Fins

Question 1

Primitive fish fins

Answer 1

Body carrying projecting spines,lobes, or processes

Fins are membranous or web processes internally strengthened by radiating thin fin rays

Question 2

What does the appendicular skeleton consist of

Answer 2

Paired fins or limbs and the girdles, the braces within the body that supports them

• shoulder pectoral girdle(which dermal and endochondral skeletal elements contribute and support the fin or limb)
• hip or pelvic girdle consisting of endochondral skeletal elements that supports the pelvic or limb

Question 3

Where do Fin rays come from

Answer 3

They form initially at the interface between dermis and epidermis

Question 4

What are ceratotrichia

Answer 4

Dermal rays
In elasmobranchs they are the dermal fin rays which are keratinized rods
(keratinized rods that radiate out like veins in a fan to internally support the fins of condrithyes and fishes)
-sharks/rays

Question 5

What are lepidotrichia

Answer 5

Fin rays

And then he fishes are usually in ossified or a condor five series of tiny elements that strengthen this web

Question 6

What is actinotrichia

Answer 6

In some bony fishes the tip of the Tip may be further stiffen by additional keratinized rods

Question 7

Pterygiophores, basals, radials

Answer 7

The proximal part of the fin close to the body is supported by PTERYGIOPHORES,(support the web of the fish fin) of the two general types
BASALS-The enlarged listen the proximal part of the fin
RADIALS-slender part that extend support from the basals into the middle region of the fin