Uterine horns

Anatomical structure in some mammals

The uterine horns are the points in the female reproductive system where the uterus and the fallopian tubes meet. They are present in many mammals, including rodents, carnivores, and ungulates, but are absent in humans. In species with uterine horns, they play a crucial role in reproduction by providing a site for embryo implantation and development.

Anatomy

The uterine horns are extensions of the uterus that project laterally from the body of the uterus. They are connected to the fallopian tubes, which transport ova from the ovaries. In species with uterine horns, the uterus is often described as bicornuate, meaning it has two distinct "horns" or extensions. This structure is particularly adapted for species that give birth to multiple offspring at once, as it provides more space for embryo development.

Function

The primary function of the uterine horns is to support the development of embryos. In species with a bicornuate uterus, each horn can accommodate multiple embryos, allowing for larger litters. The uterine horns also play a role in the transport of sperm from the cervix to the fallopian tubes, where fertilization occurs.

Species variations

The presence and structure of uterine horns vary among different species. In rodents, the uterine horns are well-developed and can accommodate large litters. In carnivores, such as dogs and cats, the uterine horns are also prominent and facilitate the birth of multiple offspring. In contrast, primates, including humans, typically have a simplex uterus without distinct uterine horns.

Clinical significance

In veterinary medicine, the health of the uterine horns is important for the reproductive success of animals. Conditions such as pyometra, an infection of the uterus, can affect the uterine horns and require medical intervention. In some cases, surgical removal of the uterus and uterine horns, known as an ovariohysterectomy, is performed to prevent or treat reproductive diseases.

Images

Diagram of the female pelvis, showing the location of the uterine horns in species that have them.

Diagram illustrating the structure of uterine horns in a bicornuate uterus.

Related pages

• Uterus
• Fallopian tube
• Reproductive system

References

• E.S.E.,

 Reproduction in Farm Animals, 
  
 Lippincott Williams & Wilkins, 
 2000, 
  
  
 ISBN 978-0-683-30576-4,

• Evans, H.E.."The Uterine Horns in Domestic Animals".Journal of Veterinary Medicine.1998;45(3)

123-130.