Hy Embryology 13 Part 3

Front 1

Describe the secondary brain vesicles

Back 1

The five secondary brain vesicles develop during week 6 and form various adult derivatives of the brain

Front 2

What are the adult derivatives of the telencephalon?

Back 2

1. Cerebral hemispheres
2. Caudate
3. Putamen
4. Amygdaloid claustrum
5. Lamina terminalis
6. Olfactory bulbs
7. Hippocampus

Front 3

What are the adult derivatives of the diencephalon?

Back 3

1. Epithalamus
2. Subthalamus
3. Thalamus
4. Hypothalamus
5. Mamillary bodies
6. neurohypophysis
7. Pineal gland
8. Globus pallidus
9. Retina
10. Iris
11. Ciliary body
12. Optic nerve (CN II)
13. Optic chiasm
14. Optic tract

Front 4

What are the adult derivatives of the mesencephalon?

Back 4

Midbrain

Front 5

What are the adult derivatives of the metencephalon?

Back 5

1. Pons
2. Cerebellum

Front 6

What are the adult derivatives of the Mylencephalon?

Back 6

Medulla

Front 7

What does the spinal cord develop from?

Back 7

The neural tube

Front 8

Describe the alar (sensory) plate

Back 8

1. Is a dorolateral thickening of the intermediate zone of the neural tube

2. Gives rise to motor neuroblasts of the ventral and lateral horns

3. Projects axons from motor neuroblasts, which exit the spinal cord and become the ventral (motor) roots

4. The basal plate eventually becomes the dorsal horn of the spinal cord

Front 9

What does the alar plate eventually become?

Back 9

The dorsal horn of the spinal cord

Front 10

Describe the basal (motor plate)

Back 10

1. Is a ventrolateral thickening of the intermediate zone of the neural tube

2. Gives rise to motor neuroblasts of the ventral and lateral horns

3. Project axons from motor neuroblasts, which exit the spinal cord and become the ventral (motor plate)

4. The basal plate eventually becomes the ventral horn of the spinal cord

Front 11

What does the basal plate eventually become?

Back 11

The ventral horn of the spinal cord

Front 12

What does the basal plate give rise to?

Back 12

Motor neuroblasts of the ventral and lateral horns

Front 13

What does the alar plate give rise to?

Back 13

Sensory neuroblasts of the dorsal horn

Front 14

What is the dorsolateral thickening of the intermediate zone of the neural tube?

Back 14

The alar (sensory) plate

Front 15

What is the ventrolateral thickening of the intermediate zone of the neural tube?

Back 15

The basal (motor) plate

Front 16

Describe the Sulcus Limitans

Back 16

1. The sulcus limitans is a longitudinal groove in the lateral wall of the neural tube that appears during week 4 of development and separates the alar and basal plates

2. Extends from the spinal cord to the rostral midbrain

Front 17

Where does the sulcus limitans extend?

Back 17

From the spinal cord to the rostral midbrain

Front 18

When does the sulcus limitans appear?

Back 18

Week 4 of development

Front 19

What is the longitudinal groove in the lateral wall of the neural tube that appears during week 4 of development and separates the alar and basal plates

Back 19

Sulcus limitans

Front 20

Describe the caudal eminence

Back 20

1. Arises from the primitive streak and blends with the neural tube

2. Gives rise to sacral and coccygeal segments of the spinal cord

Front 21

From where does the caudal eminence arise?

Back 21

Arises from the primitive streak and blends with the neural tube

Front 22

What arises from the primitive streak and blends with the neural tube?

Back 22

Caudal eminence

Front 23

What does the caudal eminence give rise to?

Back 23

Sacral and coccygeal segments of the spinal cord

Front 24

Describe myelination of the spinal cord

Back 24

1. Begins during month 4 in the ventral (motor) roots

2. Oligodendrocytes accomplish myelination in the CNS and Schwann cells accomplish myelination in the PNS

3. Myelination of the corticospinal tracts is not completed until the end of 2 years of age

4. Myelination of the association neocortex extends to 30 years of age

Front 25

When does myelination of the spinal cord begin?

Back 25

Month 4

Front 26

From where does myelination of the spinal cord begin?

Back 26

The ventral (motor) roots

Front 27

When does myelination of the corticospinal tracts complete?

Back 27

Until the end of 2 years of age

Front 28

When does myelination of the association neocortex complete?

Back 28

The myelination of the association neocortex extends to 30 years of age

Front 29

Where does the spinal cord extend to by week 8 of development?

Back 29

The length of the vertebral canal

Front 30

When does the spinal cord extend to the length of the vertebral canal?

Back 30

Week 8 of development

Front 31

Where does the conus medullaris extend to by birth?

Back 31

The conus medullaris extends to the level of the third lumbar vertebra (L3)

Front 32

When does the conus medullaris extend to the level of the third lumbar vertebra (L3)?

Back 32

By birth

Front 33

Where does the conus medullaris terminate in adults?

Back 33

The L1-L2 interspace

Front 34

What does disparate growth between the vertebral column and the spinal cord result in?

Back 34

1. Disparate growth between the vertebral column and the spinal cord results in the formation of the cauda equina, consisting of dorsal and ventral roots, which descends below the level of the conus medullaris

2. Disparate growth results in the nonneural filum terminale, which anchors the spinal cord to the coccyx

Front 35

Describe the formation of the cauda equina

Back 35

Cauda equina results from the disparate growth between the vertebral column and the spinal cord and consists of the dorsal and ventral roots. The cauda equina descends below the level of the conus medullaris

Front 36

Describe the development of nonneural filum terminale

Back 36

Results from disparate growth between the vertebral column and the spinal cord