Inferior Serratus Spinous processes of the lower two Lower borders of the bottom four Pulls ribs down, resisting pull of T9-T12 Posterior thoracic and the upper two or three ribs diaphragm lumbar vertebrae Splenius Spinous processes of inferior cervical Mastoid process, occipital bone, Extension of the head and neck; lateral Cervical spinal and superior thoracic vertebrae and transverse processes of flexion and rotation of the head and nerves superior cervical vertebrae neck Scalenes and middle: flexes Cervical spinal elevates 1st rib, neck forward and laterally, rotates C3-C8. Anterior Transverse processes of C3-C6 1st rib neck Middle Transverse processes of C2-C7 1st rib Posterior Post: elevates 2nd rib, flexes neck laterally, slightly rotates neck Transverse processes of C4-C6 2nd rib
Inferior Serratus Posterior Spinous processes of the lower two thoracic and the upper two or three lumbar vertebrae Lower borders of the bottom four ribs Pulls ribs down, resisting pull of diaphragm T9-T12 Splenius Spinous processes of inferior cervical and superior thoracic vertebrae Mastoid process, occipital bone, and transverse processes of superior cervical vertebrae Extension of the head and neck; lateral flexion and rotation of the head and neck Cervical spinal nerves Scalenes Anterior Middle Posterior Transverse processes of C3-C6 Transverse processes of C2-C7 Transverse processes of C4-C6 1st rib 1st rib 2nd rib and middle: elevates 1st rib, flexes neck forward and laterally, rotates neck Post: elevates 2nd rib, flexes neck laterally, slightly rotates neck Cervical spinal C3-C8.
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