Longissimus Thoracis Origin
Dorsal sacrum, median sacral crest, posterior superior iliac spine, & transverse processes L1-L5
Longissimus Cervicis Origin
Transverse processes of T1-T4
Longissimus Capitis Origin
Transverse processes of C4-T4
Longissimus Thoracis Insertion
Transverse process T1-T12 & the dorsal aspect of ribs 3-12
Longissimus Cervicis Insertion
Transverse processes of C2-C6
Longissimus Capitis Insertion
Posterior edge of the mastoid process
Actions
- Bilateral contraction: extension of trunk and neck
- Unilateral contraction: lateral flexion of the trunk and the neck
Innervation
- Lateral branches of the corresponding spinal nerves’ posterior rami
Blood Supply
- Vertebral artery, deep cervical artery, occipital artery, transverse cervical artery, superior intercostal artery, posterior intercostal artery, subcostal artery, lateral sacral artery, & median sacral artery
Would you like to learn more about the longissimus muscle? Then check out the longissimus muscle article and video by clicking the link below: Longissimus Muscle Anatomy
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