Subclavian artery

The video tutorial explains the subclavian arteries, which are major arteries in the thorax that supply oxygenated blood to the thorax, head, neck, shoulders, and arms. It details the five branches of each subclavian artery: the vertebral artery, internal thoracic artery, thyrocervical trunk, costocervical trunk, and dorsal scapular artery. A mnemonic, 'vitamin C&D', is introduced to help memorize these branches.

What is the role of the internal thoracic artery as a branch of the subclavian artery?

Explain the significance of the mnemonic 'C&D' in relation to the subclavian arteries.