Annotations on the back read "Fig 3 to illustrate a paper entitled:- 'Phrenic nucleus of the macaque' Remarks-do not reduce more than 1/2. Insert in text. Author R. Warwick and G.A.G. Mitchell. Anatomy Dept, University, Manchester 13, England. Omit tile. Cp accompanying print".
This diagram features, along with VFA.7.339 & VFA.7.340 in the publication R. Warwick & G.A.G. Mitchell, 'The phrenic nucleus of the macaque', Journal of Comparative Neurology, 1956, 105(3), pp.553-85.
Phrenic nucleus in the macaque
Bottom centre.