Charak Samhita
मन्ये संश्रित्य वातोऽन्तर्यदा नाडीः प्रपद्यते । मन्यास्तम्भं तदा कुर्यादन्तरायामसञ्ज्ञितम् ॥४३॥
॥ Antarayama (Emprosthotonous)॥ When vata get localised in the manya (neck), lateral aspect of the neck and gets spread into the internal vessels, it causes manyastambha otherwise named as antarayam (Emprosthotonus).
english translation
manye saMzritya vAto'ntaryadA nADIH prapadyate । manyAstambhaM tadA kuryAdantarAyAmasaJjJitam ॥43॥
hk transliteration by Sanscript