Set A Mock Exam

• A: Identify the structure being pointed: Hensen's node

  B: What is the opening of "A"?: Primitive pit

  C. What is the homologue of "A" in amphibians?: Dorsal Blastopore Lip

  D: Name one (1) morphogenetic movement in this stage: invagination or delamination or involution or epiboly

  
• A: Give the closest age-approximation of the specimen: 24 hours

  B: Identify the structure being pointed: Somite

  C: What structure gives rise to "B"?: Segmental Plate Mesoderm

  D: The spaces between "B" are supplied by which blood vessels?: Intersegmental Artery

  
• A: Identify the structure being pointed: Primitive groove

  B: The thickened structures lateral to "A" are called __: Primitive folds

  C: What structure refers to the point where cells ingress to form the endoderm, creating a pit-like structure?: Primitive pit

  D. True/False: As the embryo develops, the number of somites increases.: True

  
• A: Identify the structure being pointed: Area pellucida

  B: The darker region lateral to "A" is referred to as __: Area opaca

  C: The difference in the coloration of "A" and "B" is due to the variation of which factor?: Cell density

  D: True/False: The cloaca is the site where fertilization of the egg by sperm typically occurs in a chick: False

  
• A: Identify the structure being pointed: Optic vesicle

  B: What is the name of the opening that can be found anterior of "A"?: Cranial neuropore

  C: The blood islands in this image are found in which region?: Area vasculosa

  D: What structure in a chick embryo will give rise to the urinary system?: Intermediate mesoderm

  
• A: Identify the structure being pointed: Ventricle or heart

  B: What is the function of "A"?: Supply and pump blood to the body

  C: The network of blood vessels surrounding the embryo are referred to as __: Vitelline Veins / Artery / Blood Vessels

  D: Give the closest age-approximation of the specimen: 48 hours

  
• A: Identify the structure being pointed: Otic Vesicle

  B: The brain region closest to "A" is _: Myelencephalon

  C: What ganglion is situated closest to "A"?: Acousto-Facialis ganglion

  D: True/False: Isthmus separates the mesencephalon and diencephalon: False

  
• A: Identify the structure being pointed: Allantois

  B: Give one (1) function of "A": Gas exchange and waste storage

  C: "A" is derived from which structure?: Hindgut

  D: The blood islands are located in which embryonic region?: Area vasculosa

  
• A: Identify the structure being pointed: Foregut

  B: Identify the structure below "A": Oral membrane

  C: "A" is derived from which germ layer?: Endoderm

  D: True/False: The blastodisc serves as a nutrient reserve for the developing embryo: False

  
• A: Identify the structure being pointed: Head mesenchyme

  B: Identify the dark-ring like structure found at the center of the image: Neural tube

  C: The cavity of "B" is called _: Neurocoel

  D: Birds produce eggs with a large amount of yolk. This type of egg is referred to as _: Telolecithal

  
• A: Identify the structure being pointed (yellow bracket): Somatopleure

  B-C: "A" is made up of which two structures: Somatic mesoderm and Ectoderm

  D: The chick embryo undergoes a partial cleavage of the egg, which means cell division only occur in a portion of the egg. This type of cleavage is referred to as _: Meroblastic

  
• A: Identify the structure being pointed (yellow bracket): Splanchnopleure

  B-C: "A" is made up of which two structures: Splanchnic mesoderm and Endoderm

  D: True/False: The blastoderm is a single-layered disc of cells on the egg yolk surface: False

  
• A: Identify the structure being pointed: Hensen's node

  B: Identify the depression located above "A": Primitive groove

  C: Identify the elevated regions lateral of "B": Primitive fold

  D: The main characteristic of avian gastrulation is the formation of which structure?: Primitive streak

  
• A: Identify the structure being pointed: Infundibulum

  B: What brain vesicle is observed in the specimen?: Prosencephalon

  C: "A" will give rise to which adult chicken structure?: Pituitary gland

  D: What morphogenetic movement involves the unfolding of cell sheet into the embryo?: Invagination

  
• A: Identify the structure being pointed: Stomodeum

  B: What brain vesicle is observed in the specimen?: Mesencephalon

  C: "A" will give rise to which adult chicken structure?: Mouth / Oral cavity

  D: Which morphogenetic movement involves the movement of cells from the epiblast to the primitive streak during gastrulation?: Ingression

  
• A: Identify the structure being pointed: Notochord

  B: Identify the structure traversed by the arrow: Foregut

  C: "A" is derived from which germ layer?: Mesoderm

  D: True/False: The neural tube is formed from the mesoderm layer: False

  
• A: Identify the structure being pointed: Heart / Ventricle

  B: What is the brain vesicle observed in the specimen?: Rhombencephalon

  C: The cavity surrounding "A" is referred to as the __: Pericardial cavity

  D: What is the term for the stage of chick embryo development when the primitive streak forms: Gastrulation

  
• A: Identify the structure being pointed by the black arrow: Endocardium

  B: Identify the structure being pointed by the white arrow: Epimyocardium

  C: "A" and "B" make up which chick embryo structure?: Heart / Ventricle

  D: What structure gives rise to the somites?: Segmental Plate Mesoderm

  
• A: Identify the structure being pointed: Semilunar ganglion

  B: "A" is usually associated with which sensory vesicle?: Otic vesicle

  C: Give one (1) flexure observed in the specimen: Cranial / Cervical / Pontine Flexure

  D: At what stage is the fertilized egg when it is laid?: Blastulation