A3 - Embryology (Mitchell) Flashcards Preview

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Flashcards in A3 - Embryology (Mitchell) Deck (67):
1

Envelops CNS axon

Plasma membrane of oligodendrocyte

2

Rostral neuropore closes

Day 25

3

Folding begins here

6th somite

4

Flexure where brain meets spinal cord

Cervical flexure

5

Caudal 1/3 neural tube

Spinal cord

7

Gives rise to:

Thalami, etc.

Diencephalon

8

Gives rise to:

Lower part of 4th ventricle

Myelencephalon

8

Responsible for:
Consciousness

Sensorimotor transformation

Sensory integration

Planning

Telencephalon

9

Envelops peripheral axon

Cell body of neurolemma (schwann cell)

10

Embryonic cell layer continuous with early CNS

Surface ectoderm

11

Development of neural tube

4th week

12

Wrappings lose cytoplasm

Oligodendrocyte

12

Suci and gyri develop in the human brain at this age

9 months

13

Gives rise to:

Telencephalon

Diencephalon

Forebrain (Prosencephalon)

14

Gives rise to:

Lateral ventricles

Telencephalon

14

Major relay center for hearing and vision

Midbrain (Mesencephalon)

15

Flexure where the pons develops

Pontine flexure

16

Oligodendrocytes are derivatives of _________

Neuroepithelium

16

Gives rise to:

Aqueduct

Mesencephalon

17

Alar neurons migrate to marginal zone, responsible for:

Fine touch proprioception

- Gracile & Cuneate nucleii

18

Cerebellum develops as an expansion of _____

alar plates

20

Cells that help absorb & produce CSF in central canal & ventricles

Ependymal cells

21

Produces CSF

Choroid plexus

22

Surrounds neuroectoderm

Mesenchyme

23

4th Somite

Spinal cord development

23

Membranous layer of CNS derived from neural crest

Arachnoid mater

23

Changes in reflexes in adolescents due to 

Myelination

24

Wrappings retain cytoplasm

Neurolemma (schwann cell)

24

Portion of the pituitary gland that grows from the roof of the mouth

Anterior hypophysial diverticulum

25

Gives rise to:

Medulla

Myelencephalon

26

Neurolemma (schwann cells) derived from _________

Neural crest cells

28

Layer that contains axons

Marginal layer

29

Gives rise to:

Mesencephalon

Midbrain -- actually is the mesencephalon

29

In the rostral myelencaphalon, motor nucleii are located _____ while sensory nucleii are located _____

medially

laterally

30

Gives rise to:

Pons

Cerebellum

Metencephalon

31

Layer that contains neuronal bodies

Mantle layer

31

Portion of the pituitary gland that is an outgrowth of the hypothalamus

Posterior neural hypophysial diverticulum

32

Gives whitish appearance to white matter

Myelin sheath

34

Myelination of CNS axons

Oligodendrocytes

35

Transmits signal from sensory neuron axon to somatic motor neuron

Association neuron

36

Can wrap up to 50 axons

Oligodendrocytes

37

Layer that becomes gray matter

Mantle layer

38

Gives rise to:

Upper part of 4th ventricle

Metencephalon

40

Canal within the neural tube becomes

Central canal

41

Gives rise to:

Cerebral hemispheres

Telecephalon

43

Location of sensory neurons

Outside CNS - dorsal root ganglia

44

Forms brain and spinal cord

Neural tube

45

Integrates sensory input to fine tune motor output

Cerebellum

47

Caudal neuropore closes

Day 27

49

Motor or sensory fibers myelinated first?

Motor

50

Myelination of peripheral axons

Neurolemma (schwann cells)

51

Flexure between forebrain & midbrain

Midbrain flexure

52

Cranial 2/3 neural tube

Brain

53

Divides alar and basal plates

Sulcus limitans

54

Relay station for sensory neurons

Alar plates

55

Gives rise to:

Metencephalon

Myelencephalon

Hindbrain (Rhombencephalon)

56

Cells that provide support throughout CNS

Glial cells

57

Formed from ependymal cells and overlying pia

Choroid plexus

58

Layer that becomes white matter

marginal layer

60

Walls of neural tube become

Spinal cord

61

Relay information to and from cerebral cortex

Regulates basic functions - sleep, thirs, alertness

Diencephalon

- Thalamic structures

62

Provides path for regeneration of peripheral nerves

Myelin sheath

63

Sensory neurons are derived from _______

Neural crest cells

64

Contains motor neurons

Basal plate

65

Layer that lines the central canal

Ventricular (ependymal)

66

Gives rise to:

3rd ventricle

Diencephalon

67

Closure of neuropores drives _________

Vascularization of CNS