Topic #5 Development of the central nervous system

Question 1

development of the specific tissues and organs of the body.

Answer 1

organogenesis

Question 2

composed of the brain & spinal cord.

Answer 2

Central Nervous System (CNS)

Question 3

are the basic functional units of the CNS

Answer 3

neurons (nerve cells)

Question 4

connective tissue cells of the central nervous system

Answer 4

gliocytes

Question 5

neuron consists of;

Answer 5

nerve cell body
axon
dendrites

Question 6

which contains cytoplasm and nucleus;

Answer 6

nerve cell body

Question 7

which conducts impulses away from the cell body.

Answer 7

axon

Question 8

the axon presents at its end many tiny branches

Answer 8

telodendria

Question 9

where impulses leave the neuron

Answer 9

telodendria

Question 10

number of axon in all neurons

Answer 10

one

Question 11

which receive stimuli from the environment and convert these stimuli into impulses

Answer 11

dendrites

Question 12

neuron w/ only one process
(axon only)

Answer 12

unipolar neuron

Question 13

neuron w/ two processes
(axon and dendrite)

Answer 13

bipolar neuron

Question 14

neuron w/ many processes
(one axon & many dendrites)

Answer 14

multipolar neuron

Question 15

enlarged cranial portion of the neural tube becomes the?

Answer 15

brain

Question 16

the slender middle and caudal portions become the?

Answer 16

spinal cord

Question 17

neural canal becomes the?

Answer 17

ventricles of the brain and the central canal of the spinal cord

Question 18

neural crest cells become?

Answer 18

neurons of the PNS

Question 19

inner layer; composed of neuroepithelial cells that remain lining the central canal and designated as ependymal cells

Answer 19

germinal layer or ventricular zone

Question 20

middle layer; zone of high cell density, formed by accumulation of neuroblasts and glioblasts.

Answer 20

mantle layer or intermediate zone

Question 21

the outer layer surrounding the mantle layer; cell-sparse zone where axons of neurons and some gliocytes are present; becomes the white matter of the CNS w/c contains mainly myelinated axons of neurons

Answer 21

marginal layer

Question 22

2 plates that is divided the lateral wall of the neural tube.

Answer 22

Alar or Dorsal plate and Basal or Ventral plate

Question 23

bilateral indentation in the neural cavity that serves as a landmark to divide the wall

Answer 23

sulcus limitans

Question 24

contains cell bodies of efferent or motor neurons that send axons into the PNS.

Answer 24

Basal Plate

Question 25

contains neurons that receive afferent or sensory input from the PNS

Answer 25

Alar Plate

Question 26

derived from mesenchymal mesodermal cells

Answer 26

microgliocytes

Question 27

midline region of the wall dorsal to the neural canal

Answer 27

roof plate

Question 28

counterpart wall ventral to the neural canal

Answer 28

floor plate

Question 29

3 brain vesicles

Answer 29

i. Prosencephalon (forebrain)
ii. mesencephalon (midbrain)
iii. rhombencephalon (hindbrain)

Question 30

occupies the rostral part of the head.

Answer 30

prosencephalon (forebrain)

Question 31

located posterior to and marked off from the prosencephalon by a slight

Answer 31

mesencephalon (midbrain)

Question 32

located posteriorly and marked off from the mesencephalon by a slight constriction.

Answer 32

rhombencephalon (hindbrain)

Question 33

the cranial neural tube that will develop into brain presents 11 enlargements called?

Answer 33

neuromeres

Question 34

are a sign of metamerism or segmentation in the embryo

Answer 34

neuromeres

Question 35

occurs at the level of the midbrain; concave ventrally

Answer 35

midbrain flexure

Question 36

occurs between the midbrain and the hindbrain; concave dorsally.

Answer 36

pontine flexure

Question 37

appears at the junction of the hindbrain and spinal cord; persists slightly in domestic animals; concave ventrally.

Answer 37

cervical flexure