptosis</p> Signup and view all the answers

    What happens to the midline seam to permit ectomesenchymal continuity between fused processes?

    <p>It must be removed</p> Signup and view all the answers

    What does Meckel's cartilage develop into in the inner ear?

    <p>Malleus</p> Signup and view all the answers

    Which secondary cartilage mainly occupies the developing ramus of the mandible?

    <p>Condylar cartilage</p> Signup and view all the answers

    At what stage does intramembranous ossification begin in the mandible?

    <p>At 7 weeks</p> Signup and view all the answers

    What contributes considerably to the development of the maxilla for a short period of time?

    <p>Zygomatic (malar) cartilage</p> Signup and view all the answers

    Which nerve division is closely associated with the center of ossification in both the mandible and maxilla?

    <p>Trigeminal nerve division</p> Signup and view all the answers

    Which structure is entirely independent of the Meckel's cartilage in contributing to jaw development?

    <p>Symphyseal cartilage</p> Signup and view all the answers

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