Question 2

2. The vertebral artery is the most important branch of the subclavian artery. It ascends through the upper six cervical foramina to enter the foramen magnum where it joins with the vertebral artery from the opposite side to form the basilar artery anterior to the pons. Which structure divides the subclavian artery into three parts?
a. Pectoralis minor
b. Teres Major
c. Scalenus Anterior
d. Scalenus medius
e. First rib