What Is the Uterine Cavity? - Size & Definition

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John Williams
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Christianlly Cena

Christianlly has taught college physics and facilitated laboratory courses. He has a master's degree in Physics and is pursuing his doctorate study.

The uterus is a key structure in reproduction and fetal development. The uterine cavity, found in the uterus, is a major player in these processes. Let's discuss the structure and functions of the uterine cavity in the female reproductive system. Updated: 11/28/2020

What Is the Uterine Cavity?

The phrase 'a bun in the oven' is often used to describe a baby that is developing in a mother's womb. Like cooked bread, it is important that a fetus remains in the uterus of a mother until it is fully developed, or 'done!' While the uterus itself has many functions in the process of fetal development, the space inside of the uterus, known as the uterine cavity, is one of the major structures necessary for the developing child.

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  • 0:00 What is the Uterine Cavity?
  • 0:31 Structure
  • 1:22 Function
  • 2:26 Lesson Summary
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The uterine cavity is formed by the lateral walls of the uterus, as well as the bottom wall of the fundus, or top portion of the uterus. These walls contain muscle tissue known as the myometrium and a layer of cells that line the outside edges known as the endometrium. The cavity itself has a T-shaped appearance in general, although the exactness of this shape will change during the course of the menstrual cycle. The width of the uterine cavity is usually between 27 and 32 mm in women prior to menopause, though this can vary from individual to individual. Since the uterus is the location for fertilized eggs to implant for pregnancy, the walls of the uterus will grow throughout the course of the cycle, and this will change the amount of space found in the uterine cavity.

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Additional Activities

Uterine Cavity: Word Scramble Activity

In this activity, you'll check your knowledge regarding the structure and function of the uterine cavity.


For this activity, study the scrambled letters and try to unscramble or rearrange the letters to form a word or phrase that fits the given clues. To do this, you must right-click and print this page. With a pencil and an eraser, neatly write your answers in the appropriate blank spaces in the clues.

Scrambled Words

  10. UDNUFS


  1. The __________ is the middle layer of the uterine cavity, consisting mainly of smooth __________ cells and vascular tissues.
  2. An __________ consists of a mucous membrane that lines the uterus in mammals and in which fertilized eggs are implanted.
  3. __________ is the biological process by which new individual organisms or offsprings are produced from their parents.
  4. The lower, narrow portion of the uterus where it joins with the top end of the vagina is called the __________.
  5. The uterine cavity is important in the act of sex, __________, and pregnancy.
  6. __________ refer to male reproductive cells that are one-half responsible for creating life.
  7. The __________ is a principal organ of the __________ reproductive system in which the young are conceived and develop until birth.
  8. __________ is the point when a woman no longer has menstrual periods.
  9. The __________ __________ serves as a space where fetal development is facilitated.
  10. The __________ of the uterus is the top portion, opposite from the cervix.

Answer Key

  1. Myometrium, Muscle
  2. Endometrium
  3. Reproduction
  4. Cervix
  5. Fertilization
  6. Sperms
  7. Uterus, Female
  8. Menopause
  9. Uterine Cavity
  10. Fundus

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