In this position, the ulnar nerve is covered only by skin and cubital tunnel ligament tissue, making it perhaps the longest area of semi-exposed nerve in your body.

这个角度位置，尺神经肤和肘管韧带组织覆盖，成为身体中最半暴露神经区域。

This little tube of tissue is known as a siphuncle, and as unassuming as it seemed, it helped Plectronoceras perform a trick the world had never seen before.

这个组织管称为体管，虽然看起来不起眼， 但它帮助Plectronoceras完成了一个前所未见绝技。