33-hour chick embryo

Question 1

The anterior-most part with paired lateral evaginations called optic vesicles.

Answer 1

Prosencephalon

Question 2

T/F: The anterior neuropore is closed.

Answer 2

False, the anterior neuropore is the open or unfused neural tube

Question 3

Middle part with very thick walls and shaped like a vase.

Answer 3

Mesencephalon

Question 3

Lowermost part of the brain (hindbrain), prominent parated by a slight constriction along its length.

Answer 3

Rhombencephalon

Question 3

Most posteriorly located below and between the neural folds. Seen as mass of cells or dark area.

Answer 3

Primitive streak

Question 4

Paired straight “lines” below the myelencephalon. It is found below and above the heart. It extends midway to the most posterior segment.

Answer 4

Spinal cord

Question 5

Swollen end of the spinal cord which appeared to enclose the notochord and primitive streak of the embryo.

Answer 5

Sinus rhomboidalis

Question 6

A small c-shaped structure seen on the left side only. May be seen lying between the atrium and ventricle, adjacent to the last neuromere of the myelencephalon.

Answer 6

Auditory vesicle

Question 7

Somites are differentiated into these parts:

Answer 7

Epimere/segmented mesoderm, mesomere, & hypomere

Question 8

Type of somite: Blocks of mesoderm lateral to the spinal cord.

Answer 8

Epimere or segmented mesoderm.

Question 9

Type of somite: Middle portion of the somite.

Answer 9

Mesomere

Question 10

Type of somite: Most lateral portion of the somite.

Answer 10

Hypomere

Question 11

It is usually concealed by the rhombencephalon in dorsal view. Shaped like a reverse C protuding on the right side of the embryo.

Answer 11

Heart

Question 12

The anterior buldging part of the heart continuous with the short and narrow Bulbus Cordis or Conus Arteriosus.

Answer 12

Ventricle

Question 13

Posterior part of the heart continuous with sinus venosus and receives the right and left omphalomesenteric veins.

Answer 13

Atrium

Question 14

Stout vessels directly connected to sinus venosus and posteriorly to the vitelline veins.

Answer 14

Omphalomesenteric veins

Question 15

Paired vessels lopped around the foregut and connecting the dorsal aorta and the ventral aorta.

Answer 15

Aortic arches

Question 16

Paired blood vessels which convey yolk from the yolk sac to the embryo. It is connected to the omphalomesenteric veins.

Answer 16

Vitelline veins and vitelline arteries.

Question 17

A network of fine vessels located in the area vasculosa vitellina.

Answer 17

Vitelline plexus

Question 18

A dense circular vessel on the peripheral margin of area vasculosa. These vessels become connected with the vitelline vessels.

Answer 18

Sinus terminalis