Layers of Uterus

perimetrium

Which layer?

• Serosa

• Peritoneum

myometrium

Which layer?

• Muscularis

endometrium

Which layer?

Contains stratum basalis and stratum functionalis

stratum basalis

Which layer of the endometirum?

• Closer to myometrium

• Deep permanent layer

• Roots of structures:

  • Base of uterine glands

  • Beginning of spiral arteries

stratum functionalis

Which layer of the endometrium?

• Superficial layer that is shed each cycle

• Temporary structures:

  • Extensions of uterine glands

    • Secrete substances to support fetal development

  • Spiral arteries and branches

spiral arteries

• Connects to fetus and becomes primary blood supply for embryo and fetus

• Temporary

• Rapid-growing

• Regulated by estrogen and progesterone -> not enough causes them to close up and restrict blood supply to stratum functionalis

• Radial and straight arteries are NOT regulated by estrogen and progesterone