Unit 7 - Female Reproductive System II Flashcards Preview

Microanatomy > Unit 7 - Female Reproductive System II > Flashcards

Flashcards in Unit 7 - Female Reproductive System II Deck (44)
Loading flashcards...
1

what are the 4 anatomical subdivisions of the oviducts?

1. infundibulum - funnel shaped end where the oviduct lumen opens to the peritoneal cavity
-fimbriae surround opening
2. ampulla - longest portion, and widest except for infundibulum
3. isthmus - straight part connecting ampulla and uterus
4. intramural part - passes through uterine wall

2

what are the 3 layers of the oviduct wall?

1. inner mucosa
2. middle muscularis
3. outer serosa

3

what comprises the inner mucosa of the oviduct?

1. mucosal folds - fill much of oviduct lumen to increase SA
-most elaborate in ampulla, simplest in intramural part
2. mucosal epithelium - simple columnar epithelium
-lines oviduct lumen and surfaces of fimbraie
-ciliated and secretory cells
3. lamina propria - highly cellular, well-vascularized CT
-has smooth muscle in finbriae for movement

4

what are the cell types in mucosal epithelium of oviduct?

1. ciliated cells - pale eosinophilic cytoplasm, large euchromatic basal nucleus, prominent apical cilia, and darkly staining basal bodies at cilia bases
-have motile cilia to sweep oocyte complex or fertilized embryo toward uterus
2. secretory (peg) cells - dark staining secretory products; apical surfaces protrude above epithelial surface
-secretions nourish and protect gametes/embryos, and help sperm activation

5

how do hormones affect mucosal epithelium of oviduct?

estrogen stimulates cilia elongation, increase secretions, and hypertrophy of both ciliated and secretory cells

6

oviduct muscularis

smooth muscle and some CT
-thick, inner, circularly-oriented layer and thin, outer, longitudinally-oriented layer
-thickens and becomes better defined from infundibulum to isthmus
-contractions bend infundibulum closer to ovary
-sweeps fimbriae over ovary surface
-peristaltic contractions propel fertilized embryos toward uterus

7

oviduct serosa

well-vascularized loose CT
-covered by simple squamous to cuboidal mesothelium
-provides blood and nerve supply to oviduct

8

what happens if an ectopic pregnancy is not aborted?

developing placenta erodes thick lining of blood vessels in oviduct serosa
-growing fetus eventually ruptures oviduct, causing lethal hemorrhage

9

anatomical overview of uterus

1. upper uterine body ("uterus")
2. lower uterine body ("cervix)
3. inner endometrium, middle myometrium, outer perimetrium/epimetrium

10

what are the layers of the endometrium?

1. stroma - CT of amorphous ground substance (some type III collagen, many fibroblasts)
2. simple columnar surface epithelium (mostly present)
3. uterine glands - simple, tubular glands lined by simple columnar secretory cells continuous w/ surface epithelium
4. spiral arteries (functionalis) and straight arteries (basalis)

11

what are the 2 arteries of the endometrium?

1. spiral arteries - supply upper endometrium (functional layer = functionalis)
2. straight arteries - supply lower endometrium (basal layer = basalis)

12

menstrual phase endometrium

progesterone loss after luteolysis causes constriction of spiral arteries and hypoxia of functionalis
-straight arteries and basalis are unaffected
-very short glands
-lacks surface epithelium

13

proliferative phase endometrium

estrogen from growing ovarian follicles promotes proliferation of stromal and gland cells (mitotic profiles)
-surface epithelium regenerates from growing uterine gland secretory cells
-stroma thickens via replication of basalis fibroblasts and ECM production
-straight uterine glands lengthen
-spiral arteries grow into reformed functionalis and sprout arterioles

14

secretory phase endometrium

progesterone from CL stimulates secretory cell hypertrophy and secretory activity, and promotes vascular changes
-coiling and dilation of uterine glands and secretion of glycogen-rich (apocrine) and glycoPRO-rich (merocrine) product
-thin-walled vascular lacunae develop and fill with blood
--abundant blood flow to placenta

15

endometriosis

presence of endometrial stromal and parenchymal cells outside uterus
-endometrium sloughed off during menses passes retrograde through oviducts, into peritoneal cavity (ovaries, outer surfaces of oviduct/uterus, broad ligament, colon, rectouterine pouch, rectal sheath)
-tissue is still hormone sensitive, undergoing cycles of growth and bleeding through menses
-pain (no longer cycle-dependent), inflammation, and adhesions between organ and peritoneal wall

16

what is a chocolate cyst?

specific case of endometrial tissue invading ovary tunica albuginea
-brown due to accumulated blood

17

myometrium

thickest layer of uterine wall
-bundles of smooth muscle are separated by CT
-organized into 3 partially interwoven, indistinct layers

18

what happens to the myometrium in pregnancy?

smooth muscle cell hyperplasia and hypertrophy
-increased collagen prouction
-thicken/strengthen myometrium during pregnancy
-changes revert after pregnancy through smooth muscle cell apoptosis, atrophy, and removal of excess collagen

19

what are uterine leiomyomas?

fibroids; 1:4 women
-benign smooth muscle tumors in myometrium

20

perimetrium/epimetrium

-serosal where exposed to peritoneal cavity
--loose CT, prominent blood vessels, covering of mesothelium
--continuous with broad ligament (uterine mesentery)
-adventitial where not exposed
-loose CT that blends into surrounding tissues

21

cervical mucosa

simple, columnar epithelium of mucous secretory cells
-long, non-coiled, branching tubular glands with wide lumens
-produce hormone-dependent consistency mucus that is not shed during menses

22

what are Nabothian cysts?

result from occlusion of cervical gland ducts
-secretory product accumulates in plugged ducts
-not neoplastic, and usually resolve without intervention
-also found in endometrium, so not reliable to identify cervix

23

cervical wall and during pregnancy?

dense CT with smaller amounts of smooth muscle
-during pregnancy, collagen and elastin fibers rearrange for birth

24

external os

protrusion of cervix into superior part of vagina
-transformation zone is junction between cervix (simple, columnar) and vagina (stratified squamous

25

what is the most frequent origin of cervical carcinomas?

external os

26

what are Pap smears?

cytological examinations of transformation zone scrapings to detect cervical carcinomas
-normal: squamous cells are uniform size with pyknotic nuclei
-abnormal: heterogenous and euchromatic nuclei

27

vaginal mucosa

statified, squamous, non-keratinized epithelium that accumulate glycogen in response to estrogen (fermented by bacteria to make acidic)
-frequently infiltrated by lymphocytes and neutrophils
-lamina propria is well vascularized and rich in elastic fibers (to muscularis), lymphocytes, and neutrophils
-NO GLANDS

28

vaginal muscular layer

smooth muscle fibers in 2 indistinct layers (inner circular and outer longitudinal)

29

vaginal adventitia

elastic CT forms resiliant sheath around muscular layer

30

nipple and areola

-highly pigmented skin that increases at puberty
-long dermal papillae
-radial and circumferential smooth muscle fibers in underlying dense, irregular CT allows erection
-sebaceous, sweat, and modified mammary (Montgomery) glands underlie areola