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Topic: Columnar epithelia


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 Epithelial Tissue
We will begin with the simple epithelia, as they are easier to visualize, and then touch on pseudostratified columnar epithelium before we move on to the stratified squamous epithelium.
The cells of the basal layer of the epidermis (closest to the dermis) are cuboidal to columnar in shape.
The tall, vertical cells seen at the top of the tissue are columnar cells (one is shown - red arrow), which make up simple columnar epithelium (the cells at the bottom of the image are connective tissue, which will be discussed later).
www.uoguelph.ca /zoology/devobio/210labs/epithelial1.html

  
 Epithelial Tissue
We will begin with the simple epithelia, as they are easier to visualize, and then touch on pseudostratified columnar epithelium before we move on to the stratified squamous epithelium.
The tall, vertical cells seen at the top of the tissue are columnar cells (one is shown - red arrow), which make up simple columnar epithelium (the cells at the bottom of the image are connective tissue, which will be discussed later).
One of the nuclei of a squamous cell is shown (arrows), which demonstrates how the nuclei can "bulge out" along the simple squamous epithelial layer.
www.uoguelph.ca /zoology/devobio/210labs/epithelial1.html

  
 Epithelial Tissue
We will begin with the simple epithelia, as they are easier to visualize, and then touch on pseudostratified columnar epithelium before we move on to the stratified squamous epithelium.
Epithelial tissues come in three basic types: squamous, cuboidal and columnar.
The cells of the basal layer of the epidermis (closest to the dermis) are cuboidal to columnar in shape.
www.uoguelph.ca /zoology/devobio/210labs/epithelial1.html   (939 words)

  
 Blue Histology - Epithelia and Glands
Stratified columnar epithelia are found in the excretory ducts of the mammary gland and the main excretory duct of the large salivary glands.
Stratified columnar epithelia are found in the largest excretory ducts of some glands.
Stratified squamous epithelia vary in thickness depending on the number of cell layers present.
www.lab.anhb.uwa.edu.au /mb140/CorePages/Epithelia/Epithel.htm   (939 words)

  
 ASCCP - Practice Recommendations - Practice Management Materials
The net result is a zone of squamous metaplasia of variable width distal (caudal) to the columnar epithelium and proximal (cephalad) to the “original squamous epithelium” laid down during embyogenesis.
The maturation and glycogenation of the squamous epithelia of the vagina and cervix are influenced by ovarian hormones.
The squamocolumnar junction, where these two meet, is the most important cytologic and colposcopic landmark, as this is where over 90% of lower genital tract neoplasia arises.
www.asccp.org /edu/practice/cervix/histology.shtml   (939 words)

  
 Morphologic demonstration of cytoplasmic ASSAM-related antigenic substance (CASSAM) by an immunoperoxidase technique.
Murine senile amyloid protein identified in the senescence-accelerated mouse (SAM) was called ASSAM, and the ASSAM-related antigenic substance was detected in the cytoplasm of hepatocytes, columnar epithelia of the small intestine, and epithelia of the proximal convoluted tubules of the kidney, with the use of an immunoperoxidase method.
This substance, called CASSAM (cytoplasmic ASSAM-related antigenic substance), did not stain positively with Congo red nor fibril structure, as determined under an electron microscope.
Morphologic demonstration of cytoplasmic ASSAM-related antigenic substance (CASSAM) by an immunoperoxidase technique.
www.arclab.org /medlineupdates/abstract_3907365.html   (309 words)

  
 Conversion of ES cells to columnar epithelia by hensin and to squamous epithelia by laminin -- Takito and Al-Awqati 166 (7): 1093 -- The Journal of Cell Biology
Conversion of ES cells to columnar epithelia by hensin and to squamous epithelia by laminin -- Takito and Al-Awqati 166 (7): 1093 -- The Journal of Cell Biology
www.jcb.org /cgi/content/abstract/166/7/1093   (309 words)

  
 Pathology
The mucosa of the renal pelvis, ureter and urinary bladder is lined by stratified epithelium, the urothelium or transitional epithelium (from the erroneous concept that this epithelium constitutes a transition between stratified squamous and columnar epithelia).
Transitional epithelium is a stratified epithelium characterized by the fact that the most apical cells are the roundest and largest in diameter.
The epithelium is 2-3 cells thick in the pelvis, up to 5 in the ureter and up to 7 cells thick in the bladder in the undistended state.
www.med-ed.virginia.edu /courses/path/urinary/uroth1.cfm   (309 words)

  
 Lab Exercises- Calyx, Ureter, Bladder
Some areas still have only a simple columnar epithelium, others have the mixture of types of epithelia typical of transitional epithelium.
The epithelium of the minor and major calyces is transitional, beginning with 2-3 layers and ending with 8 or more layers.
Underneath the epithelium is a layer of connective tissue.
cellbio.utmb.edu /microanatomy/kidney/bladder_lab.htm   (309 words)

