Astanga Hrudaya
ऊर्ध्वजत्रुविकारेषु विशेषान्नस्यमिष्यते। नासा हि शिरसो द्वारं तेन तद्व्याप्य हन्ति तान्॥१॥
Nasya- Nasal medication is especially described for the treatment of diseases of the parts above the shoulders; Nose is the gateway for the head, spreading through this, the nasal medication reaches all the parts of the head and neck and cures the diseases.
english translation
UrdhvajatruvikAreSu vizeSAnnasyamiSyate। nAsA hi ziraso dvAraM tena tadvyApya hanti tAn॥1॥
hk transliteration by Sanscript