ALS causes the death of neurons controlling voluntary muscles in the body.

侧索硬化症会导致控制身体随意肌的神经元死亡。

Damage to the corticospinal tract causes weakness and problems with voluntary muscle movement below the level of the spinal cord segment.

损伤皮质脊髓束可以导致感觉平面以下的肌肉无力和随意运动障碍。

When a person has ALS, their motor neurons, the cells responsible for all voluntary muscle control in the body, lose function and die.

当一个人患有ALS时，他们的运动神经元负责所有体内自主肌肉控制的细胞会失去功能并死亡。

The corticospinal tract is a descending pathway that carries motor information from the brain to different muscles in the body, and it controls voluntary muscle movement.

皮质脊髓束是一条下行通路，携带从大脑向全身肌肉传递的动作信息，控制肌肉的随意运动。

Finally, there's the corticospinal tract, which is a descending pathway that carries motor information from the brain to different muscles in the body, and it controls voluntary muscle movement.

最后是皮质脊髓束：它是一条携带运动信息的下行通路，将运动信息从大脑传输到身体的不同肌肉，控制着肌肉随意运动。

Skeletal muscle is also termed voluntary striated muscles. The name " striated" comes from the characteristic cross striations of the muscle fibers when viewed under a microscope.

骨骼肌也称为随意横纹肌。当在显微镜下观察时，肌纤维上可见特征性横纹，" 横纹肌" 的名称就来源于此。

Skeletal Muscles are innervated, to communicate nervous energy to, by nerves, which conduct electrical currents from the central nervous system and cause the muscles to contract, so skeletal muscles are also called voluntary muscles.

骨骼肌受神经支配，中枢神经系统的神经冲动以电流的形式通过神经纤维传导而引起肌肉收缩（原文没有捋顺，所以直接按翻译资料来的，communicate这一小句没有翻出来），因此骨骼肌又被称为随意肌。

A voluntary muscle consists of a fleshy part or belly and ends in a cod-like sinew or tendon, the fleshy belly is attached to one bone while the tendon passes over a joint to become firmly attached to the adjoining bone.

随意肌由肉质部分或者说肌腹组成，末端为鳕鱼状腱或肌腱，肌腹附着于一块骨上，而肌腱跨过关节牢固地附着在邻近的骨骼。