Anatomy Lab 3

Question 1

Area Pellucida

Answer 1

• 18hr chick
• lighter central area of the blastodisc, which includes the primitive streak and other embryonic structures.
• It appears relatively light because it overlies the subgerminal cavity; the thin blastodisc is the only tissue on this part of the slide.

Question 2

Area Opaca

Answer 2

• 18hr chick
• the darker area around the outside of the area pellucida
• Here the blastodisc is directly adjacent to the yolk. When the blastodisc is removed some of the underlying yolk remains attached, giving it a darker appearance

Question 3

Primitive streak

Answer 3

• 18hr chick
• line through the center
• at its maximum length, beginning to recede back towards the posterior marginal zone

Question 4

Notochord (18hr chick)

Answer 4

• Formed by recession of the primary streak and knot

- It begins to stimulate the formation of the neural plate and somites

Question 5

Neural plate (18hr chick)

Answer 5

-beginning to form cranial to the primitive knot

Question 6

Cranial Intestinal poratl

Answer 6

• 24hr chick

- at the caudal end of the foregut, moves caudally as thing progress