APPENDIX A Attachments and Innervation of the Muscles and Structures of the Axial Skeleton SUBCOSTAL
Attachments: Lower border of a rib near its angle and upper border of a second or third rib below Innervation to the intercostales and subcostal muscles: Intercostal nerves (T2-T12)
LEVATORES COSTARUM (LONGUS AND BREVIS)
Proximal attachments: Transverse processes of C7 to T11 Distal attachments: External surfaces of ribs Innervation: Dorsi rami of adjacent thoracic spinal nerve roots (C7-T11)
SERRATUS POSTERIOR INFERIOR
Proximal attachments: Posterior surfaces of ribs 9 to 12
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Distal attachments: Spinous processes and supraspinous ligaments T11 to L3
Innervation: Intercostal nerves (T9-T12)
SERRATUS POSTERIOR SUPERIOR Proximal attachments: Spinous processes of C6 to T3 Distal attachments: Ribs 2-5 Innervation: Intercostal nerves (T2-T5)
TRANSVERSUS THORACIS
Proximal (lateral) attachments: Internal surfaces of the sternocostal joints associated with the second (or third) through the sixth ribs Distal (medial) attachments: Ventral surfaces of the lower third of the body of the sternum and xiphoid process
