Location: pear-shaped, hollow organ located in the pelvis between the bladder and rectum.
Function: the site of embryonic and fetal development. Its lumen continues with
the oviducts and the vagina.
- The body is the large upper portion of the uterus.
- The cervix is the lower, barrel-shaped part separated from the body by isthmus.
The cervical canal has a constricted opening or os at each end. The internal
os communicates with the cavity of the uterus; the external os, with the
- The straight arteries and proximal part of the spiral arteries do not
change during menstrual cycle. The distal portion of the spiral arteries undergoes
degeneration and regeneration with each menstrual cycle.
Function: cyclic changes each month that prepare it for the implantation of the
embryo: proliferative, secretory, and menstrual phases. The end of each cycle is
characterized by the partial destruction and bleeding is referred to as the menstruation
or menstrual flow.
or function layer, the thick part, which is sloughed off
Stratum basale (basal layer) is retained during menstruation and serves as the
source for the regeneration of the stratum functionale.
Function: transport of the egg.
Function: secretion of fluid.
Composition: loose connective tissue.
Function: enormous enlargement during pregnancy.
Composition: smooth muscle tissue
- The inner layer predominantly oriented parallel to the long axis of the uterus.
- The middle layer, the thickest circular or spiral layer contains numerous large blood vessels (venous plexuses) and
- The outer layer predominantly oriented parallel to the long axis of the uterus.
Composition: the thin layer of connective tissue
covered by mesothelium.