192 
THE STRUCTURE OF MAN 
Anamnia. 
The proximal portion becomes in 
most related to the testis, and 
Amniota. 
The proximal end becomes the rete 
and vasa efferentia testis, and the 
In 
The 
In 
od . ; sal caput epididymis, and perhaps 
ra functional in the transmission of P a! ame Pe gh 
. foi «te 
516 the semen, the distal functioning also the stalked hydatid of Mor- 
a as a kidney. gagni: the distal end becomes 
eB ; the paradidymis (Giraldé’s organ).” 
: 
o $ : 
Sia The greater part of the proximal 
& | Persists as the kidney. portion becomes the parovarium, 
Fy the distal the paroophoron.* 
Functions in most higher Fishes | The proximal portion becomes the 
: merely as the urinary duct. corpus and cauda epididymis, and 
 |In Selachians, Amphibians, and| the distal the seminal duct (vas 
ol some Ganoids, serves as the| deferens). 
a urinogenital duct. 
oO 
5 
S 4 The greater part, as a rule, degener- 
= ates ; the proximal portion may 
+ |S | Functions exclusively as the duct of be retained in a vestigial form in 
|e piles om the region of the parovarium. 
Ale the mesonephros, ¢.e. the urinary Le: : : 
5 dune certain cases ib may persist as a 
fy whole, as Gartner’s canal. 
distal end becomes the organ of 
Weber. 
In Elasmobranchs, for certain, it de- | The proximal portion becomes the 
generates in post-embryonic life,| unstalked hydatid of Morgagni, 
: vestiges of its proximal portion| the distal, in some Mammals, the 
i3 being retained. (Its fate in most| so-called ‘‘uterus masculinus.” 
ras s other Fishes is doubtful.) In Am-| In exceptional cases the whole is 
2 = phibia it is retained for its whole| retained as Rathke’s duct. 
a length, ina functionless and often| Sauropsida the distal part usually 
3 but little degenerate condition. disappears. 
a Becomes the whole genital duct. Becomes the whole genital duct. 
2 
Z| Development not yet fully worked 
Pia out. It appears to arise in part |’ 
oS (ureter) from the distal end of 
3 < ~~ | Probably unrepresented. the mesonephric duct, and in 
=) = part (secreting elements) as a 
2"| 2 caudad extension of the meso- 
E hros. 
&\s nephros 
= 
1 [The males of the Bony Fishes and of the Marsipobranchii are exceptions to 
this rule, the mesonephros being in them functional only as a kidney]. 
2 [Allowance being made for its entering into the constitution of the suprarenal 
body (cf. previous page). ] 
ole 
