C26 - Ductus deferens, accessory male genital glands

Question 1

Ductus deferens

Answer 1

• Ductus deferens is the direct continuation of the ductus epididymis
• Pathway:
  
  • Originates at the underlying part of cauda epididymis
  • Passes along the medial border of the testis
  • Ascends within the spermatic cord
  • Enters the abdominal cavity through canalis inguinalis
  • Forms a cranial convex loop within mesoducutus deferens (a fold of peritoneum)
  • Opens in the proximal part of urethra at the colliculus seminalis
  • The terminal part of ductus deferens is thickened to form ampulla ducuts deferens (ø su)
• Horse & ruminants: Ductus ejaculatorius: ductus deferens is joined by ductus excretorius of gl. vesicularis

Structures:

• Ampulla ductus deferentis (Ø su)
• Ductus ejaculatorius
• Plica genitalis

Question 2

Accessory male genital glands

Where are the accessory male genital glands located in general?

Answer 2

Located along pelvic portion of urethra

Question 3

Accessory male genital glands

Name the accessory male genital glands with their structures

Answer 3

• Ampulla ductus deferens (ø su)
• Gl. vesicularis (ø car)
  
  • Ductus excretorius
• Gl. prostatae
  
  • Facies ventralis
  • Facies dorsalis
  • _​_Corpus prostatae
  • Pars disseminata prostatae
  • Lobus dexter et sinister
  • Isthmus prostatae (eq)
  • Parenchyma
  • Ductuli prostatici
  • Capsula prostatae
• Gl. bulbourethralis (ø ca)
  
  • Ductus gl. bulbourethralis

Question 4

Accessory male genital glands

Gl. vesicularis

Answer 4

• Ø car
• Paired
• Location: dorsolateral to cervix vesicae
• Eq, ru: Ductus ejaculatorius: ductus excretorius joins ductus deferens just before its termination
• Sus: Gl. vesicularis opens separately into urethra next to the seminal colliculus

Question 5

Accessory male genital glands

Gl. prostatae

Answer 5

• Secreting into the pelvic part of urethra
• Consists of 2 parts (ø eq)
  
  • Pars disseminata prostatae: spread within the wall of the pelvic urethra
  • Corpus prostatae: external to the urethra

Structures:

• Facies ventralis
• Facies dorsalis
• Corpus prostatae (ø small ru)
• Pars disseminata prostatae (ø eq) (Forms a glandular layer in the wall of the pelvic urethra)
• Lobus dexter et sinister (Eq: right and left lobes are connected by an isthmus. Car: they are partially divided by a groove)
• Isthmus prostatae (eq) (Lies between the lobes, across the dorsal surface of cervix vesicae)
• Parenchyma (Glandular substance)
• Ductuli prostatici (Numerous excretory ductules open into urethra)
• Capsula prostatae (Containing smooth muscle)

Interspecies differences:

• Corpus prostatae (ø small ru)
• Pars disseminata prostatae (ø eq)
• Isthmus prostatae (eq)
• Ru: corpus prostatae is small and flat
• Car:
  
  • Pars disseminata prostatae is vestigal
  • Pars compacta is large
  • Entirely surrounds the urethra (ca), or partly (fe)
• Lobus dexter et sinister:
  
  • ​Dog: prostata is divided by a median groove, completely surrounds the urethra
  • Eq: right and left lobes are connected by isthmus prostatae

Question 6

Accessory male genital glands

Gl. bulbourethralis

Answer 6

• Ø ca (very small in fe)
• Paired
• Ductus gl. bulbourethralis
• Location: dorsal surface of the caudal end of the pelvic urethra
  
  • ​Closely related to bulbus penis

Question 7

Accessory male genital glands

Draw the accessory male genital glands

Answer 7