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Spinal Anatomy Test 1 > Day 7 > Flashcards

Flashcards in Day 7 Deck (27):
0

What embryonic structure gives rise to the somites?

paraxial mesoderm

1

what is the maximum number of somites observed during development?

38 pairs

2

How many somites will be formed during deveopment

42-44 pairs of somites

3

Name the areas of cellular differentiation formed with the somite.

sclerotome, myotome and dermatome

4

What are the names of the successive vertebral columns formed during development?

membranous, cartilaginous, skeletal or osseous

5

Migration of a somite pair to surround the notochord forms what developmental feature?

the perichordal blastema

6

The perichordal blastema gives to what processes?

neural processes and costal processes

7

What is the name of the artery located between adjacent perichordal blastemae?

intersegmental artery

8

What forms between the sclerotomites of a perichordal blastema?

the intresclerotomal fissure (fissure of von Ebner)

9

The union of a dense caudal sclerotomite and a loose cranial sclerotomite from adjacent perichordal blastemae gives rise to what feature?

the vertebral blastema

10

What vessel will be identified adjacent to the vertebral blastema?

the segmental artery

11

What is the name given to the replacement of mesoderm by cartilage?

chondrification

12

How may centers of chondrification typically appear in the vertebral blastema?

six...2 for the centrum, 2 for the neural arches, 2 for the transverse process

13

What is the earliest time that the centers of ossification appear in the cartilaginous vertebra?

during the 7th embryonic week

14

What is the ration of primary to secondary centers of ossification for a typical vertebra?

3 primary centers: 5 secondary centers

15

What are the names of the primary centers of ossification for a typical vertebra?

centrum centers and neural arch centers

16

What is the time and location for the earliest center of ossification in the typical vertebra?

centrum centers in the lower thoracics and upper lumbars during the 9-10 fetal week

17

When and where will neural arch centers of ossification first appear?

lower cervicals and upper thoracics in the 9-10 fetal week

18

What is the name given to the cartilage joint formed between the centrum and neural arch?

neurocentral synchondrosis

19

What is the direction for closure of the neurocentral synchondrosis along the spine?

cranial to caudal

20

Which location of the spine will first exhibit obliteration of the neurocentral synchondrosis?

cervicals

21

What is the name given to the cartilage joint formed between neural arch centers of ossification?

neural arch synchondrosis

22

What is the direction for closure of the neural arch synchondrosis along the spine?

caudal to cranial

23

What location of the spine will first exhibit obliteration of the neural arch synchondrosis?

lumbars

24

What are the names/locations of the five secondary centers of ossification for a typical vertebra?

tip of the transverse process, tip of the spinous process, epiphyseal plate centers

25

What is the range of appearance for secondary centers of ossification of a typical vertebra?

during puberty,typically ages 11-16 years old

26

What are the ages of appearance and the events occurring at each step in the formation of bone at the superior and inferior surface of the vertebral body?

ages 7-9 years, appearance of epiphyseal plate centers of ossification
age 12 years, formation of the epiphyseal ring
age 15 years, formation of the epiphyseal rim