histics 1 bilal marwa abdulwahhab idrees abdulaziz aljo3ry alanood alsolaihim 428histics
TRANSCRIPT
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HISTICS
1
Bilal MarwaAbdulWahhab
IdreesAbdulAziz AlJo3ry
AlAnood AlSolaihim
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By 3By 3rdrd week of intra-uterine life oogonia appear week of intra-uterine life oogonia appear..
Ovarian covering :Ovarian covering : By peritoneum “ visceral , parietal “By peritoneum “ visceral , parietal “
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1. Epithelium2. Tunica Albuginea3. Medulla4. Cortex 428HISTICS3
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Surface: germinal epithelium (tunica vaginalis)
Low cuboidal epithelium
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Tunica Albugine: dense fibrous C.T. Poorly
vascularized
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Medulla: loose vascular C.T. Hilus cell:
Like leydig cell in males Secrete Androgen like substance
No follicles, no ova, no oocytes in medulla (MCQ) (all follicles and ova are found in the cortex)
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Two types of cells1.Ovarian follicles (next slide)
2.Interstitial cells between follicles Fibroblast like Also known as (stromal cell)
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Before the onset of puberty all the follicles are primordial follicles (so it is present before & after puberty) non-growing – flat layer of cells
Follicles present only after puberty (growing) : Unilaminar primary follicles Multilaminar primary follicle Secondary Follicles Graffian Follices
Then it ruptures, releasing the oocyte to become corpus luteum 428HISTICS8
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Contain primary oocyte in the prophae of meiosis I
Except in the last stage in the mature (graafian folliicle) then it becomes a
secondary oocyte
Each primary oocyte is surrounded by one or more layers of cells called follicular cells
Primary oocyte is separated from follicular cells by zona reticularis, made by the primary oocyte and the 1st layer of follicular cells
The follicular cells are seperated from the CT of the cortex (stroma) by a basal lamina
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Abundant before birth Its primary oocytes:
Spherical cell Nucleus: Large, vesicular, 1 prominent
nucleolus Follicular cells:
squamous, attached by desmosomes, has basal lamina.
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Growth of oocyteGrowth of oocyte
It increases in size(120µm).It increases in size(120µm). Increase of nuclear size.Increase of nuclear size. Increase number of mitochondria.Increase number of mitochondria. Increase rER.Increase rER. Increase Golgi apparatus which Increase Golgi apparatus which
becomes peripheral in position.becomes peripheral in position.
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Primary oocyte enlarges. Follicular cells become cuboidal . Subdivided into:
Unilaminar primary follicle: follicular cells arranged in 1 layer
multilaminar primary follicle: More than one layer
Zona pellcida starts to be made in the unilaminar primary follicle,Follicular(granulosa) cells and oocyte secrete glycoproteins that surround the oocyte
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Stromal cells arranged around follicular cells forming: Theca interna (vascular) Theca externa (fibroblast)
Stromal cells: characteristics of steroid producing cells numerous lipid droplets “ lipid in nature “
Separated from follicular (granulosa) cells by basal lamina.
Theca interna: vascularized, more cellular, less fibrous , SER , mitochondria , pale cytoplasm
androstendion estrogen.androstendion estrogen. theca externa: less vascularized, less
cellular, more fibrous 428HISTICS14
granulosa cellsgranulosa cells
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Intercellular space filled with liquor folliculi (liquid)
Oocyte surrounded by of granulose cells project into the fluid filled antrum known as cumulus oophorus
Single layer of granulose cells immediately surround oocyte known as corona radiate.
A- The oocyte is fixed in zona pellucida by microvilli. B-The layer of granulosa cells adherent to zona
pellucida is fixed into to it by filopodia.
