Epithelial glands II Flashcards
1
Q
Structure of a Compound Gland
A
- consists of epithelial cells lining both the duct system(excretory ducts) and secretory units arising as a sruface invagination into vascularized connectie tissue
- The ducts persists, the gland is classified as an exocrine gland
- Duct does not persist, the gland is classified as an endocrine gland and the secretory units secrete into capillaries
- compound gland is a multicellular gland divided into subunits called lobules
- Each lobule is equivalent to a simple branched gland
- Secretory units of the lobule may be tubular,alveolar(acinar) or tubuloalveolar(-acinar)
2
Q
Parenchyma vsStroma
A
- Components of the gland derived from epithelium(secretory units and ducts) comprise the parenchyma
- Connective tissue capsule surrounding the entire gland as well as the connective tissue partitions separating the loules and lobes comprise the stroma
3
Q
Stroma
A
- Entire gland is typically surrounded by a connective capsule
- Septa(trabeculae) are extensions of the capusle into hte epithelial components of the gland that divide the gland into subdivisions called lobes and lobules
4
Q
Lobe
A
- subivision of a compound gland separated from adjacent lobes by septae
5
Q
Lobules
A
- Lobule is a subdivision of a lobe
- Lobules are separated from each other by delicate septae
- each lobule is equivalent to a simple , branched gland
6
Q
Acinus
A
- Acini are secretory componets of a lobule
- Acini may be serous , mucous , or sero-mucous(mixed)
- Basement membrane covers the outer surface of the acinus
- Myoepithelial cells are found between the basement membrane and the secretory cells of the acinus
- Myoepithelial cells are derived from epithelium but are charecterized by extensive actin bundles resulting in contractility
- MYopethelial cells help to express the secretions of acini into the intercalated ducts
7
Q
Intralobular ducts(2 types of ducts)
A
- Intralobular ducts are duct that lie within a lobule
- there are two types of intralobular ducts
- intercalated ducts:
- drain the secretory acini
- lined by simple squamos epithlium transitioning to low cuboidal epithelium
- involved in bicarbonate/chloride ion exchange
- Striated duct
- Lined by cuboidal epithelium transitioning to columnar epithelium with basal striations(for active transport)
- Active reabsorb sodium ions; passively reabsorb chloride ions;actively secrete potassium ions
- intercalated ducts:
8
Q
Interlobular ducts:
A
- Formed by the confluence of two ro mroe striated ducts and are found in the septae between adjacent lobules
- interlobular ducts are lined with pseudostratified columnar epithelium
9
Q
Intralobar ducts:
A
- Intralobar ducts are joined by the confluence of two or more interlobular ducts
- Intralobar dcuts are lined with colunar epithelium transitioning into stratified columnar epithelium
10
Q
Lobar duct
A
- They are formed by the confluence of two or more intralobar ducts
- Lobar ducts are lined with stratifed columnar epithelium
11
Q
Where are minor salivary glands located?
A
- Located thoughout the oral cavity and include
- Von Evner’s glands, labial galdns , palatal glands and buccal glands
- these glands keep the sruface of the oral cavity moist
12
Q
Major salivary glands
A
- Parotid glands
- The parotid glands are composed only of serous acini
- Submandibular glands:
- The submandibular glands are mixed glands with both mucous and serous acini, but the serous acini are predominant
- Serous secretory cells form a crescent-shaped configuration around the mucous acini;these are called serous demilunes
- Sublingual glands:
- Sublingual glands are alos mied glands, but the mucous acini are predominat
13
Q
A
Parotid Gland 400x
14
Q
A
Parotid Gland
15
Q
A
Sublingual gland
16
Q
A
Sublingual gland 400x
17
Q
A
Submandibular gland
18
Q
A
Parotid Gland
19
Q
A
Parotid Gland
20
Q
A
Submandibular gland 100x
21
Q
A
Submandibular gland
22
Q
A
Mammary gland
23
Q
A
Mammary Gland
