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Male Reproductive Anatomy

 

Male anatomy

I). Sperm travel:

Testes

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Epididymis

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Ductus deferens

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Urethra

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Penis

II). Scrotum

scrotum

A). Sac outside of abdominal cavity.

B). Function:

 

C). Spermatic Cord:

 

    Sensory nerve fibers located in the spermatic cord transmit pain impulses.

 

III). Testes (single testis)

Testis

A). Function:

B). Divided into 200-300 wedge shaped lobules.

    Testes and ovaries are from the same tissue

 

C). Seminiferous tubules:

Cells specialties

1). Leydig cells

2). Spermatogenic cells

D). Testis

Seminiferous Tubule
Seminiferous tubule
Sperm Cells
Developing spermatogonia
Interstitial cells

V). Duct System

A). The seminiferous tubules converge

Seminiferous tubulesÞ

tubulus rectusÞ

rete testisÞ

efferent ductulesÞ

epididymis

B). Epididymis:

During ejaculation the smooth muscle wall of the epididymis contract expelling sperm into the ductus deferens

Epididymis

 

Sperm Cells
Epithelial cells
Interstitial cells
Cilia

 

C). Ductus Deferens or Vas Deferens

Male reproductive
bulletRuns from the epididymis into the pelvic cavity and loops over the ureter.
bulletJoins with seminal vesicle to form ejaculatory duct.
bullet Ductus Deferens propels sperm into the urethra.

D). Urethra

regions:

1). Prostatic urethra:

2). Membranous urethra:

3). Spongy urethra:

 

V). Penis

A). Function:

B). Structure: external

 
bulletRoot
bulletShaft
bulletGlans penis
external urethral opening
prepuce or foreskin

C). Structure: internal

1). Spongy urethra

2). Erectile tissue:

a). Corpus spongiosum forms the bulb of the penis and the glans.

b). Corpus cavernosa paired erectile tissue.

*tunica albuginea is the surrounding connective tissue.

D). Histology

Penis
http://biology.clc.uc.edu/fankhauser/Labs/Anatomy_&_Physiology/A&P203/Reproductive_Tract_Histology/
bulletcorpus cavernosa
bulletcorpus spongiosum
bulleturethra

 
Male reproductive

IV). Accessory Glands

A). Seminal Vesicles:

Found:

Function:

(Male urethra & Female reproductive tract are acidic—prevents infection)

Joins ductus deferens where sperm and seminal fluid mix in the ejaculatory duct.

B). Prostate Gland

Found:

Function:

Joins at the prostatic urethra

C). Bulbourethral Glands (Cowper’s Glands)

Found:

Function:

D). Sperm

Sperm Sperm

http://weboflife.nasa.gov/currentResearch/currentResearchBiologyGravity/floatingFertility.htm

http://www.syndel.com/spawning/sex_on_the_farm_37.html

head
tail
midpiece