Layer of cells that secrete enamel of tooth isa)Osteoblastb)Ameloblastc)Odontoblastd)DentoblastCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

In vertebrates, an odontoblast is a cell of neural crest origin that is part of the outer surface of the dental pulp, and whose biological function is dentinogenesis, which is the formation of dentine, the substance beneath the tooth enamel on the crown and the cementum on the root. Ameloblasts are cells present only during tooth development that deposit tooth enamel, which is the hard outermost layer of the tooth forming the surface of the crown. Osteoblast are cells with single nuclei that synthesize bone. However, in the process of bone formation, osteoblasts function in groups of connected cells. Dentoblast does not secrets enamel. Thus, option 'B' is correct.

Answer

Ameloblasts are cells present only during tooth development that deposit tooth enamel, which is the hard outermost layer of the tooth forming the surface of the crown.

Answer

Ameloblasts are cells which secrete the enamel proteins enamelin and amelogenin which will later mineralize to form enamel, the hardest substance in the human body.

Answer

The correct answer is option 'B' - Ameloblast.

Ameloblasts are a specific type of cells found in the layer of cells known as the ameloblastic layer. These cells are responsible for the formation and secretion of enamel, which is the hard, mineralized substance that covers the outer surface of teeth. Enamel is the hardest substance in the human body and plays a crucial role in protecting the underlying dentin and pulp of the tooth.

Function of Ameloblasts:
Ameloblasts are involved in the process of enamel formation, which occurs during tooth development. They have several important functions, including:

1. Secretion of Enamel Matrix: Ameloblasts secrete an organic matrix called enamel matrix or enamel proteins. This matrix contains proteins such as amelogenin, enamelin, and ameloblastin, which are essential for enamel formation.

2. Formation of Enamel Rods: Ameloblasts arrange the enamel proteins in a specific pattern, forming long, tightly packed structures called enamel rods or prisms. These rods provide the strength and durability to the enamel.

3. Mineralization of Enamel: Ameloblasts control the process of mineralization, which involves the deposition of calcium and phosphate ions onto the enamel matrix. They regulate the transport and incorporation of these minerals, resulting in the formation of hydroxyapatite crystals, the main mineral component of enamel.

4. Enamel Maturation: Ameloblasts participate in the maturation of enamel by removing the organic matrix and water content from the enamel rods. This process increases the mineral density and hardness of the enamel.

Location of Ameloblasts:
Ameloblasts are present in the enamel organ, which is a part of the tooth germ. The enamel organ consists of several layers, including the innermost layer called the stratum intermedium, the outer enamel epithelium, and the ameloblastic layer. Ameloblasts are specifically located in the ameloblastic layer, adjacent to the developing dentin.

In conclusion, ameloblasts are specialized cells that play a crucial role in the formation and secretion of enamel. They secrete enamel matrix, arrange it into enamel rods, regulate mineralization, and contribute to enamel maturation. Their location in the ameloblastic layer makes them the key cells involved in the development of enamel.

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