The Shloka 'Srinathadi Gurutrayam' invokes the Gurumandala that is most important in Srividya Krama. It deals with the Mantras of the Amnayas of Srividya. It is said that from the five faces of Sri Parameshwara (Tatpurushaadi), the five Amnayas with their various mantras originated. The Sixth secret face of Parameshwara is what is termed 'Anuttara' and this is the seat of Parabrahma Shakti Mahatripurasundari. It is highly subtle and not revealed easily to a Sadhaka. The first four Amnayas (Purva, Dakshina, Pashchima and Uttara) are applicable to Panchadashi Upasakas. The eligibility for the higher two Amnayas i.e. Urdhwa and Anuttara is initiation into Shodashi and Purnabhisheka.
Srinathadi gurutrayam - This refers to one's own Guru (Srinatha), Parama Guru and Parameshthi Guru.
Ganapatim - The Mantra of Mahaganapati and whose Upasana is a must before even initiation into Panchadashi.
Piithatrayam - The mantras for Jalandhara and Purnagiri and Kamaroopa Pithas, which are the first three Shakti Pithas of Amba and representing the trinity and their Shaktis - Mahakameshwari and Mahavajreshwari and Mahabhagamalini. The fourth Peetham, Mahodyana and the seat of Parabrahma Shakti Mahatripurasundari has to imagined in a state of transcendence over these three Peethas. Since the fourth represents the state of Turiya and it is imagined as existing in the state of absolute silence that exists between each of these Peethas and which are Actually states of Chitta.
Bhairavam - The mantras for eight Bhairavas starting with Mahamanthana Bhairava etc.
Siddhaugham - The mantras for nine Siddhas starting from Mahadurmanamba Siddha etc.
Vatukatrayam - The mantras for the three Vatukas (Brahmacharis or Bhairavas) - Skanda and Chitra and Virinchi Vatukas.
Padayugam - The mantras for Prakasha Charana and Vimarsha Charana of Sridevi.
Dutikramam - The nine (ten according to some tantras) Duti goddesses starting from Yonyamba and Yonisiddhanathamba etc.
Mandalam - The mantras for Agni and Surya and Chandra mandalas
Vira - The mantras for the ten Viras starting from Srishti bhairava etc.
Then come the mantras for the 64 Siddhas starting with Mangalanatha etc.
Navakam - The nine mudra mantras starting from Sarvasamkshobhini.
Viravali Panchakam - The mantras for Brahma, Vishnu, Rudra and Ishwara and Sadashiva Viravalis.
Malini - The Matrika Saraswati mantra.
Mantraraja - Mantraraja Nrisimha mantra according to our Sampradya. Others follow Devi Taraka in its place.
Gurumandalam: The Gurumandala proper includes mantras for Urdhwaugha, Parugha, Kamarajugha, Lopamudraugha and Paraaparugha, depending on one's Sampradaya. Each of these again has Divyaugha, Siddhaugha and Manavaugha Gurus in them.
Thus, this Shloka invokes all these deities who form the Amnaya Parivara and Gurumandala of Srividya Parabhattarika.
The shloka 'Purvam dakshiNa pashchimottaramayaM' speaks about the 27 Rahasyas or secrets. The above mantras along with a few other esoteric additions and the numerous mantras of the 6 Amnayas will constitute these 27 secrets of Srividya. Given below is a listing of the mantras in the various Amnayas.
Purvamnaya, the Eastern Quarter
Bala Tripurasundari (Adi Bala, Yoga Bala and Antya Bala)
Matangi (Rajashyamala, Shukashyamala, Sharikashyamala, Sangitashyamala, Venushyamala, Vinashyamala, Laghu Matangi, Hasanti Shyamala and Sumukhi)
Gayatri (Tripada and ChatuShpada)
Mahaganapati (Siddhi, Kshipraprasadana, Chintamani, Haridra, Lakshmi, Vakratunda, Viri, Kukshi, Trailokyamohana, Navanita, Arka, Kali, Heramba Vijaya, Shakti, Ugra and Mahocchishta Ganapati)
Subrahmanya (Skanda, Kumara, Guha, Subrahmanya and Brahmanya)
Pratyangira (Brahmi, Narayani, Raudri, Ugra Kritya and Atharvana Bhadrakali)
Dakshinamnaya, the Southern Quarter
Bagalaamukhi (Brahmastra Vidya) - Ranastambhini, Senastambhini, Devarshipitrstambhini, Trimurtistambhini, Trailokyastambhini, Brahmastra Upasamharika, Brhamastrastambhini Kali
Mahavarahi (Vashya Varahi, Astra Varahi, Brihadvarahi, Dhumravarahi, Kirata Varahi and Strustambhana Vartali)
Sharabheshwara (Sharabaha Kali)
Bhairava (Anga, Aghora, Bhima, Vijaya, Rakta, Kala, Samhara, Kapala, Siddha and Swarnakarshana Bhairava)
Medha Dakshinamurthy (sixteen including Lakshmi, Kirti, Samba, Veera, Apasmaranirvartaka Dakshinamurthy etc)
Pashchimamnaya, the Western Quarter
Lopamudra (Hadi Vidya)
Rama and Seeta
Krishna (Srividya Rajagopala, Mahavaikuntheshwara, Rajagopala, Sanatanagopala, Vidyagopala, Guptagopala and Anna Gopala)
Indra and other Dikpalakas
Uttaramnaya, the Northern Quarter
Durga (Mula, Shulini, Jwala, Lavana, Shanti, Asuri, Shabari, Bhramari, Pakshi, Ati, Vanadurga)
Dakshinaa Kaali (Maha kali, Guhya kali, Kamakala Kali)
Urdhwamnaya, the Quarter Above
Praasaada (Prasaadaparaa and Paraapraasaada)
Anuttaramnaya, the Quarter Beyond
Maha Paduka (Maha Maha Paduka, Para Paduka, Guhya Paduka, Kula Paduka, Shambhava Maha Paduka etc.)