chapter 4

Question 1

the developing vertebrate nervous system is first visible as a patch of cells on the _____ surface of the embryo; this patch is called the neural _______

Answer 1

dorsal. plate

Question 2

the rhombencephalon, the mesencephalon and the prosencephalon are known more commonly as the ________, the _____, and the _____ , respectively.

Answer 2

hindbrain, midbrain, forebrain

Question 3

the lips of the neural_____ fuse to form the neural tube.

Answer 3

groove

Question 4

the alignment of developing neurons into the structures of the nervous system is called _____

Answer 4

aggregation

Question 5

the telencephalon and the____ compose the forebrain.

Answer 5

diencephalon

Question 6

in humans the human neural plate is the first apparent about __ days after conception

Answer 6

18

Question 7

the _______ and the myelencephalon compose the hindbrain

Answer 7

metencephalon

Question 8

migration of neurons occurs along temporary network of ______ glial cells.

Answer 8

radial

Question 9

the cells of the neural tube proliferate most rapidly at its _____ end

Answer 9

anterior

Question 10

at the tip of each growing axon is a _____

Answer 10

growth cone

Question 11

paradoxically, neuron ____ is an important of neural development; it greatly reduces the number of neurons in the developing brain

Answer 11

death

Question 12

many developing axons become _______ by _____ cells; this increases the speed of axonal conduction

Answer 12

myelinated. glial

Question 13

during the 4th week of parental devpt. swellings first become visible on the anterior end of the neural tube. at first there are ___ of them.

Answer 13

3

Question 14

the neural tube develops into CNS; the neural ____ develops into the PNS

Answer 14

crest

Question 15

of the brain’s 5 divisions the most anterior is the ________ and the most posterior is the ____-

Answer 15

telencephalon. myelencephalon

Question 16

prior to the devpt. of the neural plate, the cells that will ultimately compose it are ____

Answer 16

totipotential

Question 17

_______ occurs in the part of the neural tube adjacent to its fluid filled interior

Answer 17

proliferation

Question 18

the ____ lies between the diencephalon and the metencephalon

Answer 18

mesencephalon

Question 19

fasciculation encourages later growth cones to follow the trail of the ____ growth cone.

Answer 19

pioneer

Question 20

the fact that some axons grow to their correct target cells, even when the target cells have been transplanted to a new location supports the ______ theory

Answer 20

chemoaffinity

Question 21

the fact that some axons grow to the previous location of their correct target cells when the target cells have been moved supports the ____ theory

Answer 21

blue print

Question 22

substantial adult neurogenesis occurs in the ____ and the ____ bulbs

Answer 22

hippocampi. olfactory