PROSTATE, TESTICLE. 57 
glands, called Littrés glands, extending sometimes to the muscular coat. 
Their ducts, either short or long, and tortuous, open on the surface of 
the mucous membrane. In the posterior segment of the spongy por- 
tion of the urethra the ducts of Cowper's glands open. In the pros- 
tatie portion the mucous membrane is pierced by the prostatic and 
ejaculatory ducts. 
What is the structure of Cowper’s glands ? 
They are compound racemose glands, the alveoli of which are 
lined with cylindrical epithelium. 
PROSTATE. 
Describe the structure of the prostate. 
It is an organ that is partly muscular and partly glandular. It is 
surrounded by a dense capsule of connective tissue, within which is a 
layer of smooth muscle tissue. Between bands of smooth muscle 
tissue, of which the organ is largely composed, are lobules of gland 
tissue of the racemose variety. The alveoli are long and irregular in 
shape and are lined with cylindrical cells, as are the ducts also. As 
the ducts approach the urethral mucous membrane these cells become 
flattened. 
TESTICLE. 
What is the general structure of the testicle ? 
It is a tubular gland covered with a dense connective-tissue coat (the 
tunica albuginea). From the tunica incomplete septa pass in, divid- 
ing the gland into a number of communicating cavities, and uniting at 
the posterior superior part form a mass of dense connective tissue 
(corpus Highmori). In the cavities between the septa are the semin- 
iferous tubules, which, as they approach the corpus Highmori, become 
narrow and straight (tubuli recti) and are lined with cylindrical cells. 
On entering the corpus Highmori the tubuli recti form a series of com- 
municating channels (rete testis) lined with flattened epithelium. 
These channels, on emerging from the corpus H., form a number of 
conical masses (cont vasculos:) of which the head of the epididymis 
is made up. These tubules in the epididymis are lined with cylin- 
drical ciliated epithelium. From the head of the epididymis proceed 
the body and tail which are also lined with cylindrical ciliated cells. 
From the tail finally is formed a single tube—the vas deferens, 
