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BLOOD VESSELS

BLOOD VESSELS TO SKELETAL MUSCLE

     In Amphioxus, blood vessels reach the myosepta but not the muscle myotomes themselves and skeletal muscle receives little vascular supply (Ruppert, from Harrison, 1997, p. 458; Willey ).  In lampreys, the vascular supply of muscle is not as great as that observed in higher vertebrates (Hardisty).  As vertebrates began to develop more elaborate their skeletal muscle, the vascular supply to this muscle became more developed.   With the evolution of fins came the evolution of subclavian veins to supply them.

SHARK

SHARK

PERCH

PERCH

In tetrapods, the blood vessels of the fins in fishes continue into the limbs—the subclavian arteries and veins proceed to the axillary, brachial, and forearm vessels (such as the radial and ulnar).

SALAMANDER

SALAMANDER

TURTLE

TURTLE

OPOSSUM

OPOSSUM

OPOSSUM
OPOSSUM

CAT

CAT

CAT
CAT

MONKEY

MONKEY