AUTHOR’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, MAY 10 
HEART MUSCULATURE OF THE ATRIA 
JAMES W. PAPEZ 
Department of Anatomy, Emory University Medical School, Atlanta, Georgia 
EIGHT FIGURES (FOUR PLATES) 
CONTENTS 
IPL OC eaoo basen gece crc b0o50 6 CCEIOo fae Melis Bema Biota cst coln arcane i ara aaa 259 
Niatenalgandemebh Od starererretey: <terctcwy cites sore roricmhetco crs semen s sce te ec3 256 
Sino-aunicdlar node.and septalraphe. 525.00... vee c ce sete te ates s J ae' 2 256 
Mirsculacureromunernlointeairhini, semeiaccmic oem sievecieriine setts Ciers eie en 260 
Pe aterat rrp An se semer ery. Jeera s isthe 5 < eee ares mae atte oles 260 
Pad xterma pun cdlesrontacmich teatniuin)...-ck.- eer cio cee neice ac 261 
3. Right anterior crest and anterior pectinate muscles................... 263 
4, Right posterior crest and posterior pectinate muscles................. 264 
Daarsemla tire ol bie SIMMS VenasUS:. Wess oes oc)s <0 es alot Se toan sieaieee ots estate es 266 
onsen oie We ec choc Sie 5 go SOOM DE oc clo ob SOC aenas manna ae 266 
GasupenloravenarcayambunGdles prea sccm emcee ea oerecioees ole 267 
(privet leak Of SEP LMMESe CMG UMMle a5. 5s. Sco cous eleomes eel vines said oxen See 269 
SemluiontMeana Om sep timEp Rima «asian caiie dor aaetaeocee et. 270 
OM Musculature-oiche coronary SIMUSse. 5. 1 scoeceeeine sone obs teens oa 271 
Misculaiine Ob Ghe Lely AGTNUIans. . Apeerer eG «esa startles aye ere gage deod te <a elas 271 
10. Left anterior crest and anterior pectinate muscles.................... 271 
11. Left posterior crest and posterior pectinate muscles.................. 272 
i SepCOpMManary. DUNGIEShs.. .. seated snes «cS s.aeeta game oo ants one shoes nes 273 
Pa behead Of tae. Septum: SCCUNGUM ec ce. es acc oc es ante cae «ae owe ema » 274 
{fen soptaatriae DONCIGw AN... Heeneee st isk tt ee hod Se Aas eos ark 
Poeebekinledicom Sepcmna prima. . Bega os hess «02 they cos ee woe enone 275 
INoteronsnerverstpplyaoutheratria,. Saameeee ees aerate sare sero 276 
PURPOSE 
The purpose of this work is to establish more fully the arrange- 
ment of the muscle bundles of the atria of mammalian hearts. 
The origin of the excitatory process in the sino-auricular node 
of Keith and Flack has been the object of much experimental 
work. Wybauw (’10), by means of the electrocardiograph, and 
T. Lewis, Meakins, and White (’10 to ’14) have produced evidence 
to show that the excitation process which induces atrial systole 
255 
