Astanga Hrudaya
विटपौ विधुराख्ये च शृङ्गाटानि सिरासु तु । अपस्तम्भावपाङ्गौ च धमनीस्थं न तैः स्मृतम् ॥ ४६ ॥
Vitapa, and Vidhura are classified as Snayu Marmas; and Shringataka, Apastambha, and Apalapa (written as Apanga in the translation note) are considered Sira Marmas, and not remembered as Dhamani Marmas by them.
english translation