11. The columella is vertical, arcuate , and slightly expanded. 12. Fine arcuate growth lines appear in the interstices of the spiral keels. 13. This anatomical variant is known as an arcuate foramen. 14. The distinction between an arcuate uterus and a septate uterus is not standardized. 15. The columella is very oblique, slightly arcuate , and shortly reflexed above. 16. The internal arcuate fibers decussate and continue ascending as the contralateral medial lemniscus. 17. The arcuate foramen is a common anatomical variation more frequently seen in females. 18. The internal arcuate fibers are composed of axons of nucleus gracilis and nucleus cuneatus. 19. After the raphe, they may be referred to as the internal arcuate fibers. 20. The fibers are smaller than the internal arcuate fibers connected with the medial lemniscus.
