Histology of the oral caviity Flashcards
The functions of the oral cavity
speech
breathing
facial expression
sensory perception
mechanical and chemical digestion
What is mastication??
The process by which ingestion food os made suitable for swallowing.
The oral cavity is mainly comprised by what/ of what?
Lips, teeth, tongue, and oral mucosa.
saliva is compressed of what ?
is mainly compressed of water and small proportion of electrolytes and proteins.
Which component of saliva protect the oral cavity from infections?
IgA protein
function of the watery saliva
moistens and lubricates the mastication process while salivary mucus helps bind the bolus ready for swallowing.
what membrane lines the oral cavity?
protective mucous membrane- ORAL MUCOSA that sensory receptors for taste.
what type of the epithelium layer lines the palate/
has stratified squamous epithelium which is keratinized in some regions, such as the palate, due to increased friction.
also the GINGIVA
they are keratinized to protect the underlying tissues from mechanical forces and toxins
Throughout the oral mucosa is numerous small…………?
accessory salivary glands- serous and mucosa glands.
3 surfaces of the lip
External surface- hair-bearing skin.
vermilion border- pinkish-red transitional zone of the lip, and derives its colour from the rich vascular dermis which only has a thin lightly keratinized epidermal covering here.
oral mucosa- covering the inner surface of the lip. has stratified squomous epithelium.
A muscular organ covered by oral mucosa and has necessary reception for tase and general sensation.
Tongue
The body of the tongue consist of what
mass of interlacing buddles of skeletal muscle fibers.
Mucous membrane covering the tongue is firmly bound to the underlying muscle via what
dense collagenous lamina propria which is continuous with the epimysium of the tongue muscle.
why lamina proper take large mass of area?
to ensure thr tongue is fully functionally
Filiform papillae consist of
a dense supporting tissue core and a heavily keratinized surface projection.
Fungiform papillae have ?
a thin non-keratinized epithelium and a richly vascularized supporting tissue core which gives a red appearance macroscopically.
papillae that is set into tongue surface and encircled by a deep cleft?
circumvallate papillae.
Aggregations of serous glands –von Ebner glands open into what?
to the base of the circumvallate cleft and secrete a watery fluid that dissolves food constituents thereby facilitating taste reception.
The posterior one-third of the tongue is lined by ?
a smooth stratifeid squamous epithelium
The lymphoid tissues contains what
lymphoid follicles.
All of the lymphoid tissue contributes to what is known as the
Lingual tonsils
what form the waldeyers ring of lymphoid tissues
lingual, palatine and pharyngeal(adenoids) tonsils
what penetrate the lingual tonsils and also found on palatine tonsils
Epithelium Crypts
Secretory unit of the Salivary gland
Consists of tubulo-acinar structure composed entirely of serous or mucous secretory cells, or a mixture of both.
In mixed type where the mucous cells predominate the serous cells form semilunar caps called?
Serous demilunes
Intercalated ducts drains into
striated ducts
The nuclei of mucous cells
are condensed and characteristically located at the base of the cell
CElls the forces secretion from the acinar lumen to the duct system
myoepithelium cells
Contractile cells found in both mucous and serous glands
myoepithelium cells
These cells are located between
the basal plasma membranes of secretory cells and the basement membrane
a condensed nuclei aids ?
to increase surface area for secretion and support contractile fuction
Gland is divide into what?
lobules, each containing secretory units
Connective tissue………….A) between lobules from an outer caspule and convey blood vessels, nerves and large ……….B)
A.- septa radiate
B- excretory ducts
Parotid gland mainly consist of ?
serous secretory glands that are dark stained
granules found on serous gland
Zymogen glands
which are cytoplasmic granules containing proteins.
A large excretory duct lined by stratified cuboidal epithelium is present in the fibrous tissue septum and is accompanied by blood vessels and nerves
Sublingual gland
This gland contains occasional adipocytes which is a feature found in older individuals
submandibular gland
Consists of a mixture of serous and mucous secretory units –usually in the form of mixed secretory units.
However, pure serous and pure mucous units are also found.
Mixed secretory units consist of mucous acini with serous demilunes.
