While the conjoined twins have been willing to share insight into their captivating personal lives, like Abby marrying husband Josh Bowling in 2021, they also decided to educate the public with a recent clip about their physical makeup.
"Abby and Brittany Hensel's anatomy is a remarkable blend of shared and individual organs and tissues," explainedthe video, created by molecular biologist Hashem Al-Ghaili and shared on the Hensels' TikTok account Dec. 30. "The twins each have their own distinct upper body systems. Abby and Brittany have two heads, two brains, two spinal cords and two hearts, which are part of a shared circulatory system."
Although the 34-year-old sisters—among the oldest dicephalic parapagus conjoined twins—share blood circulation, their brains and spinal cords "function independently."
This is why Abby, who is on the right side, controls the right arm and leg while Brittany manages the left.
"Despite this division, their movements are highly coordinated," the narrator continued. "For activities requiring both arms, such as holding objects, typing on a keyboard or steering a car, they rely on constant cooperation and communication."
In fact, that was a central theme in the twins' series Abby & Brittany. Over a decade ago, viewers saw the pair navigate life as teenagers, including sitting behind the wheel.
"We have two licenses," Abby explained on the TLC show in 2012. "When we got our driver's licenses, we each had to take the test. We both passed."
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As for how they go about the task?
"When we drive," Brittany noted, "Abby is in control of the gas and the brakes and then we both steer."
Along with their two brains, two hearts and two spinal cords, the TikTok video explained that Abby and Brittany also have "four lungs—two partially fused, two stomachs, two gall bladders, three kidneys, one liver, one small intestine, one large intestine, one pelvis, one bladder" and "one set of reproductive organs."
Since the twins have their own stomachs, they digest their food separately—which also goes for the pain they may feel in those organs.
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"If my stomach hurts, and it hurts right here," Abby explained in the series, pointing to Brittany's stomach, "I can't feel anything."
"I can only feel my right side," Abby added, as Brittany chimed in, "I can only feel my left side."
Along with their reality TV show and recent life updates, like Abby getting married and the twins becoming fifth-grade teachers, they've continued to prove that nothing will stop them.
"Despite their unique anatomy," the video's narrator concluded, "Abby and Brittany have defied the odds, living full, active lives through cooperation and extraordinary coordination. Their story remains a testament to the adaptability of the human body and the resilience of the human spirit."
Now, read on to learn more about Abby and Brittany.