What is the stellate reticulum?
A tissue layer lying between the stratum intermedium and the outer enamel epithelium. It consists of star-shaped cells which protect the underlying dental tissues and maintain the shape of the tooth. From: stellate reticulum in A Dictionary of Dentistry »
What is the main function of stellate reticulum?
Description. The stellate reticulum is comprised of loosely arranged, angular epithelial cells occupying the central portion of the enamel organ in the cap and bell stages. The stellate reticulum cushions the inner enamel epithelium and provides nourishment to adjacent cells.
What is the difference between pituitary adenoma and craniopharyngioma?
However, pituitary adenomas and craniopharyngiomas differ from each other, as follows: 1) pituitary adenomas are the third most common type of intracranial tumor and represent a significant proportion of brain tumors affecting humans and approximately 80% of sellar lesions, whereas craniopharyngiomas represent only 1 …
What is Adamantinomatous Craniopharyngioma?
Adamantinomatous craniopharyngioma is a histologically benign, partially cystic epithelial neoplasm of the suprasellar or sellar region, resembling ameloblastoma or keratinizing and calcifying odontogenic cyst.
What is the origin of stellate reticulum?
Stellate Reticulum Cells (DnCr) Stellate reticulum cells are derived from the suprabasal layers of the oral ectoderm. These cells are formed during the bud stage.
When does the stellate reticulum collapse?
The stellate reticulum is lost after the first layer of enamel is laid down. This brings cells in the inner enamel epithelium closer to blood vessels at the periphery.
Where are Ameloblasts located?
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.
Can stress cause pituitary tumors?
There are reliable research studies showing severe stress, childhood trauma, and/or physical trauma increase the likelihood of the development of a pituitary tumor. There are, of course, many people who experience such events and do not develop pituitary or other endocrine disorders.
Does craniopharyngioma enhance?
(Rule of ninety in adamantinomatous craniopharyngioma: 90% are solid-cystic, 90% calcify and 90% enhance). These tumors have a predilection to being large, extending superiorly into the third ventricle, encasing vessels and even adhering to adjacent structures 4.
What is the most reliable indicator of periodontal disease?
While tooth loss is a reliable indicator of gum disease, patients can benefit from advanced periodontal services when they exhibit milder symptoms as well. Gingivitis, a condition characterized by seemingly harmless symptoms like bad breath and bleeding gums, is the first stage of gum disease.
What do ameloblasts do?
Function. 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. Ameloblasts control ionic and organic compositions of enamel.
Which is a nodule of the stellate reticulum?
Palisading , “wet” keratin , and stellate reticulum are key features of adamantinomatous craniopharyngioma. Palisading is present in papillary craniopharyngioma, but is not as developed as in the adamantinomatous lesion. A nodule of anuclear “ghost” cells termed “wet” keratin lies in the stellate reticulum. The combination is diagnostic.
What kind of theory is used for papillary craniopharyngioma?
While an “embryogenetic” theory currently is used to explain the origin of adamantinomatous craniopharyngiomas, a “metaplastic” theory of tumorigenesis has been suggested for the papillary variant.
What kind of keratin is found in craniopharyngioma?
Accumulations of eosinophilic “wet” keratin are a hallmark of craniopharyngioma and in some cases may dominate the histological picture.
What kind of tumor is a craniopharyngioma?
Craniopharyngioma has been defined by the World Health Organization (WHO) as “a benign, partially cystic epithelial tumor of the sellar region, presumably derived from Rathke pouch epithelium” ( Rushing et al., 2007 ).