{ SPERMATOZOA
{ CONTRIBUTION. { SEMINAL GRANULES
{ { MUCIN AND WATER
{
SEMEN { VESICULAR { ALBUMIN
{ CONTRIBUTION. { ALKALINE SALTS
{ (In quantity greater { WATER
{ than all the rest.)
{
{ PROSTATIC { PROTEINS
{ CONTRIBUTION. { ALKALINE SALTS
{ (Viscid and opalescent.) { WATER

[Illustration: Plate II Male Sexual Apparatus]

The outer coat of the testis is called the tunica albuginea. [See
Plate 2.] This tunic or coat sends fibrous partitions into the testis
which divide the organ into lobules, each one being conical in shape
with the apex directed towards the epididymis, which is that mass of
blood vessels and tissues which one can feel on one side of each
testis. Within these lobules the spermatozoa are formed by a complex
process of cell division and cell germination upon whose description
we need not enter here.

The _spermatozoon_ may be described as the male sexual cell whose
function is to fertilize the female ovum. The spermatozoon is about
1/20 of an inch in length and consists of a head, body and a vibratile
tail. In the human spermatozoon the head is ovoid, appearing
pear-shaped or pointed in one view and elliptical in another.

The _epididymis_ referred to above, consists of a mass of coiled tubes
and blood vessels. After the secretion passes through the tortuous
coils of ciliated tubes of the epididymis, it is collected into a
single tube called the _vas deferens_, which passes as a part of the
spermatic cord from the scrotum, up through the groin and over the
pubic arch into the pelvic cavity, passing down back of the bladder
where it is slightly dilated into an _ampulla_, beyond which the duct
is again contracted into a narrow tube, and the two ducts, one from
either side, converge and pass into the _prostate gland_, where they
empty into the _urethra_.

_The seminal vesicles._--The seminal vesicles are small bladder-like
organs supposed originally to contain the secreted semen collected
from the testes. There are two of these vesicles, from each a small
duct joins the vas deferens making up what is known as the
_ejaculatory duct_. The two ejaculatory ducts coming together in the
prostate gland open into the urethra. _The seminal vesicles possess
glandular walls and secr