Difference between revisions of "Nervous Pathway Eliciting Reproductive Behaviour - Anatomy & Physiology"

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<big><center>[[Reproductive System|'''BACK TO REPRODUCTIVE SYSTEM''']]</center></big>
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<big><center>[[ Reproductive_System#Reproductive_Behaviour |'''BACK TO REPRODUCTIVE BEHAVIOUR''']]</center></big>
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== Sensitization ==
 
== Sensitization ==
  
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* Reproductive behaviour can only take place if the neurons in the [[Hypothalamus_- Anatomy & Physiology#Hypothalamus|hypothalamus]] have been sensitized to respond to sensory signals.
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* Reproductive behaviour can only take place if the neurons in the [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|hypothalamus]] have been sensitized to respond to sensory signals.
  
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=== Male ===
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'''MALE'''
  
 
* Testosterone is aromatized to oestradiol in the brain.  Oestradiol promotes reproductive behaviour.   
 
* Testosterone is aromatized to oestradiol in the brain.  Oestradiol promotes reproductive behaviour.   
 
* Testosterone is produced in small episodes every 4-6 hours.
 
* Testosterone is produced in small episodes every 4-6 hours.
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* Relatively constant supply of testosterone, thus oestradiol, to the [[Hypothalamus_- Anatomy & Physiology#Hypothalamus|hypothalamus]] in the male.
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* Relatively constant supply of testosterone, thus oestradiol, to the [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|hypothalamus]] in the male.
 
* This allows the male to initiate reproductive behaviour at any time.
 
* This allows the male to initiate reproductive behaviour at any time.
  
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=== Female ===
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'''FEMALE'''
  
 
* Only experiences high oestradiol during the '''follicular phase'''.
 
* Only experiences high oestradiol during the '''follicular phase'''.
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=== Generic Neural Pathway for Sexual Behaviour===
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== Generic Neural Pathway for Sexual Behaviour==
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* Under the influence of oestrogen, sensory inputs such as [[Pre-copulatory Behaviour - Anatomy & Physiology#Vomeronasal_Organ|olfaction]], [[Attractivity Behaviour - Anatomy & Physiology#Auditory_Signals|audition]], [[Attractivity Behaviour - Anatomy & Physiology#Visual_Signals|vision]] and [[Pre-copulatory Behaviour - Anatomy & Physiology#Tactile_Stimulation|tactility]] send neural messages to the [[Hypothalamus_- Anatomy & Physiology#Hypothalamus|hypothalamus]] .
 
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* Sensory afferent neurons synapse directly on neurons in the [[Hypothalamus_- Anatomy & Physiology#Hypothalamus|ventromedial and pre-optic hypothalamic regions]].
 
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* These sensory inputs cause neurons in the hypothalamus to release behaviour specific peptides that serve as neurotransmitters.
 
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* Neurotransmitters act on neurons in the [[Midbrain_- Anatomy & Physiology|midbrain]].
 
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* Neurons in the midbrain serve as receiving zones for the peptides produced by [[Hypothalamus_- Anatomy & Physiology#Hypothalamus|hypothalamic neurons]].
 
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* [[Midbrain_- Anatomy & Physiology|Midbrain]] translated neuropeptide signals into a fast response.
 
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* Neurons in the midbrain synapse with neurons in the brain stem (medulla).
 
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* Nervous signals are integrated in the medulla.
 
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* From the medulla, nerve tracts extend to the spinal cord where nerves synapse with motor neurons that innervate muscles that cause [[Receptivity Behaviour - Anatomy & Physiology|lordosis]] and mounting.
 
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[[Category:Reproductive Behaviour]]
 
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[[Category:Bullet Points]]
 

Revision as of 11:37, 15 July 2008

BACK TO REPRODUCTIVE SYSTEM
BACK TO REPRODUCTIVE BEHAVIOUR



Sensitization

  • Reproductive behaviour can only take place if the neurons in the hypothalamus have been sensitized to respond to sensory signals.

MALE

  • Testosterone is aromatized to oestradiol in the brain. Oestradiol promotes reproductive behaviour.
  • Testosterone is produced in small episodes every 4-6 hours.
  • Relatively constant supply of testosterone, thus oestradiol, to the hypothalamus in the male.
  • This allows the male to initiate reproductive behaviour at any time.

FEMALE

  • Only experiences high oestradiol during the follicular phase.
  • Will only display sexual receptivity during oestrus.

Generic Neural Pathway for Sexual Behaviour

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