salivary gland power point

The oral region includes the lips, palate, teeth and associated structures, tongue, major salivary
glands, and lingual tonsil. It is lined in most places by a stratified squamous epithelium whose
epithelial ridges interdigitate with tall connective tissue papillae (connective tissue ridges) of
the subjacent connective tissue. The epithelial ridges and the connective tissue ridges are
known collectively as the rete apparatus. The epithelium and connective tissue together form
the mucosa. The oral cavity has three types of mucosae: lining mucosa, whose epithelium is
nonkeratinized; masticatory mucosa, whose epithelium is keratinized; and specialized mucosa,
whose nonkeratinized stratified squamous epithelium possesses taste buds. The dorsal surface
of the tongue, hard palate, and gingivae are the only regions that possess masticatory
mucosa; the dorsum of the tongue, soft palate, and regions of the pharynx possess specialized
mucosa; the remainder of the oral cavity is lined by lining mucosa.
A. The lips are divided into the external (skin) region, the vermilion zone, and the internal
(mucosal) region. The first two regions are covered by stratified squamous keratinized epithelium,
whereas the internal region is lined by a wet stratified squamous nonkeratinized
epithelium.
1. A dense irregular connective tissue core envelops skeletal muscle.
2. Sebaceous glands, sweat glands, and hair follicles are present in the external region; minor
salivary glands in the internal region; and occasional, nonfunctional sebaceous glands
(known as Fordyce’s granules) in the internal region and vermilion zone.
B. The palate is divided into an anterior hard palate (possessing a bony shelf in its core) and a
posterior soft palate (possessing skeletal muscle in its core). The palate separates the nasal
cavity from the oral cavity. Therefore, the palate has a nasal aspect and an oral aspect. The
entire nasal aspect of the palate (with the exception of the uvula) is lined by pseudostratified
ciliated columnar epithelium (respiratory epithelium