Trunk Patterns

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Last updated 10:26 PM on 10/4/26
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22 Terms

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trunk

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appendages

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head

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“tube within a tube” design

gut tube inside of the embryo

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notochord (chordamesoderm)

Signals embryonic cells with development


<p>Signals embryonic cells with development</p><p></p>
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Neural tube/crest

Tube: becomes CNS— multipolar motor & preganglionic neurons

Crest: Psudounipolar & postganglionic neurons

<p>Tube: becomes CNS— multipolar motor &amp; preganglionic neurons</p><p>Crest: Psudounipolar &amp; postganglionic neurons</p>
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Somites

each “lump” along the back is a somite— they’re paired tissue blocks (30 pairs)

<p>each “lump” along the back is a somite— they’re paired tissue blocks (30 pairs)</p>
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dermatome

skin

<p>skin</p>
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sclerotome

skeletal bone tissue —> becomes bones of the axial skeleton

<p>skeletal bone tissue —&gt; becomes bones of the axial skeleton</p>
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myotome

Purple: epimere —> epaxial muscles of the back

Red: hypomere —> hypaxial muscles (the rest)

<p>Purple: epimere —&gt; epaxial muscles of the back</p><p>Red: hypomere —&gt; hypaxial muscles (the rest)</p>
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5 bones formed post-migration

1 = vertebral body

2, 3 = vertebral arch

4, 5 = costal element (rib)

<p>1 = vertebral body</p><p>2, 3 = vertebral arch</p><p>4, 5 = costal element (rib)</p>
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<p></p>


epaxial muscles

<p>epaxial muscles</p>
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hypaxial muscles

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ventral musculature

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Supracostal or outermost muscle

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External muscle

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middle muscle

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Internal muscle

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Subvertebral musculature

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What muscles does the anterior ramus go to?

hypaxial muscles

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What muscles does the posterior ramus go to?

epaxial muscles

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where do segmental veins and arteries go?

along the same path as the anterior ramus

—> follows somite migration around

<p>along the same path as the anterior ramus</p><p> —&gt; follows somite migration around</p>