Figure 5
(A) Cross section through the terminal crest (TC) at its origin (point 1 of fig 1A) showing its relation to the musculature of Bachmann's bundle (BB) in a 46 year old man. Note the change between the predominantly transverse muscle fibres of the terminal crest and the longitudinal fibres of Bachmann's bundle. (B) This section from a 76 year old woman taken at point 4 (fig 1A) shows a fibrotic area at the border between the terminal crest and the pectinate muscle (PM). Masson's trichrome stain. Endo, endocardium; Epi, epicardium.