Development of organs Flashcards

1
Q

Types of placenta in ca, Eq, Ru and Ho

A

ca: zonaria, endotheliochorial
eq: diffuse, epitheliochorial
su: diffuse, epitheliochorial
ru: cotyledonaria (multiplex), synepitheliochorial
ho: discoidea, hemochorial

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2
Q

What does a placentome consist of?

A

Fetal cotyledon + maternal caruncula

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3
Q

What does entoderm form?

A

All guts, lunge, liver

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4
Q

What does ectoderm form?

A

Skin, SNS

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5
Q

What does mesoderm form?

A

Muscles, vessels, spleen

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6
Q

What is the developing laryngeal orifice bordered by?

A
  • epiglottal swelling

- arytenoid swelling

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7
Q

Veins opening into sinus-horns:

A
  • v. vitellina
  • v. umbilicalis
  • v. cardinalis communis
  • v. cardinalis cranialis
  • v. cardinalis caudalis
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8
Q

How does laryngeal cartilages develop?

A

From the crista neuralis-derived mesenchyme

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9
Q

How does cricothyroid and laryngeal muscles develop?

A

The cricothyroid muscle develops from the IV. pharyngeal arch (thus n. laryngeus cranialis innervates it),
while all the inner laryngeal muscles develop from the VI. pharyngeal arch so they supplied by n. laryngeus caudalis

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10
Q

The lung buds make the species-specific numbered…

A
  1. bronchus principalis
  2. bronchus lobaris
  3. bronchus segmentalis
  4. bronchus subsegmentalis
  5. bronchus lobularis
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11
Q

Developmental periods of resp.system

A
I. embryonic
 II. fetal
 II/1. pseudo-glandular
 II/2. canalicular
 II/3. saccular
 II/4. alveolar
 III. postnatal
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12
Q

What is the difference between pseudo-glandular, canalicular, saccular and alveolar periods?

A

-Pseudo-glandular: Bronchus segmentalis -> bronchuli terminales. Columnar epithelium+capillaries.
-Canalicular period: Pulmonary lobule -> sacculus terminalis. Columnar into cuboidal epithelium.
-Saccular period: Sacculus terminales expand and grow.
Cuboidal epithelium -> pneumocytes.
-Alveolar period: Development of sacculus alveolares. Type I alveolar pneumocyte (squamous). Type II alveolar pneumocyte (cuboidal) -> surfactant.

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