A feilized ovum reaches uterine cavity in?
**Core Concept**
The fertilized ovum undergoes a series of cellular divisions and morphological changes as it travels through the fallopian tube, ultimately reaching the uterine cavity. This process is crucial for implantation and establishment of a successful pregnancy.
**Why the Correct Answer is Right**
After fertilization, the zygote undergoes cleavage, resulting in a morula, which then develops into a blastocyst. The blastocyst is composed of an inner cell mass and a trophoblast, which invades the uterine endometrium. The process of implantation typically occurs 6-10 days post-fertilization, when the blastocyst reaches the uterine cavity. The uterine cavity provides a favorable environment for embryonic development and implantation.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the fertilized ovum does not reach the uterine cavity immediately after fertilization. It takes several days for the zygote to undergo cleavage and develop into a blastocyst.
* **Option B:** This option is incorrect because the fallopian tube is the site where fertilization typically occurs, not the uterine cavity.
* **Option C:** This option is incorrect because the cervix is the lower, narrow part of the uterus that connects it to the vagina, not the site where the fertilized ovum reaches the uterine cavity.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the timing of implantation is crucial for a successful pregnancy. Any delay or disruption in the process can lead to miscarriage or failed implantation.
**Correct Answer:** C. The fertilized ovum reaches the uterine cavity 6-10 days post-fertilization.