Question

4 Zones of Coronal pulp

A) Pulp chamber, odontoblastic layer, cell-free zone, pulp horn
B) Pulp core, fibrous matrix, vascular network, dentin interface
C) Inner pulp, outer pulp, pulp horns, coronal plexus
D) Odontoblastic region, avascular zone, cell-rich area, pulp chamber

Answer 1

The coronal pulp of a tooth can be organized into four zones: the odontoblastic layer, cell-free zone, cell-rich area, and pulp core, each having distinct functions and cellular components that contribute to the vitality and sensitivity of the tooth.

Step-by-step explanation:

Zones of Coronal Pulp

The coronal pulp of a tooth is the part of the pulp found within the crown, and it is structurally organized into zones. It is crucial for the nourishment and sensitivity of the tooth. The coronal pulp can be broadly divided into four zones:

1. Odontoblastic layer: This is the outermost layer of the pulp adjacent to the dentin, consisting of odontoblasts which are cells that produce dentin.
2. Cell-free zone (Zone of Weil): Located just beneath the odontoblastic layer, this zone contains fewer cells but is rich in nerve fibers and capillaries.
3. Cell-rich zone: Inward from the cell-free zone, this region has an increased density of cells including fibroblasts, undifferentiated mesenchymal cells, and defensive cells.
4. Pulp core: This is the central part of the pulp, composed of a fibrous matrix along with large blood vessels and nerve tissue.

These zones ensure that the tooth stays vital and can respond to physical stimuli and potential injury. Aside from these zones, the pulp chamber is the larger space in the coronal pulp that extends to the pulp horns, which are the extensions beneath the cusps of the teeth.