Musculoskeletal Embryology Flashcards Preview

Anatomy > Musculoskeletal Embryology > Flashcards

Flashcards in Musculoskeletal Embryology Deck (23):
1

Paraxial mesoderm formation

2 longitudinal columns formed from the intraembryonic mesoderm

2

Somites

segmented blocked formed from the paraxial mesoderm

3

Sclerotome

Ventromedial portion of somites thats forms the vertebrae and ribs

4

Dermatome

Dermis

5

Myotome

myoblasts (primordial cells)

6

Mesenchyme

embryonic connective tissue

7

Intramembranous bone formation

Mesenchyme forms a membranous sheath; osteoblasts/clasts form bone

8

Endochonral bone formation

Chondrocytes form bone; osteoblasts form bone while in cartilage

9

Vertebrae formation (general process)

Sclerotomes form scaffold around notochord/neural tube, chondrification, then ossification

10

Resegmentation

Dense caudal and loose cephalic halves of the sclerotome vertebral scaffolding fuse

11

What is the early structure of the vertebral arch?

Neural arch

12

What part of the intermediate disk does the notochord become?

Nucleus pulposus

13

What embryonic structure forms the annulus fibrosis?

Sclerotomes

14

What week does chondrification take place?

Week 6

15

What week does ossification take place?

Week 8

16

What two structures do myotomes split into?

Dorsal epimere and ventral hypomere

17

Dorsal epimere

Muscles of the main body axis, neck extensor muscles, vertebral/deep back muscles

18

Ventral hypomere

Cervical/ thoracic/ intercostal/ sacrococcygeal/lumbar myotomes, limb musculature

19

What do superficial dermomyotomes develop into?

Dermis of the neck and trunk

20

Hemivertebra

Only half of the vertebrae form resulting in scoliosis

21

Spina bifida

Imperfect fusion of the vertebral arches

22

Spina bifida occult

Lumbar arch is not fully formed, tuff of overlaying hair is a typical finding

23

Spina bifida cystic

Neural tube fails to close, resulting in cord and/ or meninges protruding