OH EXAM 1 QUESTIONS AND ANSWERS
Embryology - CORRECT ANSWER✅✅The study of prenatal development
Prenatal development - CORRECT ANSWER✅✅Begins with pregnancy and continues until the birth of
the child
Congenital malformation - CORRECT ANSWER✅✅Development disturbances that involve the protocol
structures as well as other parts of the body
Teratogens - CORRECT ANSWER✅✅Environmental agents and factors involved in causing
malformations can include infections, drugs, and radiation
zygote - CORRECT ANSWER✅✅Union of the ovum and sperm fertilized egg aka
Mitosis - CORRECT ANSWER✅✅Cell division
Implantation - CORRECT ANSWER✅✅By the end of first week, the blastocyst stops traveling and
undergoes
Down syndrome or trisomy 21 - CORRECT ANSWER✅✅Caused by an extra 21st chromosome, which
leads to developmental disabilities and distinctive facial features.
Ectopic pregnancy - CORRECT ANSWER✅✅implantation of the fertilized egg outside the uterus
Embryonic period - CORRECT ANSWER✅✅Second period of parental development, extends from the
beginning of the second week of the end of the eighth week
Embryonic disc - CORRECT ANSWER✅✅Epiblast and hypoblast form a flat structure
ectoderm, mesoderm, endoderm - CORRECT ANSWER✅✅3 primary germ layers
, Placenta - CORRECT ANSWER✅✅A prenatal organ that joins the pregnant woman and developing
embryo
Cephalic and caudal end - CORRECT ANSWER✅✅Head and tail
Fourth week - CORRECT ANSWER✅✅The face and its associated tissue begin to firm during the ____
_____ of prenatal development within the embryonic period
Stomodeum - CORRECT ANSWER✅✅primitive mouth
Brain and heart - CORRECT ANSWER✅✅Forth week face between the ____ and ____
Oral epithelium - CORRECT ANSWER✅✅Oral cavity lined with
Meckel cartilage - CORRECT ANSWER✅✅Cartilage that forms within each side of the mandibular
arch(es) and that disappears as bony mandible forms.
Frontonasal process - CORRECT ANSWER✅✅During the fourth week, also forms as a bulge of tissue but
at the most cephalic end of the embryo
Placodes - CORRECT ANSWER✅✅Rounded areas of specialized thickened ectoderm found at the
location of developing structures
Otic placodes - CORRECT ANSWER✅✅Placodes in embryo forming future internal ear
?? - CORRECT ANSWER✅✅The disintegration of the oropharyngeal membrane enlarges the
stomodeum
Embryology - CORRECT ANSWER✅✅The study of prenatal development
Prenatal development - CORRECT ANSWER✅✅Begins with pregnancy and continues until the birth of
the child
Congenital malformation - CORRECT ANSWER✅✅Development disturbances that involve the protocol
structures as well as other parts of the body
Teratogens - CORRECT ANSWER✅✅Environmental agents and factors involved in causing
malformations can include infections, drugs, and radiation
zygote - CORRECT ANSWER✅✅Union of the ovum and sperm fertilized egg aka
Mitosis - CORRECT ANSWER✅✅Cell division
Implantation - CORRECT ANSWER✅✅By the end of first week, the blastocyst stops traveling and
undergoes
Down syndrome or trisomy 21 - CORRECT ANSWER✅✅Caused by an extra 21st chromosome, which
leads to developmental disabilities and distinctive facial features.
Ectopic pregnancy - CORRECT ANSWER✅✅implantation of the fertilized egg outside the uterus
Embryonic period - CORRECT ANSWER✅✅Second period of parental development, extends from the
beginning of the second week of the end of the eighth week
Embryonic disc - CORRECT ANSWER✅✅Epiblast and hypoblast form a flat structure
ectoderm, mesoderm, endoderm - CORRECT ANSWER✅✅3 primary germ layers
, Placenta - CORRECT ANSWER✅✅A prenatal organ that joins the pregnant woman and developing
embryo
Cephalic and caudal end - CORRECT ANSWER✅✅Head and tail
Fourth week - CORRECT ANSWER✅✅The face and its associated tissue begin to firm during the ____
_____ of prenatal development within the embryonic period
Stomodeum - CORRECT ANSWER✅✅primitive mouth
Brain and heart - CORRECT ANSWER✅✅Forth week face between the ____ and ____
Oral epithelium - CORRECT ANSWER✅✅Oral cavity lined with
Meckel cartilage - CORRECT ANSWER✅✅Cartilage that forms within each side of the mandibular
arch(es) and that disappears as bony mandible forms.
Frontonasal process - CORRECT ANSWER✅✅During the fourth week, also forms as a bulge of tissue but
at the most cephalic end of the embryo
Placodes - CORRECT ANSWER✅✅Rounded areas of specialized thickened ectoderm found at the
location of developing structures
Otic placodes - CORRECT ANSWER✅✅Placodes in embryo forming future internal ear
?? - CORRECT ANSWER✅✅The disintegration of the oropharyngeal membrane enlarges the
stomodeum
