Embryology and Development — Flashcards

Flashcard 251: The optic groove appears by _____ weeks

Answer: 4 (Day 22)

Extra: The optic groove (optic sulcus) appears at approximately **day 22** of development, which is the beginning of the **4th week**. It is the first morphological sign of eye development, appearing in the neural folds of the future forebrain (prosencephalon).

Flashcard 252: Primary teeth in the upper jaw erupt _____ than their counterpart in the lower jaw

Answer: later

Flashcard 253: The _____ fontanelle is the last fontanelle to close.

Answer: anterior

Flashcard 254: Fingerprint first develops in _____ weeks of intrauterine life.

Answer: 12-16

Flashcard 255: The pericardial, pleural, and peritoneal cavities are developed from the _____

Answer: intraembryonic coelom

Flashcard 256: Which processes fail to fuse in bilateral complete cleft palate?_____

Answer: Palatine processes with each other and with the premaxilla

Flashcard 257: The fetal nucleus starts to develop by _____ month

Answer: 3

Flashcard 258: The sertoli cells are derived from the _____ of the early gonad.

Answer: surface epithelium

Flashcard 259: The sclera (superotemporal part) is formed from the _____derm

Answer: meso

Flashcard 260: The trigone on the posterior wall of the urinary bladder is formed by the incorporation of the lower ends of the _____

Answer: mesonephric ducts.