411. The enamel cord
A. Is an extension of the dental lamina.
B.Is an extension of the outer dental epithelium.
C. Is an extension of successional dental lamina
D.Extends from the stratum intermedium to the stellate reticulum.

412.Dental follicle cells
A. Differentiate into the ameloblast layer.
B. Differentiate into the odontoblast layer.
C. Are found within the dental organ.
D. Migrate to dentin surface of the root and differentiate into the cementoblast.

413. All of the following is the functions of The Stellate Reticulum except:
A. Keep Space for The enamel development.
B. Act as a reservoir for nutritive materials.
C. Act as a cushioned to protect ameloblasts.
D. Secretes alkaline phosphatase enzyme.

414. The epithelial root sheath of Hertwig disintegrates:
A. After odontoblastic differentiation & before dentin matrix formation.
B. After odontoblastic differentiation & dentin matrix deposition.
C. Before odontoblastic differentiation.
D. After cementum formation.

415. All of the following is a function of dental sac except:
A. Nutrition of enamel organ.
B. Formation of cementum.
C. Formation of periodontal ligament.
D. Formation of supporting alveolar bone.

416. The lateral dental lamina gives rise to:
A. Deciduous teeth .
B. Permanent successors.
C. Permanent molars.
D. Vestibular lamina.

417. The stratum intermedium:
A. Lies between outer enamel epithelium & stellate reticulum.
B. Is a transient structure.
C. Is rich in mucopolysaccharides.
D. Plays important role in enamel calcification.

418. The down growth of an epithelial thickening buccal to the dental lamina is known as:
A. Vestibular lamina.
B.Linguo-alveolar Sulcus.
C. Lateral dental lamina.
D. Successional dental lamina.

419. The dental lamina is induced to proliferate into a tooth bud by the:
A. Basement membrane.
B. Nerve endings.
C.Ecto-mesenchyme.
D. Oral epithelium.

420. Calcified tissues of the tooth are derived from:
A. Ectoderm only.
B. Endoderm only.
C. Mesoderm only.
D. Ectoderm & Mesoderm.

NOTE
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