chapter 12 terms

Question 1

last portions of neural groove to enclose

Answer 1

neuropores

Question 2

lateral portions of neural plate which migrate under ectodermal lining but detach from neural tube &raquo_space; give rise to ganglia and adrenal medulla

Answer 2

neural crests

Question 3

telencephalon and diencephalon derived from?

Answer 3

forebrain

Question 4

no secondary vesicles are derived here?

Answer 4

midbrain

Question 5

metencephalon and myelencephalon derived from?

Answer 5

hindbrain

Question 6

telencephalon gives rise too?

Answer 6

cerebral hemispheres

Question 7

diencephalon gives rise too?

Answer 7

thalamus, hypothalamus and epithalamus

Question 8

metencephalon gives rise too?

Answer 8

pons and cerebellum

Question 9

myelencephalon gives rise too?

Answer 9

medulla oblongata

Question 10

small brain and cranium but normal sized face

results in gross mental retardation

Answer 10

microcephaly

Question 11

failure of cleavage of the cerebrum

affected infants usually die within 6 months

several genes have been implicated with environmental influences

Answer 11

holoprosencephaly

Question 12

most of infant’s brain exudes from skull&raquo_space; may be left with only brainstem and improper vascularization also present

Answer 12

exencephaly

Question 13

failure of the bones of the cranium close

Answer 13

cranium bifidum

Question 14

small defect in which only the meninges containing CSF herniate

Answer 14

cranial meningeocele

Question 15

large defect in which part of the brain and the meninges herniate

Answer 15

meningoencephalocele

Question 16

very large defect in which the meninges and a part of the brain contain containing a portion of the ventricular system herniate

Answer 16

meningohydroencephalocele

Question 17

gives rise to ependymal cells

Answer 17

ventricular layer

Question 18

contains soma and comprised of the alar plate, basal plate,

Answer 18

mantle zone

Question 19

contains axons entering/leaving the gray matter&raquo_space; myelinated to become white matter of spinal cord

Answer 19

marginal zone

Question 20

neural tube defects involving vertebral arches&raquo_space; result from defective closure of caudal neuropore

Answer 20

spina bifida

Question 21

failure of vertebral arches to fuse in median plane

Answer 21

spina bifida occulta

Question 22

severe forms of spina bifida in which spinal cord and/or meninges protrudes through defect

Answer 22

spina bifida cystica

Question 23

sac contains meninges and CSF but spinal cord in normal position

Answer 23

spina bifida with meningeocele

Question 24

sac contains meninges and spinal cord

Answer 24

spina bifida with meningomyelocele

Question 25

neural ectoderm remains on surface

Answer 25

rachischis

Question 26

synapses with neurons of the spinal ganglia

Answer 26

axons from alar plate

Question 27

form synapses with myotome portion of somite well as other mesoderm

Answer 27

axons from basal plate

Question 28

rise to adult structures

Answer 28

portions of somites and other mesoderm