Malignant sgts represent 6% of head and neck cancers and 0. Sialolithiasis of the minor salivary glands is relatively rare, and the peak incidence is later than that of the submandibular gland and is in the fifth to eighth decades. The sections show a stratified squamous epithelium with a thin layer of parakeratosis, minor salivary glands, and a wellcircumscribed cystic lesion. It is located below the external acoustic meatus between the ramus of the mandible and the ster. Salivary gland infarction was found in two adult dogs. Salivary gland tumors sgts are rare neoplasms accounting for 0. Newly described salivary gland tumors modern pathology. The major salivary glands consist of the parotid, submandibular, and sublingual glands. Malignant salivary gland tumours represent about 5% of all head and neck cancers, with a slight predominance in men 54,55.
The acquisition of tissue and histological interpretation is variable and needs to be standardised for use in clinical trials. Salivary gland tumours or neoplasms are tumours that form in the tissues of salivary glands. Salivary gland, any of the organs that secrete saliva, a substance that moistens and softens food, into the oral cavity of vertebrates. Cydnidae is an agricultural pest feeding on roots of several crops. Sebaceous glands are attached to parotid and submandibular ducts and are considered part of normal holocrine differentiation holocrine secretions are produced within the cell, then are released into the lumen after rupture of the plasma membrane, based on the occurrence of salivary tumors with sebaceous differentiation.
Interstitial lymphocytes give rise to the formation of lymph nodes in the parotid gland. The oral cavity is lined by a mucous membrane the oral mucosa consisting of a stratified squamous epithelium, which may or may not be keratinized, and an underlying connective tissue layer, the lamina propria. Histological evaluation of the salivary gland biopsy the importance given to the histological examination of the salivary gland biopsy in both diagnostic criteria sets has prompted the pharmaceutical industry to use salivary gland histology as outcome measure in clinical trials. Medical school histology basics liver, gallbladder. Choose from 500 different sets of salivary gland histology flashcards on quizlet. Parotid salivary gland, 40x there are nine images on this pagethree magnifications each of the three types of salivary glands parotid, submandibular, and sublingual. Be able to identify striated ducts of the salivary gland at the light and electron microscope level and correlate the structural features of the constituent cells to the. Serous cells significantly outnumber the mucous cells pale staining. Numerous small glands situated in the mucous membrane lips. The two parotid glands are major salivary glands wrapped around the mandibular ramus in humans. The smallest ducts, which are embedded in the secretory tissue intralobular ducts, are lined by cuboidal or columnar epithelia. The surface is kept moist with mucus produced by the major and numerous minor salivary glands.
Basement membrane protein perlecan hspg2 heparan sulfate proteoglycan 2 triggers differentiation of salivary gland cells into self assembling acinilike structures that express essential biomarkers and secrete alpha amylase tissue eng part a 2009. Parotid gland the parotid gland is composed mainly of serous cells and produces saliva that is watery and rich in enzymes amylase and lysozyme and antibodies. Individual secretory acini are drained by intercalated ducts and join striated ducts. Anatomy and histology of rodent and human major salivary glands. Histopathology of the salivary glands springerlink. The parotid gland is the largest of all the salivary glands and weighs about 1530 g. The cystic lesion has a mildly fibrotic appearing wall, is lined by histiocytes intermixed with rare lymphocytes, and contains mucous and macrophages. Robert lewis maynard, noel downes, in anatomy and histology of the laboratory rat in toxicology and biomedical research, 2019. The functional unit of the salivary glands is the terminal secretory piece called acini with a roughly spherical or tubular shape.
The salivary system has a pair of principal salivary glands and a pair of accessory salivary glands. Salivary gland tumors an update american society for. Heterotopic salivary tissue is found in many locations throughout the head and neck. The abundant serous exocrine cells make up the bulk of the gland. Mucus is a thick, clear, and somewhat slimy substance. Endothelial cell regulation of salivary gland epithelial patterning. Compound glands are typically fairly bulky and contain very many individual secretory units acini or. Parotid glands submandibular glands sublingual glands 3. The salivary gland possesses tubuloacinar units, and these are merocrine. Salivary glands and pancreas are familiar examples.
Salivary glands may be predominantly serous, mucous, or mixed in secretion. Salivary glands are made up of secretory acini acini means a rounded secretory unit and ducts. A simple gland has an unbranched duct or no duct at all. This book is a comprehensive guide to salivary gland pathology that illustrates almost every type of salivary gland tumor and will assist greatly in routine diagnostic work. Saliva is a fluid secreted by the salivary glands that keeps the oral cavity moist and also coats the teeth along with mucosa.
Several epithelial types are found in the duct system of the parotid. There is only a single secretory unit acinus or tubule. Invasive tumor, often aggressive, with glandular or ductal differentiation but no features characteristic of other specific types arch pathol lab med 2004. The parotid gland is a serous gland, pinkish in colour, divided into several lobes further subdivided into lobules, which can be seen as small discrete areas subdividing the surface of the gland. This could be particularly important for aggressive salivary gland tumors, such as salivary duct carcinoma sdc. The aetiology of the salivary gland tumour is mainly described by the multicellular theory, by which each cell type can give rise to a. It is the serous type of gland which secretes alphaamylase also known as ptyalin. A modified european league against rheumatism consensus guideline development. Treuting, in comparative anatomy and histology second edition, 2018. The principal salivary gland is bilobed with anterior and posterior lobes joined by a. Depending on the particular salivary gland, these acini are lined by variable combinations of mucous and serous epithelial cells surrounded by myoepithelial cells, located between the basal plasma membrane and the acinar basement membrane. The largest of these three are the parotid glands, which are located in front and just beneath the ears.
Standardisation of labial salivary gland histopathology in. Still in the us, carcinomas of the major salivary glands comprise 11% of oropharyngeal neoplasms. Nonneoplastic lesions, benign epithelial tumors, malignant epithelial tumors, and nonepithelial and secondary tumors are all covered in detail, and the who and tnm. The acini can either be serous, mucous, or a mixture of serous and mucous. Pdf anatomy, histology, and ultrastructure of salivary. Ageinduced variations and reactive changes include oncocyte proliferation, fatty infiltration, squamous and. Examples include sweat glands, gastric glands, intestinal crypts, and uterine glands a compound gland has a branching duct. Physiology, pathology and regeneration of salivary glands. The histology and ultrastructure of the salivary glands of s. Major salivary glands are characterized by the presence of numerous excretory units that consist of acini and a peculiar duct system. The burrower bug scaptocoris castanea perty, 1830 hemiptera. There are two types of secretions serous and mucous.1502 1527 709 865 1140 655 265 1001 319 1119 1372 992 178 436 784 1006 815 1089 623 1390 1445 26 425 900 911 1121 862 929 92 364