Epithelial Root Sheath

Question 1. Hertwig’s root sheath.
Answer:

Epithelial cells of the inner and outer dental epithelium proliferate from the cervical loop of the enamel organ to form a double layer of cells known as Hertwig’s epithelial root sheath.
It consists of only inner and outer enamel epithelium.
Its inner epithelial cells initiate the differentiation of odontoblasts from ectomesenchymal cells to form dentin of the root.
The aim of this sheath encloses the primary apical foramen,
The remnants of this sheath are named epithelial pearls or enamel pearls.

“Understanding epithelial root sheath through FAQs: Structure, functions, and uses explained”

Question 2. Vestibular lamina.
Answer:

It results from the dividing of the primary epithelial band at around 7th week of intrauterine life,
It represents the buccal process of this band.
The vestibule forms as a result of the proliferation of the vestibular lamina into the ectomesenchyme.
Its cells rapidly enlarge and then degenerate to form a cleft that becomes the vestibule between the cheek and the tooth-bearing area.

“Importance of studying epithelial root sheath for dental students: Questions explained”

Question 3. Stratum intermedium.
Answer:

It is a layer of squamous cells present between the inner enamel epithelium and the stellate reticulum.
These cells are closely attached by desmosomes and gap junctions.
The well-developed cytoplasmic organelles, acid monopoly saccharides, and glycogen deposits indicate a high degree of metabolic activity.
It is essential for enamel formation.

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