Week 5

Question 1

Neurons in the anterior hypothalamus pre-optic area have a significantly large number of dendrite spins during periods of _____________

Answer 1

high activity and high sexual hormones

Question 2

Why are neurons in the pre-optic area larger during times of high activity

Answer 2

mice are highly active during estrus phase thus there is a high hormone level> Larger neurons in this regions allow for better spacial tracking during wandering.

Question 3

How do snakes show seasonal arborization

Answer 3

during periods of dormancy there is significantly less arborization. This is because snakes are more active and more sexual during the spring and thus we see more arborization

Question 4

How do hormones affect the arborization of neurons

Answer 4

Increased sex hormones (testosterone or estrogen) results in a significant increase in arborization

Question 5

How are the neurons of the SNB’s arborization affected by castration

Answer 5

Castration causes a significant decrease in arborization because they loss access to the testosterone

Question 6

In the medial amygdala We can see that testosterone______________________

Answer 6

lengthens the neuron.

Question 7

estradiol activates locomotion behavior and

Answer 7

increases spatioal memory cappabilities.

Question 8

_______ is rapidly unregulated after neural injury. This is because estrogen is vital for neural recovery

Answer 8

aromatase

Question 9

This was shown when cerebral esthemia was induced which is the restriction of blood flow. They found that the injury was ________ when estrogen was present

Answer 9

significantly reduced

Question 10

_________ meaning “living beside” a technique used to study physiology. It combines two living organisms together which are joined surgically to develop a single physiologic system

Answer 10

parabiosis

Question 11

___________ prothoracic trophic hormone acts on the gland ecdysone. When released ecdysone triggers ecdysis

Answer 11

PTTH

Question 12

_______ complete reorganization of nervous system.

Answer 12

metamorphosis

Question 13

neurorsecretaory cells secrete prothoracic hormone PTTH. PTTH stimulates prothoracic gland to release _________

Answer 13

ecdysone

Question 14

corpus cardiac and corpus allatum secrete ________

Answer 14

juvenile hormone JH

Question 15

__________________ high JH until final install of ecysteroid trigger mounting

Answer 15

larval instar

Question 16

during the last install phase what hormone greatly decreases

Answer 16

JH

Question 17

_________ indicates commitment to pupation

Answer 17

commitment phase

Question 18

Ecdysone causes ________________ in

manduce

Answer 18

PPRM muscle
and motoneurondegeneration

*new muscles of the myoblasts will develop

Question 19

Ecdysterone causes ________________ in drosophila

mushroom body

Answer 19

glial-induced

axonal degeneration

Question 20

What is the purpose of neuronal plasticity

Answer 20

Underlies changing motivational states
● Essential for repair of damaged nervous system
● Steroids play an essential role in these processes