Hanafi
The sources give no view for it here.
ابتلاع النخامة في الصوم
ما حكم ابتلاع النخامة في الصوم، وهل يفسد به الصوم؟
Each school’s answer
Hanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
ابْتِلاَعُ النُّخَامَةِ فِي الصَّوْمِ: ٥ - اخْتَلَفَ الْفُقَهَاءُ فِي حُكْمِ ابْتِلاَعِ النُّخَامَةِ فِي الصَّوْمِ فَذَهَبَ بَعْضُهُمْ إِلَى تَحْرِيمِ ذَلِكَ وَفَسَادِ الصَّوْمِ بِهِ وَخَالَفَهُمْ آخَرُونَ وَهَذَا فِي الْجُمْلَةِ. وَالتَّفْصِيل فِي (مُصْطَلَحِ صَوْمٍ ف ٧٩) .
«الموسوعة الفقهية الكويتية» (Kuwait) entry «نخامة» vol. 40 p. 126
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What bears this mark is in our words, our standard wording; the books’ texts stay as they are.