The Goddess who has promised to protect the foetus and facilitate healthy child birth

The shrines of Lord Mullaivana Nathar and Goddess Garbha Ratchaambikai are situated in the main outer prakaram facing the east direction. The sivalingam in the main sanctum of this temple is a Swayambu Lingam, one out of the 64 in the world. This Lingam is made up of ant hill mud. Hence there is no abhishekam for this Lord. Instead, the Lingam is merely pasted with a kind of mast called "punugu" in tamil. People who are afflicted with incurable diseases come to this temple, offer "Punugu Chattam" to the Lord and get themselves relieved of their diseases. It is believed that the Nandi and Karpaga Vinayagar inside the temple are also Swaymbu. In the Sivalingam one can see even today the impression of jasmine creepers which once covered the Sivalingam.

The shrine for presiding female deity Garbha Ratchaambikai is situated to the left of the Siva temple. There is also a shrine for Lord Subramanya. Inscriptions from Raja Raja Chola's period as well as those from Parantaka Chola's period - estimated to be in the early 10th century - are seen inside the temple. The special feature of this temple is that the moon's rays falls on the Sivalingam on the full moon day in the Tamil month of Panguni every year.

Legend says, Vedhikai, wife of Niruthuva Munivar and resident of this sthalam, was in the advanced stage of pregnancy. Her husband had gone to a distant place on some work. As it was summer time, she was very tired and was taking rest in her house. Another sage by name Oorthuva Paathar, who was passing by her house, was also very tired due the hot sun and hoped to get food and water from the inmates of this house. In spite of calling for help, no one came from inside the house and when the sage looked inside, he saw Vedhikai in a sleeping position showing her back to the sage. Not realising that Vedhikai was pregnant, he cursed her and went away. But by the time Vedhikai realised that someone has visited her house, sage Oorthuva Munivar had already left the place. Afraid of sage's curse, Vedhikai prayed to Mullaivana Nathar and his consort for safe delivery of her child. Lord Shiva's consort Uma Maheswari took necessary precautions and saw to it that Vedhikai gave birth to the child without any trouble. Vedhikai's husband Niruthuva Munivar came to know about these details from his wife on his return. He prayed to the goddess Uma Maheswari that She should protect the foetus of any pregnant woman who visits this sthalam and offers worship to Her. Goddess Uma Maheswari gave this boon to Niruthuva Munivar and She is known from that day as Karukkatha Nayagi or Garbha Ratchaambikai.

Many pray here for the boon of having a child and for a safe child-birth.

The temple is one of 274 Shaiva holy temples called Padal petra sthalangal and finds mention in Devaram. The temple also finds mention in Periya Puranam by Sezhkizhar. Vaikasi Visagam for Swami, Adipooram and Navarathri uthsavam for Ambal, Annabishekam, Kanthasashti, Karthigai Mahadeepam, Karthigai Sunday theerthavari and Panguni Uthram are some of the prominent festivals celebrated