Development of organs Flashcards
Types of placenta in ca, Eq, Ru and Ho
ca: zonaria, endotheliochorial
eq: diffuse, epitheliochorial
su: diffuse, epitheliochorial
ru: cotyledonaria (multiplex), synepitheliochorial
ho: discoidea, hemochorial
What does a placentome consist of?
Fetal cotyledon + maternal caruncula
What does entoderm form?
All guts, lunge, liver
What does ectoderm form?
Skin, SNS
What does mesoderm form?
Muscles, vessels, spleen
What is the developing laryngeal orifice bordered by?
- epiglottal swelling
- arytenoid swelling
Veins opening into sinus-horns:
- v. vitellina
- v. umbilicalis
- v. cardinalis communis
- v. cardinalis cranialis
- v. cardinalis caudalis
How does laryngeal cartilages develop?
From the crista neuralis-derived mesenchyme
How does cricothyroid and laryngeal muscles develop?
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
The lung buds make the species-specific numbered…
- bronchus principalis
- bronchus lobaris
- bronchus segmentalis
- bronchus subsegmentalis
- bronchus lobularis
Developmental periods of resp.system
I. embryonic II. fetal II/1. pseudo-glandular II/2. canalicular II/3. saccular II/4. alveolar III. postnatal
What is the difference between pseudo-glandular, canalicular, saccular and alveolar periods?
-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.
