Architectural
structure & vocabularyCovering 5.9 hectares, the temple is larger than the Meenakshi temple of Madurai. The Rajagopuram, about 59 metres tall, is among the tallest gopurams in the state. The main shrine of Nellaiappar has a sanctum, ardha mandapa, maha mandapa and mani mandapa, with Vishnu set unusually as Anantha Sayana Padmanabha to its left. The temple faces east with a seven-tier Rajagopuram and a large white stucco Nandhi at the east entrance.
The second prakara holds Adhikara Nandhi, Thiagarajar, the 63 Nayanmars, Jwara Devar (three-faced, three-legged, three-handed), Muruga with Valli and Devayanai, and many more. The third prakara holds Samaya Kuravar Nalvar, Subramanya, Dakshina Murthy, the six-faced Arumuga Nayanar set so that all six faces can be seen, and Vinayaga. The mani mandapa leads to the maha mandapa with the famous musical pillars: forty-eight small pillars that sound notes on being tapped surround a central pillar, though many have lost their tone. The Kanthimathi temple has two musical pillars with squirrel carvings.
From 1647 CE the devotee Tiru Vadamalaiyappa Pillaiyar built the Sangili Mandapa connecting the Nellaiappar and Kanthimathi temples; to its west a flower garden was set up in 1756 CE by Tiruvengadakrishna Mudaliyar, with the hundred-pillared Vasantha Mandapa at its centre. Twenty-four pillars with yalis support the Oonjal (swing) mandapa of the Kanthimathi temple, built by Chera Kulam Piravi Perumal Pillaiyar in 1635 CE. A thousand-pillar mandapa was described as a forest of pillars by a British traveller. The bas-relief of Ravana lifting Kailasa is assigned to the 8th century.