KH 2220 Laura Abbott, MS, LMT

1. KH 2220Laura Abbott, MS, LMT Day 8 Muscles of the Spine: Spinalis, Longissimus,Iliocostalis, Multifidus, Rotatores

2. Erector Spinae - Spinalis • This is the narrow medial column of the erector spinae muscle and is relatively insignificant. • It arises from the common origin and extends from the spinous processes in the superior lumbar and inferior thoracic regions to the spinous processes in the superior thoracic region. • It may also be divided into three parts (spinalis thoracis, spinalis cervicis, and spinalis capitis).

3. Erector Spinae - Longissimus • This is the intermediate column of the erector spinae muscle and it arises from the common origin and is attached to the transverse processes of the thoracic and cervical vertebrae, and the mastoid process of the temporal bone of the skull. • This gives this muscle a herringbone appearance. • The longissimus can also be divided into three parts according to the regions it traverses. • Longissimus thoracis inserts into the tips of the transverse processes of all of the thoracic vertebrae, and into the tubercles of the inferior nine to ten ribs; longissimus cervicis extends from the superior thoracic transverse processes to the cervical transverse processes; the longissimus capitis arises in common with the cervical part and attaches to the mastoid process of the temporal bone.

4. Longissimus

5. Erector Spinae - Iliocostalis • This is the lateral column of the erector spinae and it arises from the common origin and inserts into the angles of the ribs. • It may be divided into three parts according to the region involved. • Iliocostalis lumborum is attached to the inferior six ribs; iliocostalis thoracis is attached to all the ribs; and iliocostalis cervicis is attached to the superior six ribs and the posterior tubercles of C4 to C6 vertebrae.

6. I • Like • Spaghetti • Iliocostalis • Longissimus • Spinalis

7. Actions of the Erector Spinae • Acting bilaterally, all three columns of the erector spinaeextend the head and part or all of the vertebral column. • Acting unilaterally, the erector spinaelaterally flexes the head or the vertebral column. • In addition, the longissimuscapitis muscle rotates the head so that it is turned to the same side. • The erector spinae muscles are the chief controller of flexors of the vertebral column. • They straighten the flexed column and can bend it posteriorly. They also "pay out" (release) during its flexion so that the movement is slow and controlled.

8. Multifidus • O: Transverse process of one vertebrae • I: spinous process of all vertebrae extending from 2-4 vertebrae higher • A: bilaterally extends vertebral column; unilaterally rotate vertebral bodies (column) to opposite side and lateral flexion to same side

9. Rotatores • O: transverse process of one vertebra • I: spinous process of vertebra 1-2 above • A: rotate to opposite side; bilateral extension