Deep Cervical Artery
Highest Intercostal Artery
There are two primary branches of the Costocervical Trunk. The Deep Cervical artery (frequently a large artery) enters the interval between the semispinalis capitis and cervicis muscles by passing between the transverse process of C7 and the neck of the first rib. The deep cervical artery supplies the posterior neck muscles. The Highest Intercostal artery supplies the first two intercostal spaces.