ON THE CEPHALIC VEINS AND SINUSES OF REPTILES, 
WITH DESCRIPTION OF A MECHANISM FOR RAISING 
THE VENOUS BLOOD-PRESSURE IN THE HEAD. 
BY 
HENRY L. BRUNER, PH. D. 
From the Biological Laboratory of Butler College. 
WitH 17 TEXT-FIGURES AND 3 PLATES. 
CONTENTS. 
PART FIRST. 
THE CEPHALIC VEINS AND SINUSES OF REPTILES (SAURIA, OPHIDIA, AND 
AW O(SH ELON DN VAG WAG) | Pate Wehnecriquoso Rete CRED ore HO-Dac ICO Gin EIDiGm ac iion are omer 
ESA CCT EA AS ISH ils Slcrausiecousisncee hobs ere rea neter eer e om MiG aIich Duewerevorecn ce eisiene 
HIRO DUG OMOGUS MAUPIN as eio sone oust oi lochetstene scat ons iene lel ereve oie chal etic neierer 
DSR S PEMA ODA: veya. s encvsiels ie saves ol chenenaciisic atoiere) cues ao evel peters euoueisy ssue stone 
IV. General summary, with comment on the cephalic veins and 
SINUSES VOL! POPLIN rc hot len orton etoleaete eal atic deo el vers yoteue strat evterte chisnens 
PART SECOND. 
ON THE SIGNIFICANCE OF THE BLOOD SINUSES IN THE HEAD OF REPTILES 
(SAURTAS OPHIDIA. AND! THSTUDENAWA)la sa a. cls eer 2 6 ieee) = 
I. Description of a swell mechanism in the head of Sauria......... 
A. Muscles which obstruct the vena jugularis interna and raise 
the venous blood-pressure in the head.............. 
a. The musculus constrictor vene jugularis interne..... 
i. Anatomical relations: sane steric ers ea se 
2 UMN SEVALLOM Macey ners cee eyo lacie beret eNews tars Tre eee 
a Ontozenys ands phiylOZenivea-rwyencneteceeteisnee eters 
(a), AUlovs) TAI E CULMS jorRORUIS Oe GUL, oh aadodnavoocdunoonaeac 
c. The musculus protrusor oculi accessorius............. 
B. Distension of veins and sinuses and elevation of venous 
blood-pressure in the head of the Sauria........... 
a. Distension of the sinus orbitalis and protrusion of the 
GCS eye eieeerarct ces maha cou rials ievaerevouchatsuer Sees ts o lev era oes 
Te ACtivays OF AMMULSClES 22s erase eretins cecil «os ces 
2. Secondary conditions which affect the distension 
Of the Sinus) Orbitalistn. a.eco4- cele c= = 26 Se 
AMERICAN JOURNAL OF ANATOMY.—VOL. VII. 
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