costotransverse foramen

cos·to·trans·verse fo·ra·men

an opening between the neck of a rib and the transverse process of a vertebra, occupied by the costotransverse ligament.
Synonym(s): foramen costotransversarium [TA]
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References in periodicals archive ?
After emerging from the transverse process of the axis (C2), the vertebral artery (VA) flexes posteriorly and laterally towards the atlas (C1) costotransverse foramen, forming the suboccipital segment, which contours the posterior arch of C (15).