491. The dental sac gives rise to:
A.Cementoblasts and periodontal ligament.
B. Periodontal ligament and dental pulp.
C. Dental pulp and attachment epithelium.
D. Odontoblasts and Cementoblasts.
492. Which of the following is not a correct pairing of embryonic structure and adult derivative?
A.Maxillary processes: secondary palate.
B.Primary palate: upper incisor teeth.
C.Second pharyngeal arch: mandible.
D.Lateral lingual swellings: anterior 2/3 of tongue.
493.Which of the following are all derived from the stomodeal ectoderm?
A. Salivary glands, anterior pituitary gland and enamel organs.
B. Enamel dentin and major salivary glands.
C. Cementum, anterior pituitary gland and stratum intermedium.
D. Dental lamina, dental papilla and dental sac.
494. Which of the following does contribute to the formation of the upper lip?
A. Lateral nasal process.
B.Two maxillary processes & medial nasal process.
C. Medial nasal process.
D. First branchial arch.
495. The palatal shelves (palatine processes):
A. Are covered by endoderm.
B. Are derived from the primary palate.
C. Must assume a vertical position for palate closure to occur.
D. Are derived from the first branchial arch.
496. An oblique facial cleft is formed:
A.Due to the rupture of the buccopharyngeal membrane.
B.When the maxillary process fails to fuse with the mandibular processes.
C.When the maxillary process fails to fuse with the lateral & medialnasal process.
D. When the medial nasal process fails to fuse with the maxillary process.
497. The extrinsic muscles of the tongue:
A. Develop from the maxillary process.
B. Develop from occipital myotomes.
C. Develop from tuberculum impar.
D. Develop from the second branchial arch.
498. Which of the following embryonic structures contribute to the formation of lower lip:
A.Maxillary process.
B.Maxillary & medial nasal processes.
C.Medial & lateral nasal processes.
D. Two mandibular processes.
499. The tongue is not derived from:
A.Two lingual swellings.
B.Second branchial arch.
C.Third branchial arch.
D.Copula of His.
500. Palatine processes are derived from:
A.Maxillary processes.
B.Mandibular processes.
C.Copula of His.
D.Medial nasal process.
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