Limb Embryology X Flashcards Preview

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Flashcards in Limb Embryology X Deck (11):
1

Derivatives of Scleratome
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Chondroblasts - cartiligounous precursors of axial skeleton = vertebral bodies + interveterbral discs (notochord)

2

Derivatives of Dermatome
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Skin

3

Derivatives of Myotome
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Muscles

4

Inducing of limb buds
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Mesenchyme capped by ectoderm, appearing week 4
Divided in ventral flexors and dorsal extensors

5

Anatomical organization of limb bud v adult limbs
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.Myotomes have segmental distribution in the embryo.
most muscles are innervated by more than one spinal segment

6

To bone and skeletal muscle - origin
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Mesoderm - Somites - Dermamyotomes - Myotomes & Dermotome
Medoderm - Somites - Mesencyme - Chondroblasts - Cartilaginous precursors - bone (endochondral ossification)

7

Extremity rotation during development
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Upper limb rotates 90 laterally and Lower limb roates 90 medially

8

Anterior v posterior Brachial plexus UE
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Nerve branches of anterior division go to flexors while posterior division go to extensors
Also in leg (but turned)

9

Adult dermatome
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Significant

10

dermatomal v peripheral nerve innervation + clinical significance
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Sensory loss overlapping dermatomes can indicate lesions closer to spine
Problems can be related to peripheral nerves (Which have own pattern of cutaneous innvervation) or dermatomes

11

Dysplasia

malformation of parts of limb - Syndactyly