6.2a Development of the CNS Flashcards Preview

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Flashcards in 6.2a Development of the CNS Deck (58):
1

Process by which the neural plate forms the neural tube

Neurulation

2

Length of the entire process of neural fold formation, elevation, closure (in days)

28 Days

3

CNS development starts at the ___ (in weeks)

3rd week

4

Elevation on the lateral edges of the thickened neural plate

Neural folds

5

The closure of the neural tube begins at the

Middle part, approximately at the cervical region or the 5th somite

6

Day of closure of anterior and posterior neuropore

Day 25 and Day 28, respectively

7

Lining that comprises the neuroepithelial layer

Pseudostratified epithelium

8

Cells that form the mantle layer

Neuroblasts

9

Origin of the gray matter of the spinal cord

Mantle layer

10

__ plate is the dorsal thickening of the neural tube which contain dorsal sensory horn cells

Alar plate

11

__ plate is the ventral thickeing of the neural tube which contain ventral motor horn cells that eventuall becomes the motor area

Basal Plate

12

What is the longitudinal groove that marks the boundary between the alar and basal plates

Sulcus Limitans

13

The intermediate horn is the accumulation of neurons between the ventral motor horn and dorsal sensory horn; this is only present in the __ and __ of the spinal cord

Thoracic and upper lumbar levels of the spinal cord

14

The outermost layer of the spinal cord and forms the white matter of the spinal cord

Marginal layer

15

The axons of neurons in the basal plate break through the marginal zone and become collectively known as __

Ventral motor root of the spinal nerve

16

Axons of neurons in the alar plate form

Association neurons

17

These suporting cells are formed from neuroepithelial cells after the production of neuroblasts ceases

Gliablasts

18

Glial cells that mirated to the mantle layer become the

Protoplasmic and fibrillar astrocytes

19

Glial cells that migrated to the marginal layer that form myelin sheaths become the ____

Oligodendroglial cells

20

Origin of microglial cells

Vascular mesenchyme

21

When the neuroepthelial cells cease to produce neuroblasts and gliablasts, they differentiate into __

ependymal cells

22

These cells form the lining of the central canal of the spinal cord and the ventricles

Ependymal cells

23

Two processes of sensory ganglia and structures they form

Centrally-growing processes: dorsal sensory root of spinal nerve

Peripherally-growing processes: join with the ventral motor roots to form the trunk of the spinal nerve

24

Termination of the spinal cord at birth and during adult life

Birth: L2-L3
Adult: L1-L2

25

Threadlike extension of pia mater at the end of the spinal cord

Filum terminale

26

Collection of nerve fibers below the terminal end of the cord

Cauda Equina

27

Level of needle insertion during lumbar puncture

L4-L5

28

Location of cervical flexure

Between hindbrain and spinal cord

29

Location of cephalic flexure

Mesencephalon

30

Secondary brain vesicle origin of lateral ventricle

Telencephalon

31

Secondary brain vesicle origin of 3rd ventricle

Diencephalon

32

Secondary brain vesicle origin of Aqueduct of midbrain or Sylvius

Mesencephalon

33

Secondary brain vesicle origin of upper part of 4th ventricle

Metencephalon

34

Secondary brain vesicle origin of lower part of 4th ventricle

Myelencephalon

35

Secondary brain vesicle origin of medulla oblongata

Myelencephalon

36

Secondary brain vesicle origin of pons and cerebellum

Metencephalon

37

Secondary brain vesicle origin of Thalamus, hypothalamus, pineal body, infundibulum

Diencephalon

38

Secondary brain vesicle origin of cerebral hemispheres, basal ganglia

Telecephalon

39

Secondary brain vesicle origin of hippocampus

Telencephalon

40

Location of the pontine flexure

Between the metencephalon and myelencephalon

41

Origin of the lateral ventricles

Cavity of the cerebral hemispheres

42

Serves as the structure of communication of each lateral ventricle with the third ventricle

Interventricular foramina of Monro

43

Origin of the third ventricles

Cavity of diencephalon

44

Origin of aqueduct of sylvius

Lumen of mesencephalon

45

Connects third and fourth ventricles

Aqueduct of Sylvius

46

Origin of the fourth ventricles

Cavity of the rhombencephalon

47

3 motor nuclei groups of the myelencephalon

Medial somatic efferent: cephalic continuation of the anterior horn cells, supplies the tongue muscles

Intermediate SVE: striated muscles of pharyngeal arches

Lateral GVE: involuntary musculature of the respiratory tract, intestinal tract, and heart

48

The metencephalon forms the

Cerebellum
Pons

49

Longitudinal elevation of the alar plate of the midbrain that function as correlation and reflex center for visual impulses

Anterior (superior) colliculus

50

Longitudinal elevation of the alar plate of the midbrain that function as synaptic relay station for auditory reflexes

Posterior (inferior) colliculus

51

The hypothalamic sulcus divides the alar plate into

Thalamus and hypothalamus

52

Origin of the thalamus (__ region of __ plate)

Dorsal region of the alar plate of the prosencephalon

53

origin of the hypothalamus (__ region of __ plate)

Ventral region of the alar plate

54

Distinct protuberance on ventral surface of the hypothalamus on each side of the midline

Mamillary body

55

Neural tube defect that involves incomplete development of the vertebral arches with or without defects of the underlying neural tube

Spina bifida

56

A preventive measure for spina bifida

Taking folic acid

57

Refers to a spectrum of abnormalities in which a loss of midline structures result sin malformations of the brain and face

Holoprosencephaly (HPE)

58

A rare disorder in which large clefts occur in the cerebral hemispheres, somtimes causing a loss of brain tissue

Schizencephaly