final chp 14 nervous system

Question 1

the mantle layers increase in?

Answer 1

mass

Question 2

mantle layers are composed of?

Answer 2

gray matter

Question 3

the mantle layer sides form masses called?

Answer 3

dorsal columns
lateral columns
ventral columns

Question 4

the marginal layer?

Answer 4

• framework of neuroepithelial and glia cells
• nerve fibers and myelin around the fibers
• thickening of area is due to the nerve fibers

Question 5

during what month of development does the spinal cord extend the entire length of the embryo?

Answer 5

the third month of development

Question 6

during the sixth month of development where does the spinal cord end?

Answer 6

1st sacral vertebra

Question 7

at birth where does the spinal cord end?

Answer 7

levels of 2nd and 3rd lumbar vertebra

Question 8

at adult where does the spinal cord end?

Answer 8

L1

Question 9

what are the primary brain vesicles?

Answer 9

forebrain/prosoencephalon
midbrain/mesencephalon
hindbrain/ rhombencephalon

Question 10

what are the secondary brain vesicles?

Answer 10

telencephalon
diencephalon
metencephalon
-pons
-cerebellum
-myelencephalon or medulla

Question 11

describe the cephalic flexure?

Answer 11

located in midbrain

• external bending
• flexure causes the end of the head to bend ventrally

Question 12

describe the cervical flexure?

Answer 12

located at junction of the myelencephalon and spinal cord

-external bending

Question 13

describe the pontine flexure?

Answer 13

metencephalon and myelencephalon

-internal bending