But, unlike the tricuspid valve, the pulmonary valve doesn't have any of those chordae tendineae.

但与三尖，肺动脉没有腱索。

Both of these have chordae tendineae coming off of them that tether the valve to the papillary muscles in the left ventricle.

这两种都有腱索，连接到左心室的乳头肌上。

A 2015 study points to the chorda tympani, a nerve that carries taste information from the tongue to the brainstem.

2015 年的项究指出了鼓索，这是种将味觉信息从舌头传递到脑干的神经。

And each cusp looks kind of like a parachute, because it has tiny little strings, called chordae tendineae, coming off of it that tether the cusps to a small muscle called the papillary muscle.

每尖看起来就降落伞，因为它有很小的弦，叫腱索；腱索将尖连接在块叫做乳头肌的小肌肉上。

When the heart contracts, that papillary muscle keeps the chordae tendineae taut; and both of these help to prevent regurgitation of blood back into the atrium, allowing it to only flow out the next valve.

当心脏收缩时，乳头肌使腱索绷紧；两者有助于防止血液反流到心房，使血液只能从下膜流出。