Fig. 1From: Musculoskeletal diagnostic ultrasound imaging for thickness measurement of four principal muscles of the cervical spine -a reliability and agreement studyUltrasound image of the longus colli at C6 in transverse view to the left behind the carotid artery, and to the right longitudinal where measurements were taken. The caliper is placed on the midpoint of the ventral surface of the C6 vertebral body and the interface between the Lcol and the pre-fascial tissue surrounding the carotid arteryBack to article page