Embryology — Flashcards

Flashcard 421: What congenital abnormality arises due to hyperplasia of the frontonasal prominence?_____

Answer: Orbital hypertelorism

Flashcard 422: During which week of gestation is the bilaminar disc (of epiblast and hypoblast) formed?_____

Answer: Week 2

Flashcard 423: The embryonic basal plate gives rise to _____ (motor or sensory) derivatives

Answer: motor

Flashcard 424: On which days following fertilization is the morula formed?_____

Answer: 3-4

Flashcard 425: _____ uterus is a common anomaly of the uterus due to incomplete resorption of the septum

Answer: Septate

Flashcard 426: What is the embryonic origin of the parathyroid gland and parafollicular C cells? _____

Answer: Parathyroids: Endoderm (3rd & 4th pharyngeal pouches) Parafollicular C cells: Neural crest

Flashcard 427: Tracheal cartilage is derived embryologically from _____.

Answer: splanchnic mesoderm

Extra: The internal lining (epithelium and glands) of the larynx, trachea, and bronchi is derived from **endoderm**.\n\nThe cartilaginous, muscular, and connective tissue components (including the tracheal rings) are derived from **splanchnic (visceral) mesoderm**.

Flashcard 428: What week does the vitelline duct normally obliterate? _____

Answer: Week 7

Flashcard 429: What is the embryonic origin of the **conotruncal** endocardial cushions and the **aorticopulmonary septum**?

Answer: Neural crest cells

Flashcard 430: What is the most common renal fusion anomaly?

Answer: Horseshoe kidney