Lecture 5

Question 1

The axial skeleton:

Answer 1

support main axis of body and includes notochord, vertebral column, ribs, sternum and gastralia

Question 2

The appendicular skeleton:

Answer 2

supports appendages for locomotion and includes bones of fins, limbs and their girdles.

Question 3

Both skeletal groups function as:

Answer 3

1. structural support and protection for post-cranial body

2. serves as sites for muscle attachment

Question 4

embryologically the skeleton originates from what?

Answer 4

mesoderm of somites which develop from epimere.

Question 5

what is the ancestral plan for axial support in vertebrata?

Answer 5

is a notochord with pared neural and hemal arches, lacking vertebral bodies.

Question 6

because life on land is not buoyant the vertebrate needs to become?

Answer 6

stronger