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Anatomy > TBL 3 > Flashcards

TBL 3 Flashcards

1
Q

Skeletal muscle germ layer

A

paraxial mesoderm

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2
Q

Cardiac muscle germ layer

A

visceral/splanchnic lateral plate mesoderm

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3
Q

Smooth muscle germ layer

A
  • visceral/splanchnic lateral plate mesoderm

- Exception: pupillary, mammary gland, sweat glands

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4
Q

When do myoblast cells fuse to form myotubes?

A

Week 5

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5
Q

When do myofibrils form?

A

end of 3rd month

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6
Q

Embryologic origin of tendons

A

sclerotomes

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7
Q

Mesoderm forms all but what type of tissue?

A

nervous

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8
Q

Axial mesoderm becomes…

A

notochord

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9
Q

Paraxial mesoderm forms what first?

A

somitomeres–commit to cellular pathway

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10
Q

compacted somitomeres become…

A

somites

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11
Q

When do somites begin to form?

A

week 3-4

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12
Q

Somites differentiate into what 3 regions?

A

sclerotome, myotome, dermatome

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13
Q

When do somites differentiate in sclerotomes, myotomes, and dermatomes?

A

week 4-5

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14
Q

Sclerotomes form…

A
  • axial skeleton
  • ribs
  • vertebrae
  • some skull bones
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15
Q

Myotomes form…

A
  • skeletal muscle

- migrate to location

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16
Q

Dermatomes form…

A

-dermis of skin dorsally and laterally

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17
Q

Intermediate mesoderm form…

A

connective tissue, smooth muscle, epithelium of…

  • urinary system
  • genital system
18
Q

Splanchnic lateral plate mesoderm forms….and covers…

A
  • Forms all of cardiovascular system

- covers endoderm tube

19
Q

Somatic lateral plate mesoderm forms…

A

under ectoderm ventrally

20
Q

Role of somites

A

Formation of myotome and the somitic frontier

21
Q

Ventrolateral and dorsomedial cells of the somite migrate which direction?

A

ventrally

22
Q

What is the lateral somitic frontier?

A

separates the somite from the parietal lateral plate mesoderm

23
Q

The primaxial domain forms _____ from _____

A

myotome; somite

24
Q

Primaxial domain forms around….

A

neural tube

25
Q

In the primaxial domain, what gives developmental signals for muscle formation?

A

neural tube and notochord

26
Q

The primaxial domain produces…. (5)

A
  1. Scalenes
  2. Intercostals
  3. Rhomboids
  4. Levator scapulae
  5. Latissumus dorsi
27
Q

The abaxial domain consists of what type of cells?

A

migrated somitic ventrolateral cells

28
Q

In the abaxial domain, what gives developmental signals for muscle formation?

A

lateral plate mesoderm

29
Q

Epaxial muscles form____ and are innervated by _____

A

intrinsic back muscles; dorsal rami of spinal nerves

30
Q

Hypaxial muscles form _____ and are innervated by _____

A

body wall and limb muscles; ventral rami of spinal nerves

31
Q

Upper limb myotomes

A

C3-T1

32
Q

Lower limb myotomes

A

L1-S2

33
Q

Myogenic cells that form muscles migrate to ______ first

A

pharyngeal arches

34
Q

Arch 1

A

CN V, muscle of mastication

35
Q

Arch 2

A

CN VII, muscle of facial expression

36
Q

Arch 3

A

CN IX, stylopharyngeus muscle

37
Q

Arch 4/6

A

CN X, muscle of soft palate, pharynx, larynx

38
Q

Cardiac muscle germ layer origin

A

splanchnic lateral plate mesoderm

39
Q

Large artery germ layer origin

A

lateral plate mesoderm and NCC

40
Q

Coronary artery germ layer origin

A

proepicardial cells and NCC

41
Q

Gut wall and derivatives germ layer origin

A

splanchnic lateral plate mesoderm

42
Q

pupil/mammary/sweat gland germ layer origin

A

ectoderm

Anatomy (2 decks)

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