  
 Biopsies of Human Olfactory Epithelium -- Jafek et al. 27 (7): 623 -- Chemical Senses
Yamagishi, M. and Nakano, Y. A re-evaluation of the classification of olfactory epithelia in patients with olfactory disorders.
The human olfactory epithelium is a pseudostratified columnar
A dendritic process or an olfactory receptor cell (arrowhead) is seen immedicately adjacent to a ciliated respiratory cell (asterisk), revealing a junction of respiratory epithelium (left) with the olfactory epithelium (right).
chemse.oxfordjournals.org /cgi/content/full/27/7/623   (2635 words)

  
 Exercise 4: Epithelium
Stratified cuboidal epithelium is fairly common in large gland ducts and in some of the very largest ducts of large glands, such as the mammary gland, it may grade into stratified columnar.
A good example of the mitotic activity of epithelia is found in the intestine, slides 40 and 41.
Covering and lining epithelium is classified histologically on the basis of two criteria: the number of cell layers present and the shape of the cells in the top layer.
education.vetmed.vt.edu /Curriculum/VM8054/Labs/Lab4/Lab4.htm   (1648 words)

  
 Epithelium
One type of epithelium may change into another type — metaplasia eg replacement of the squamous epithelium of the oesophagus by columnar epithelium (Barrett's oesophagus) may result from reflux oesophagitis
Specialised structures are present in epithelia which link individual cells together.
Mesothelium- squamous epithelium of mesodermal origin lining serous membranes and cavities
www.up.ac.za /academic/medicine/telemed/Hist/epiteel/epiteel01e.html   (547 words)

  
 SIU SOM Histology INTRO
Certain epithelia, notably epidermis and intestinal epithelium, are continually recycled, with with new cells being created by mitotic activity while old cells are sloughed off (from the surface of the epidermis or the tips of intestinal villi).
A pseudostratified columnar epithelium is characteristic of the respiratory tract and of the ducts in the male reproductive system.
Simple squamous epithelium may be located at sites of rapid diffusion, such as the lining of lung alveoli, the lining of blood vessels (called endothelium), and at sites where very little activity is occuring, such as Bowman's capsule in the kidney and the lining of major body cavities (called mesothelium).
www.siumed.edu /~dking2/intro/epith.htm   (2143 words)

  
 Zoology 531 - Lecture Outline 2 - Epithelia
2) Intraepithelial Gland: Restriction to Stratified Epithelia and Pseudostratified (Columnar) Epithelia Only
Zoology 531 - Lecture Outline 2 - Epithelia
Secretory Units of Mixed Advanced Multicellular Exocrine Glands
www.ucalgary.ca /~embryo/z531/531lo02.html   (63 words)

  
 FAHERS 211 The Lacrimal appartatus
The walls of the lacrimal sac consist of fibroeleastic tissue and are lined by a mucous membrane consisting of stratified cuboidal/columnar epithelium containing goblet cells.
Reflex excess lacrimation occurs following irritation of the cornea, conjunctiva and nasal epithelia.
The lacrimal apparatus consists of the lacrimal gland, lacrimal puncta, lacrimal canaliculi, lacrimal sac and naso-lacrimal duct.
www.lab.anhb.uwa.edu.au /vsci/Lacrimal.htm   (63 words)

  
 "Information resources on old world camels: Arabian and Bactrian 1962-2003"
Descriptors: dromedary camels, adult animals, anatomy and histology, major salivary glands, parotid, mandibular, sublingual, color and mean weight, tubulo-alveolar, cuboidal and simple columnar epithelia, squamous, other types of cells.
Descriptors: dromedary camel, adult animals, circulatory pattern, blood vessels, arteries, angiography of hip joint, source is deep femoral, medial circumflex femoral, caudal gluteal, lateral circumflex femoral and obturator arteries, obturator artery g ave off ramus acetabularis cranialis and ramus acetabularis caudalis, medial circumflex femoral artery issued the ramus acetabularis, anastomosis around the joint.
Descriptors: 35 dromedary camel fetuses, prenatal nose anatomy, anatomy study of various ages, structure of dorsal, middle and ventral nasal conchae, spiral lamellae, size of recesses and sinuses, surface epithelium.
www.nal.usda.gov /awic/pubs/Camels/camels.htm   (8910 words)

  
 "Information resources on old world camels: Arabian and Bactrian 1962-2003"
Descriptors: dromedary camels, adult animals, anatomy and histology, major salivary glands, parotid, mandibular, sublingual, color and mean weight, tubulo-alveolar, cuboidal and simple columnar epithelia, squamous, other types of cells.
Descriptors: dromedary camel, adult animals, circulatory pattern, blood vessels, arteries, angiography of hip joint, source is deep femoral, medial circumflex femoral, caudal gluteal, lateral circumflex femoral and obturator arteries, obturator artery g ave off ramus acetabularis cranialis and ramus acetabularis caudalis, medial circumflex femoral artery issued the ramus acetabularis, anastomosis around the joint.
Camel trains carried supplies to the outback mining and ranching stations, and aided in the general exploration and construction of transcontinental telegraph lines and railroads.
www.nal.usda.gov /awic/pubs/Camels/camels.htm   (8944 words)

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