Finally the first thoracic nerve root or T1 provides sympathetic innervation for the head, neck, and eyes.

最后，第一条胸神经根（T1）含有交感神经，支配头部、颈部与眼。

Now, at the first thoracic nerve root or T1, you've got sympathetic nerves that supply the head, neck and eyes.

同时，交感神经纤维，从第一胸髓神经根或T1发出，支配你的头、颈和双眼。

These are grouped into 8 pairs of cervical nerves, 12 pairs of thoracic nerves, 5 pairs of lumbar nerves, 5 pairs of sacral nerves and 1 pair of coccygeal nerves.

这些脊神经分为8对颈神经、12对胸神经、5对腰神经、5对骶神经与1对尾神经。

Now some of the cervical and thoracic nerves form the brachial plexus, which is a network of nerves that controls the muscles and sensations in the shoulder, arm, and hand.

部分颈神经和胸神经构成臂丛神经；臂丛神经网络支配肩部、手臂与手部的运动和感觉。