aa) 
352 Jacob Parsons Schaeffer. 
between the sinus maxillaris and the infundibulum ethmoidale 
(fig. 26) (table D, nos. 7 to 12). 
The following table gives an idea of the range of dimensions 
of the ostium maxillee as found in the series of specimens studied: 
TABLE D. 
NUMBER LENGTH WIDTH 
mm. mm. 
Ee eee) Pe Pee ES on okie Wn VR ee lh Dae ea ate 1 1 
i a BY RE UT ig Adam ns yan en te Pe; 2 3 3 
Se Le Ee EE tec eo a RS ashi atte eo OS 3 2 
A ete a aE ache PEE Eero ens Ae es SER RIEL CI Ee 5 3 
EE tk fhas hci MARS en Raa cb oe a at ke ce i 4 
OAS SES cae SoC AIR et teh re gta cea eee Sree n 8 3 
1 SRS Oe pI A MRE a, oe MA A dnt OST AN gh WON TG 10 6 
Oitodiee Saree cant ake! auth tae ath as shes AA, Reais iva ene Stee Mn hs ete Wil + 
Qt gtahnaaihs Sts SOUR Sg) Dk Aetna mS CAL olaeh URN SNH i iil 6 
1U URS ch cea ayy Ae a ER at ae Oo ts Oe oe els a eedonee = 14 3 
10 ay ee ee Ae etre Pee on MOR DAL NT 10s Ue ie nar am SER De Seance 19 3 
I ae RTE Ge bret MAT MEATS Ss oo Eco nny Attn MM eA Ab = 20 3 
THE OSTIUM MAXILLARE ACCESSORIUM. 
In many cases the sinus maxillaris has an accessory ostium 
communicating directly with the meatus nasi medius—the ostium 
maxillare accessorium: This opening is, as a rule, situated in the 
membranous portion of the lateral wall of the meatus nasi medius 
a short distance above the superior border of the concha nasalis 
inferior, at about the junction of its middle and _ posterior, 
thirds. In some instances the accessory ostium is placed imme- 
diately behind the dorsal termination of the infundibulum eth- 
moidale (fig. 27). This accessory ostium must not be confused 
with the duplication of the ostium maxillare, which communi- 
cates with the infundibulum ethmoidale. 
According to Chiari and Hajek an accessory opening is found 
in every fifth case in the meatus nasi medius, posterior and inferior 
to the normal aperture. Giraldés says it is found in 10 per cent 
of cases, and represents a pathological condition. Zuckerkandl 
and Kallius report it present in 10 per cent of cases. Turner 
found it four times in nine dissections. 
That this accessory opening occurs more frequently than is 
generally supposed seems proven by the study of 80 adult speci- 
