Placenta & Male Repro Flashcards
4 extra embryonic mem
Splanchnopleure: Yolk sac➡️foregut
Somatopleure: amnion & chorion-⛔️bv
Splanchnopleure: allantois➡️hindgut
Temp organ made of fetal & maternal tissue (uterus)
Placenta
Fn:
- Nutr & gas exchange
- Endocrine: progesterone, gonadotrophin, IFN-t
- Unique proteins (PAG)
Allantois (bv) + chorion
Allantochorion ➡️ placenta
Permits HEMOTROPHE
2 major placentas
- Yolk sac= choriovitelline= omphaloid
2. chorioallantoic= allantoic
CA Placenta Classification: maternal tissue
Nondeciduate = noninv (sow & mare) Deciduate = inv (carnivores)
CA Placenta Classification: contact areas
Diffuse: chorion frondosum (sow & mare)
Cotyledonary: localized c.frond➡️caruncles=placetomes (ruminants)
Zonary: c.frond bands (carnivores)
CA Placenta Classification: layers
Epi theliochorial (all 6) Hitotrophe impt Synepi theliochorial (5) Endo theliochorial (4) Hemochorial (3)
Six layers of nutrient exchange
Uterine endothelium Ut. CT Ut. Epi Chorioallantoic epi Fetal CT Fetal endothelium
CA Placenta Classification: projections
FVL
Folded: plicae & rugae
Villous: in ut crypts
Labyrinthe: carnivores
Nondeciduate
Folded
Epitheliochori
Areola
Porcine placenta
Nondeciduate Diffuse Villous Epitheliochorial Microplacetomes Endometrial cups Hippomanes
Equine placenta
Nondeciduate/partially
Cotyledonary
Villous
Epitheliochorial
Ruminant placenta
Convex placetomes: cow
Concave placetomes: ewe & doe
⛔️10% rule Deciduate Zonary Labyrinth ENDOtheliochorial
Carnivore placenta
Layers of Carnivore Placenta
Chorioallantois Labyrinth/lamellae: syntrophoblasts & decidual cells Spongy layer Supraglandar layer Deep glandular layer
At periphery of attachment zone turns black/green in dog and cat placentas
Marginal hematomas
Viceral & parietal laminae of TESTIS
Tunica Vaginalis
Stroma of TESTIS, white DICCT
Tunica albuginea & tunica vasculosa
Septula
Mediastinum: rete testis
Parenchyma of the testis
CSRE
Convoluted seminiferous tubules: (somatic & germ cells)
Straight st (stallion)
Rete testis
Eff ductules
Peritubular cells, diploid
Flat nuclei & contractile properties
Help rel sperm to lumen
Myoid cells
Spermatogenesis
Spermatogonia➡️spermatozoa
Spermatocytogenesis: spermatogonia A& B➡️prim spermatocyte (ds diploid)
Meiosis: diploid➡️ ds haploid
Spermiogenesis: ss haploid morphogen
Spermiogenesis
ACFR
Acrosome cap
Chromatin condense ⛔️pyknotic
Flagellum form from 1 centriole
Residual body= excess cytoplasm
Oval nuclei, cytoplasm spans length of seminiferious epi
Fn: support/nutrients, phagocytosis, secrete ABP/inhibin/estrogen
Sertoli cells
Sir Toli
Tight junctions ➡️ basal + adluminal compartments
Fn: protect cells (except spermatogonia A)
Blood-Seminiferous Tubular Barrier
B-STB
