Difference between revisions of "Nervous Pathway Eliciting Reproductive Behaviour - Anatomy & Physiology"
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* Sensory afferent neurons synapse directly on neurons in the [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|ventromedial and pre-optic hypothalamic regions]]. | * Sensory afferent neurons synapse directly on neurons in the [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|ventromedial and pre-optic hypothalamic regions]]. | ||
* These sensory inputs cause neurons in the hypothalamus to release behaviour specific peptides that serve as neurotransmitters. | * These sensory inputs cause neurons in the hypothalamus to release behaviour specific peptides that serve as neurotransmitters. | ||
| − | * Neurotransmitters act on neurons in the midbrain. | + | * Neurotransmitters act on neurons in the [[Midbrain_-_Anatomy_%26_Physiology|midbrain]]. |
* Neurons in the midbrain serve as receiving zones for the peptides produced by [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|hypothalamic neurons]]. | * Neurons in the midbrain serve as receiving zones for the peptides produced by [[Endocrine_System_-_Hypothalamus_-_Anatomy_%26_Physiology#Hypothalamus|hypothalamic neurons]]. | ||
| − | * Midbrain translated neuropeptide signals into a fast response. | + | * [[Midbrain_-_Anatomy_%26_Physiology|Midbrain]] translated neuropeptide signals into a fast response. |
* Neurons in the midbrain synapse with neurons in the brain stem (medulla). | * Neurons in the midbrain synapse with neurons in the brain stem (medulla). | ||
* Nervous signals are integrated in the medulla. | * Nervous signals are integrated in the medulla. | ||
* From the medulla, nerve tracts extend to the spinal cord where nerves synapse with motor neurons that innervate muscles that cause [[Reproductive_Behaviour_-_Receptivity_Behaviour_-_Anatomy_%26_Physiology|lordosis]] and mounting. | * From the medulla, nerve tracts extend to the spinal cord where nerves synapse with motor neurons that innervate muscles that cause [[Reproductive_Behaviour_-_Receptivity_Behaviour_-_Anatomy_%26_Physiology|lordosis]] and mounting. | ||
Revision as of 06:45, 17 July 2008
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
- Under the influence of oestrogen, sensory inputs such as olfaction, audition, vision and tactility send neural messages to the hypothalamus .
- Sensory afferent neurons synapse directly on neurons in the ventromedial and pre-optic hypothalamic regions.
- These sensory inputs cause neurons in the hypothalamus to release behaviour specific peptides that serve as neurotransmitters.
- Neurotransmitters act on neurons in the midbrain.
- Neurons in the midbrain serve as receiving zones for the peptides produced by hypothalamic neurons.
- Midbrain translated neuropeptide signals into a fast response.
- Neurons in the midbrain synapse with neurons in the brain stem (medulla).
- Nervous signals are integrated in the medulla.
- From the medulla, nerve tracts extend to the spinal cord where nerves synapse with motor neurons that innervate muscles that cause lordosis and mounting.