Embryology and Development — Flashcards

Flashcard 91: _____ nucleus is the innermost nucleus formed at around 1-3 months of gestation

Answer: Embryonic

Flashcard 92: In the development of a female, the _____ duct degenerates and the paramesonephric (mullerian) duct develops

Answer: mesonephric (wolffian)

Flashcard 93: The _____ period of lung development occurs from weeks 26 to birth

Answer: saccular

Flashcard 94: The _____ occipital and the last five to seven coccygeal somites later disappear.

Answer: first

Flashcard 95: The _____ is a remnant of the obliterated umbilical vein

Answer: ligamentum teres hepatis (round ligament of the liver)

Flashcard 96: The flexure occurring in the region of the _____ (midbrain) is called the cephalic (mesencephalic) flexure.

Answer: mesencephalon

Extra: Three flexures develop in the embryonic brain: 1. **Cephalic (Mesencephalic) flexure**: A ventral bend occurring in the region of the **midbrain** (mesencephalon). 2. **Cervical flexure**: A ventral bend occurring at the junction of the **hindbrain** (rhombencephalon) and the **spinal cord**. 3. **Pontine flexure**: A dorsal bend occurring between the **metencephalon** and the **myelencephalon**.

Flashcard 97: The flexure between the _____ and the spinal cord is called as the cervical flexure.

Answer: myelencephalon

Flashcard 98: _____ defects occur due to failure of rostral fold closure of the anterior abdominal wall

Answer: Sternal

Flashcard 99: _____ nucleus is formed from 3 months of gestation till birth

Answer: Fetal

Flashcard 100: DiGeorge syndrome is a developmental failure to develop the _____ and 4th pharyngeal pouches

Answer: 3rd