Musculoskeletal Derivatives

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___-> ___-> ___-> Scleretomes + Myotomes + Dermatomes
- Mesoderm ->
- Paraxial Mesoderm ->
- Somites
Scleretomes -> (2)
- Vetebrae
- Ribs
Myotomes ->

Muscle
Dermatomes -> (2)
- Corium
- Subcutis of skin
-> Appendicular Skeleton

Somatic Mesoderm
What contributes to facial bones
- Pharyngeal Arch Mesoderm
- Neural Crest Cells
General Steps of Intramembranous Ossification (3)
- Mesenchymal cells
- Osteoblasts + Matrix
- Mineralization
General Steps of Endochondral Ossification (6)
- Mesenchymal ->
- Chrondroblasts + matrix ->
- Hyaline Cartilage ->
- Calcifiction->
- BVs ->
- Osteoblasts
Sites from which bone develops (4):
- Scleretome
- Somatic Mesoderm
- Pharyngeal Arch Mesoderm
- Neural Crest Cells
Bone Development Abnormality:

Chondrodystrophy
Chondrodystrophy-

Premature cassation of bone growth due to abnormal interstitial growth of cartilage
Medial part of Somites ->

Scleretomes
General Process of Vertebrae Formation
- Scleretome cells surround neural tube and notochord
- Scleretomes split and reunite
-> Ribs

Segemental Sclerotome
-> Sternum

Somatic Mesoderm
Ossificated occurs at day:
Rads Performed at day:
- ossificaton: 28
- Rads: 46
-> Anulus Fibrosus

Mesenchyme of Sclerotome
-> Nucleus Propulsus

Notochord
Inner & Outter parts of Intervertebral disk
- Inner: Nucleus Pulpoes (jelly)
- Outter: Annulus Fibrosus (fibrous)
-> Skeletal Mesoderm

Paraxial Mesoderm
-> Cardiac and Smooth Muscle

Splanchnic Mesoderm
Somites -> skeletal muscle located within (3):
- Axial skeleton
- Body wall
- Limbs
Somitomeres -> Muscles located within:

head
Epimeres are innervated by:

Dorsal Rami of Sinal Nerves
Epimere ->

Epaxial Muscles
Hypomeres are innervated by:

Ventral Rami of Spinal Nerves
Hypomeres ->
- Lateral and Ventral FLEXORS of thoracic and abdominal musculature
- (Hypaxial mm)
Limb Field-

Area of somatopleure committed to forming a limb
Limb Bud-

Localized Proliferation of mesoderm, covered by mesoderm
Limbs grow from...

outside body wall somatopleure
-> Bone, Cart and CT of the limbs

Somatic Mesoderm
How does the Dermis and Skeletal Muscle of Limbs form?

Dermatome and Scleretome migrations into the limb
Limbs develops in a ___ to ___ order

Proximo-distal
(1)-> AER -> (3)
Ectoderm
- Epidermis
- Nails
- Hair
Meromelia-

absence of 1+ limb parts
Micromelia

reduced size
Bimelia

plartial/complete duplication
Bones that form the base of the skull

Chondrocranium
Bones that form the vault of the skull

Desmocranium
Bones that form the face

Vicerocranium
->chondrocranium

occipital somites
chondrocranium -> (3)
- Sphenoid
- Ethmoid
- Temporal
- (petrous part)
-> Desmocranium

Neural Crest Cells
Desmocranium (4)->
- Parietal
- Frontal
- Interparietal
- Temporal
-> Viscerocranium

Mesenchyme of pharyngeal Arches
Viscerocranium (10)->
- Lacrimal
- Nasal
- Incisive
- Maxilla
- Vomer
- Palatine
- Pterygoid
- Zygomatic
- Mandible
- Temporal
Whic part of the skull develops from endochondral ossification?

Chondrocranial

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Author

HLW

39086

Card Set

Musculoskeletal Derivatives

Description

Musculoskeletal

Updated

2010-10-02T16:39:19Z

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