NB-follicular fluid is formed of plasma, glycosaminoglycans, steroid-binding protein and steroid hormones (estrogen-progesterone-androgen)
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Follicular cells of the wall of the follicles composed of membrana granulose
at ovulation the oocyte will be secondary
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remaining of graffian follicle ruptured blood vessels form clot known
as corpus hemorrhagicum clot removed by phagocytosis
LH converts hemorrhagicum into corpus luteum
Function as endocrine gland Composed of :
Granulosa lutein cells Theca lutein cells
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No pregnancy –> corpus of menstruation
There’s pregnancy ->corpus of pregnancy
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80% Derived from granulose cells Granulosa cells increase in size ( not in
number) giving granulosa lutein cells Microvilli, has the organelles of steroid
producing cells Some lipid droplets Produce progesterone
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20% Derived from theca interna cells
(estrogen precursors) Organelles of steroid producing cells (
rich in lipid droplets )
Produce progesterone , estrogen and androgens
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Corpus luteum invaded by fibroblasts becomes fibrotic and is converted into corpus albicans ( degenerated corpus luteum )
So it is derived ONLY from corpus luteum
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Most follicles degenerate before reaching mature stage
Forming atretic follicles Theca interna Interstitial cells Theca interna Interstitial cells
(secrete steroid hormone) (secrete steroid hormone)
Eventually phagocytosed by macrophage
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Continuous with the wall of the uterus
Divided into four regions:1. Infundibulum has fimbriae2.Ampulla where fertilization occur3.Isthmus4.Intramural region
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Has three layers:1. Mucosa2. Muscularis3. Serosa Mucosa: longitudinal folds, simple
columnar epithelium, has two cells: Peg cells: have no cilia secretory function Columnar ciliated cells beat toward the
uterus
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longitudinal folds (infudibulum & ampulla), simple columnar epithelium, has two cells:
Peg cells: have no cilia secretory function Columnar ciliated cells beat toward the
uterus Lamina propria: loose connective tissue
contains fibroblasts mast cells lymphocytes and collagen . Highly vascular
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2. Muscularis: inner circular outer longitudinal and connective tissue fills spaces between them (thick in isthmus)
3. Serosa: simple squamous epithelium, loose connective tissue has blood vessels and autonomic nerve fibers
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Divided into three regions: Fundus Body Cervix
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Early proliferative Early proliferative phase of phase of endometriumendometrium
Late proliferative Late proliferative phase of phase of endometriumendometrium
Proliferation of glands, stroma &vessels.(very thick & rich in glands )
Gland is large
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Early secretory Early secretory phase of phase of endometriumendometrium
Late secretory Late secretory phase of phase of endometrium.endometrium.
Increase the size and coiling of the glands.
Glycogen accumulates in glandular epithelial cells
The glands are tortuous and full of glycogen and glycoprotein.
The stroma is highly vascular.
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menstruationmenstruation
Vasoconstriction in the spiral arterioles of the functionalis layer,leads to ischemia and degeneration of functionalis.
Leakage of blood. Degeneration of stroma cells leads to
collapse of the glands. Shedding of the functionalis
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Simple columnar epithelium composed of nonciliated secretory columnar cells and ciliated cells
Lamina propria: dense irregular collagenous connective
tissue highly cellular and contains star shaped cells , macrophages leukocytes and reticular fibers. Houses branched tubular glands
Consist of 2 layers: Functionalis thick superficial layer Basalis: deep narrow layer where glands
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Inner and outer longitudinal muscle layers
Middle circular Highly vascularized region (stratum
vasculare) houses arcuate arteries When covered by serosa it will be
squamous mesothelial cells resting on areolar connective tissue.
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Lined by mucous secreting simple columnar epithelium External surface covered by stratified
squamous nonkeratinized epithelium “ similar to wall of vagina “
Wall of the cervix dense collagenous connective tissue with many elastic fibers and few smooth muscle fibers
Cervix mucosa will not sloughed off during menses.
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Non – muscular
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placentaplacenta
early late
The placenta barrier is formed ofThe placenta barrier is formed of:: 1-Syncytiotrophoblasts .
2-Cytotrophoblasts.3-Basment membrane of cytotrphoblasts.
4-CT. core 5-basment membrane capillary endothelial cells
6-Capillary endothelial cells
The placenta barrier is formed of 5 layersThe placenta barrier is formed of 5 layers: 1-Syncytiotrophoblasts
2-Basment membrane of trophoblasts3-CT core .
4-Basment membrane of endothelial cells of the capillary of villi.
5-Capillary endothelial cells.
*Synctyiotrophoblast erodes maternal blood vessels
*from the remainder of trophoblasts chorion developes and gives rise to chorionic villi
at full term the placenta will not have
cytotrophoblast
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lumen is lined by stratified squamous nonkeratinized epithelium
the cells store large deposits of glycogen lamina propria: loose fibroelastic connective
tissue with lymphocytes and neutrophill ,no glands, pale cytoplasm , acidic , no goblet cell
It’ kept wet by endometrium muscularis: outer longitudinal inner circular “
not continous , interrupted by C.T “
adventitia: dense fibroelastic connective tissue
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at puberty there is an increase in connective and adipose tissue , C.T
the glands within the breast are classified as compound tubuloalveolar glands,
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lactiferous sinus and duct lined by stratified cuboidal epithelium
smaller ducts are lined by simple columnar epithelium
myoepithelial cells are present Terminal ends of the ducts show dilated acini Each lobule will be enlarged while the inter and intra-lobular tissues are decreased.
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alveoli composed of cuboidal cells secretion have two kinds : lipids and
proteins lipids secreted by apocrine mode proteins secreted by merocrine mode reduction of interlobular tissue. reduction
of intralobular CT.distended acini (alveoli) with milk.Acini are lined with flat epith.
NB.Suckling stimulate prolactin and oxytocin hormones secretion
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LactatingLactating
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Mechanism of milk secretion Contain protien , lipid , water ,
myoepithelial cell “ contractile “
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