Iliocostalis Thoracis O, I, A
Origin: Superior borders of the angles of the lower six ribs, medial to the proximal tendon of the iliocostalis lumborum
Insertion: Superior borders of the angles of the upper six ribs and the posterior aspect of the transverse process of C7
Actions: Extension of the thoracic spine, lateral flexion of the thoracic spine
Innervation: Dorsal primary rami of T1 to T12
Blood Supply: Dorsal rami of the posterior intercostal arteries
Primary Actions of the Iliocostalis Thoracis
1. Extension of the thoracic spine when acting bilaterally
Agonists:
- Iliocostalis Cervicis
- Iliocostalis Lumborum
- Longissimus Cervicis
- Longissimus Thoracis
- Spinalis Thoracis
- Semispinalis Cervicis
- Semispinalis Thoracis
Antagonists:
- Rectus Abdominis
2. Lateral flexion of the thoracic spine when acting unilaterally
Agonists:
- Iliocostalis Cervicis
- Iliocostalis Lumborum
- Longissimus Cervicis
- Longissimus Thoracis
- External Oblique
- Internal Oblique
Antagonists: Same muscles on contralateral side
- Iliocostalis Cervicis
- Iliocostalis Lumborum
- Longissimus Cervicis
- Longissimus Thoracis
- External Oblique
- Internal Oblique
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Information about cause and effect of iliocostalis thoracis pain: Iliocostalis Thoracis Muscle: Back, Chest and Lower Abdominal Pain
An excellent book for those beginning the study of anatomy. Coloring helps memory retention.
For intermediary anatomy students learning skeletal and muscle structure.
For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!