Cayuga (Northern Iroquoian) is a pitch accent language displaying different conditions for the accenting and lengthening of even-numbered and odd-numbered penults (counting from left to right). It is shown that Cayuga accent placement is predictable from metrical structure, and that metrical structure is in turn influenced by constraints on syllable structure. Syllable structure constraints are that: 1) all things being equal, coda consonants are parsed as light; and 2) vowel length is dispreferred. In odd-numbered penults, dispreferred syllable structure can be avoided, and this results in accented odd-numbered open penults and unaccented odd-numbered closed penults. In even-numbered penults, dispreferred syllable structure (especially that resulting from lengthening) is required in order to avoid metrically adjacent strong elements, and this results in the accenting of all even-numbered penults. The accenting patterns of Cayuga ultimately derive from the fact that Cayuga is a quantity-sensitive language that disprefers quantity.