Exam 3: Reproductive Behavior : Sex Part 2 Flashcards

1
Q

pheromones

A

chemical signals that communicate between animals
- female mice can identify individual males by pheromones in urine
bruce effect

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2
Q

bruce effect

A

pregnancy termination due to pheromones from a different mate

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3
Q

vomeronasal organ (VNO)

A

specialized receptor cells in nose that detect pheromones (not odors)

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4
Q

VNO axons go to accessory olfactory bulb which projects to the _____ and ____

A

medial amygdala (mPOA) and hypothalamus (VMH)

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5
Q

mPOA or VMH integrates what?

A

hormonal and sensory information and coordinates motor patterns of copulation
- connection between smell and amygdala

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6
Q

female sex behavior needs to be…

A

turned on

it is off unless turned on

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7
Q

ventromedial nucleus of the hypothalamus (VMH)

A

essential for sexual behavior in females (lordosis response)

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8
Q

VMH afferents

A

vomeronasal organ (pheromones) and somatosensory system via amygdala

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9
Q

estrogen increases…

A

dendritic trees of neurons in VMH and stimulates production of progesterone receptors

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10
Q

what happens when VMH gets more dendrites

A

the system is more sexually receptive

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11
Q

VMH sends axons to the ____ which projects to the ____

A

periaqueductal gray in midbrain

medullary reticular formation (NPGi)

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12
Q

How does NPGi project to spinal cord

A

reticulospinal tract

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13
Q

What needs to happen to initiate sex in males

A

remove the brakes, needs to be disinhibited

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14
Q

What coordinates male copulatory behavior

A

medial preoptic area of hypothalamus (mPOA)

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15
Q

afferents of medial preoptic area of hypothalamus

A

vomeronasal organ (pheromones) and somatosensory system via amygdala

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16
Q

mounting behaviors

A
  • mPOA sends axons to ventral midbrain
    • excitatory dopamine signals from substantia nigra synapse on neurons in basal ganglia
    • basal ganglia output neurons send excitatory signals to spinal cord to induce mounting
17
Q

ventral midbrain composed of

A

PAG and substantia nigra

18
Q

which pathway leads to copulation

A

going through the substantia nigra pars compacta

19
Q

which pathway leads to erections

A

PAG to NPGi

20
Q

Paragigantocellular nucleus (nPGi)

A

in medullary reticular formation
has axons fibers that inhibit the erection response
- serotonin

21
Q

2 route to shut down the nPGi

A

direct and indirect

22
Q

direct pathway to shut down the nPGi

A

mPOA inhibits nPGi inhibition of sexual behavior

23
Q

indirect pathway to shut down nPGi

A

via periaqueductal grey
PAG normally excites nPGi preventing erections
mPOA neurons inhibit PAG thus inhibiting nPGi

24
Q

lesions of mPOA

A

do not interfere with male’s motivation for copulation

  • they will still press a bar to gain access to receptive female but they seem unable to commence mounting
  • cannot control erections
25
Q

sex-related function associated with the reward system

A

triggers sexual motivation
mate choice
mesolimbic dopamine

26
Q

prefrontal cortex function associated with sex-related functions

A

blunts initiation of sexual behavior
modulates sex drive
- judgement and decision making
- changes levels of consciousness

27
Q

sex-related function associated with cingulate cortex

A

processing sexual stimuli in conflictuary contexts
modulates sexual drive
- detects conflicts

28
Q

sex-relation function of insula

A

awareness of tumescence of erectile organs
modulates sex drive
- regulates body states

29
Q

Parts of basal forebrain active in sexual behavior

A

nucleus accumbens - implicating reward system

30
Q

what suggests alteration of consciousness during orgasm

A

increased act9ivation in orbitofrontal cortex and anterior cingulate

31
Q

4 behaviors rat mothers show

A

nest building, crouching over pups, retrieving pups, nursing

32
Q

What plays a role in maternal behavior

A

anteroventral periventricular nucleus (AVPV) and mPOA

33
Q

what did the lesions of the MPA disrupt

A

both licking and pup retrieval

  • mothers ignored offspring
  • female sexual behavior was unaffected
34
Q

What regions are activated during parental care

A

ventral tegmental area motivation and reward center is activated
- caring for offspring feels good

35
Q

male interaction with infants is influenced by..

A

hormonal changes

  • reduced testosterone levels during fatherhood (more time spent with child - greater decline in testosterone)
  • increased prolactin levels in males after becoming fathers
36
Q

what happens with increased prolactin levels in males after becoming fathers

A
  • highest during infantile period and positively correlate with caregiving
  • more responsive to infant crying
37
Q

mPOA

A
  • lesions lead to less parenting behavior

- optogenetic activation of mPOA neurons in virgin males suppresses pup-directed aggression and increased pup grooming