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Wk 3: Histology CH 11 Orofacial Structures
Terms in this set (17)
Exocrine gland vs. Endrocine gland
Exocrine- has ducts to release secretion (ie. salivary gland)
Endocrine- has NO ducts; secretes hormones directly into blood stream
What is the largest endocrine gland
Please see picture in Week 3 Histo
-what's the middle section that connects 2 lobes called?
-what hormone does it secrete
-Where is it located
-what is a capsule
-what separates them?
-What are the lobules and what are they composed of it?
-What are follicles?
-What is colloid?
-middle section is called isthmus
-located below the larynx and in front of the trachea; not visible but is palpable
-capsule is the surrounding connective tissue
-septum separates the gland into larger and smaller lobules
-lobules are irregularly shaped sphere-like masses that are embedded in meshwork of reticular fibres; composed of follicles
-follicles are cavities filled with colloid, layered with simple cuboidal epith
-colloid- stiff material used to make future thyroxine
-how many are there?
-where are they located
-what hormone do they secrete
-what does it affect if there is a disease
-consist of 4-8 small endocrine glands, 2 on each side
-located on the posterior side of the thyroid gland
-secrete PTH that regulates CA and PHOS
-may alter function of thyroid if diseased
-helps defend body against disease; part of the immunity
-transport excess lymph (tissue fluid) to bloodstream
Tissue fluid that transports foreign particles to the lymph nodes and returns protein molecules into the bloodstream.
What is the Lymphatic Pathway?
1. Lymphatic Capillary-close ended tubes that extend into interstitial fluid to receive lymph
2. Lymphatic vessels- the vessels between lymphatic capillaries and lymph node; has one-way valves to prevent backflow
3.Lymph nodes: composed of lymphocytes and macrophages that filter toxins from the lymph to prevent entries into vascular system
4. Lymph trunks and collecting ducts- the little bulges on the vessel; it drains lymph from large body regions
5. Collecting ducts join the subclavian veins
What are the functions and structure of a lymph node?
Please label picture.
1. Capsule- surrounding connective tissue
2. Afferent- lymph flow into
3. efferent- lymph flows out; has a small depression called hilus
4. Trabeculae- connective tissues extending from the capsules between the nodules (5.)
6. Germinal Center- the middle of each nodule where masses of lymphocytes develop into B-cells and aid in the production of plasma cells.
Where are lymph nodes mostly located?
inguinal (groin) regions.
What are the 3 types of tonsilar tissue?
PALATINE TONSILS- 2 of them found between anterior and posterior faucial pillars; each mass contains fused-together lymphatic nodules and epithelial invaginations (grooves) that form tonsillar crypts
LINGUAL TONSILS- a layer of lymphoid tissues located on the dorsal surface of the tongue and behind the circumvallate
PHARYGEAL TONSILS- found behind uvula that forms incomplete ring of tissue called Waldeyer's ring
see picture for reference
When pharygeal tonsils become enlarge
-What does the anterior and posterior region of nasal cavity open up to?
-what is the median wall called?
-what is conchae?
-what is the nasal cavity lined with?
-posterior- nasopharynx; communicates with respiratory system
-median wall is called septum
-conchae: Lateral wall of nasal cavity has 3 projecting structures called the conchae which extend inward. Underneath each conchae, there is a passageway to paranasal sinuses and nasolacrimal ducts (tear ducts).
-lined with respiratory mucosa; contains goblet cells in the basement membrane
Goblet cells in nasal cavity
secret mucin to moisten the nasal cavity and trap foreign materials
lamina propia in nasal cavity
helps warm the air we breathe
olfactory mucosa in nasal cavity
receptors for smell
Erectile tissue in nasal cavity
covers each of the conchae and is responsible for great engorgement (fills with blood) of one of the openings every 30 - 60 mins to allow the tissue to recover from dryness caused by breathing.
How does it compare to nasal cavity
what are the 4 pairs
Paired, air filled, mucous-lined cavities in the head and cheek bones that drain into the nasal cavity through openings on the lateral nasal wall. Lined with respiratory mucosa.
Thinner with less goblet cells, thinner lamina propia and no erectile tissues compared to nasal cavity
frontal, ethmoidal, sphenoidal and maxillary sinuses
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