development of the muscular system Flashcards
Ventromedial part of paraxial mesoderm
sclerotome
Dorsolateral part of paraxial mesoderm
» Dermatome
» Myotome
Mesenchyme
embryonic connective tissue
-from Sclerotome
Intramembranous ossification
Mesenchyme → bone
Endochondral ossification
Mesenchyme → cartilage
→bone
Hyaline cartilage
Chondrification centers →
prechondrocytes → chondroblasts →
chondrocytes
process of forming vertebral column
Caudal 1⁄2 of sclerotome “A”
fuses with the cephalic 1⁄2 of
sclerotome “B”
what are the vertebra components?
– Caudal dense part
– Cephalic loose part
Nucleus pulposus
– Notochord expands to form the
nucleus pulposus
– Mucoid substance
Annulus fibrosus
– Fibrous tissue from sclerotome
– Fibrocartilage
ribs
– Sclerotome cells that grow out from costal processes of thoracic vertebrae • Costal cartilage also from sclerotome
sternum
– Develops in the somatic
lateral plate mesoderm
thoracic outlet syndrome
presence of a cervical rib
-brachial plexus can be compressed and subclavian artery can compress blood flow
pectus carinatum
- sternum protrusion
- “pigeon chest”
pectus excavatum
“funnel chest”
sternum depression
- can compress and shift heart
- have exercise intolerance