Embryology 2

Question 1

GASTRULATION and NEURULATION

Answer 1

Formation of germ layers

Formation of neural tube

Question 2

Describe the location of the Primitive streak

Answer 2

formed in the midline of the epiblast by the dipping in of cells (invagination)

Provides an axis

Question 3

Describe the 3 germ and type of disc

Answer 3

Ectoderm
Mesoderm
Endoderm

Trilaminar disc

*Gastrulation

Question 4

What remnant is the nucleous pulposis of?

Answer 4

Notochord

Question 5

What are the three parts the mesoderm separates into?

Answer 5

Paraxial, intermediate and lateral

Question 6

What does dermtome,myotome and sclerotome form?

Answer 6

Dermtome dermis of skin
Myotome muscles
Sclerotome bones including vertebrae

Question 7

Describe the 3 parts of the somite

Answer 7

Dermatome
Myotome
Sclerotome

Question 8

Describe the intermediate plate mesoderm

Answer 8

Urogenital system (kidneys, reproductive)

Question 9

Define teratology

Answer 9

Study of when things go wrong during development

Question 10

Congenital rubella

Answer 10

caused by contraction of german measles when pregnant

Question 11

Describe the 3 factors the risk posed by a teratogen depends on

Answer 11

Exposure during critical periods of development
Dosage of drug/chemical/factor
Genetic constitution of embryo ie some more susceptible than others at equivalent doses etc

Question 12

Diagnosis of malformations prenatal

Answer 12

Blood - AFP
Ultrasound scan – 12 week anomaly scan
Invasive tests: chorionic villus sampling and amniocentesis

Question 13

Diagnosis of malformations postnatal

Answer 13

Hip stability
Testes (descent)
Fingers and toes
Hearing