Shiva Purana
हृत्कण्ठतालुभ्रूमध्यब्रह्मरन्ध्रसमन्विताम् ॥ छित्त्वा पर्यष्टकाकारं स्वात्मानं च सुषुम्णया ॥ ४७ ॥
The heart, throat, palate, eyebrows, middle and brahma-holes are situated in the body. He cut himself into eight pieces with the Sushumna.
english translation
hRtkaNThatAlubhrUmadhyabrahmarandhrasamanvitAm ॥ chittvA paryaSTakAkAraM svAtmAnaM ca suSumNayA ॥ 47 ॥
hk transliteration by Sanscript