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Animal/Dairy Science 434 . Lec 3: Male Reproductive Tract Anatomy. Learning Objectives. To be able to describe the male reproductive system in the bull. Structure Function. Testis. Epididymis. Factory 1-25 X 10 9 sperm/day “Plant” must be air conditioned. Finishing School

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animal dairy science 434

Animal/Dairy Science 434

Lec 3:

Male Reproductive Tract Anatomy

learning objectives
Learning Objectives
  • To be able to describe the male reproductive system in the bull.
    • Structure
    • Function
slide3

Testis

Epididymis

  • Factory
  • 1-25 X 109 sperm/day
  • “Plant” must be air conditioned
  • Finishing School
    • Fluid Absorption
    • 8-25 X 109 sperm
      • membrane changes
      • nuclear & flagellar stabilization
      • motility, fertility
      • cytoplasmic droplet translocation

Penis

  • Delivery System
    • Erection
    • Protrusion
    • Ejaculation

Tail of Epididymis

  • Warehouse and Delivery
    • Storage 10-50 X 109 sperm
    • Sperm for 5-10 ejaculates
    • Smooth muscle contractions upon sexual stimulation

Accessory Sex Glands

  • Alterations & Packaging
  • Metabolic substrates
  • Surface coatings
  • Transport for sperm
bull testis
Bull Testis
  • Tunica Vaginalis
    • parietal
    • visceral

Tunica Albuginea

bull tract

Scrotum

Bull Tract
  • Thermosensor
  • Radiator
  • Protective sac
bull tract1
Bull Tract

Longitudinal Section

Cross Section

testis
Testis

Testicular Parenchyma

Mediastinum

structure of the testis

Seminiferous Tubule

Tunica Albuginea

Rete Testis

(within the mediastinum)

Structure of the Testis
the testis
The Testis

Mediastinum

Rete Testis

Seminiferous

Tubule

structure of the testis1
Structure of the Testis

Seminiferous Tubule

Tunica Albuginea

Rete Testis

(within the mediastinum)

structure of the testis2

Spermatic Cord

Vas Deferens

Caput Epididymis

Vas Efferentia

6-12 tubules

Corpus

Epididymis

Cauda Epididymis

Structure of the Testis
  • Vasectomy
structure of the testis3

Spermatic Cord

Vas Deferens

Caput Epididymis

Vas Efferentia

6-12 tubules

Corpus

Epididymis

Structure of the Testis
  • Vasectomy

Seminiferous Tubule

Tunica Albuginea

Rete Testis

(within the mediastinum)

Cauda Epididymis

spermatic chord
Spermatic Chord

Pampiniform

Plexus

  • Vascular, lymphatic and nerves
  • Heat exchanger
  • Houses cremaster muscle

Testicular

Artery

  • Pampiniform Plexus
    • Counter Current Exchange
      • 39°C - 34°C
      • 70 ng T/ml - 4.8 ng T/ml
spermatic chord1
Spermatic Chord

Vas Deferens

Cremaster Muscle

Pampiniform Plexus

Parietal Tunica Vaginalis

contraction of the tunica dartos
Contraction of the Tunica Dartos

Testis

  • Tunica Dartos
  • Smooth muscle
  • Androgen dependent(Testosterone)
bull tract4
Bull Tract

Pelvic Genitalia

pelvic genitalia of the bull
Pelvic Genitalia of the Bull

Pelvic Urethra

Muscle

reproductive organs of the bull2

Retractor Penis

Muscle

Sigmoid

Flexure

Reproductive Organs of the Bull

Prostate

Rectum

Cowpers Gland

Seminal Vesicles

Ampulla

Bladder

Vas Deferens

Glans

Penis

Caput Epididymis

Scrotum

Testis

Cauda Epididymis

Gubernaculum