T9 Nerve Root (T9)

Authors

Affiliations

Nate Yomogida, PT, DPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, PT, DPT

Doctor of Physical Therapy

B.A. in Neuroscience

Figure 1: Nerve roots extending from the spinal cord¹

Motor Innervation

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Muscle	Origin	Insertion	Innervation	Action
Iliocostalis cervicis	Ribs 3-7	C4-C6 TP	Spinal nn. Posterior rami (lateral br.) C8 - L1	Bilateral: Extends spine Unilateral: Spine ipsilateral sidebend
Iliocostalis lumborum	Sacrum Iliac crest Thoracolumbar fascia (posterior layer)	Ribs 6-12 Upper lumbar TP Thoracolumbar fascia (posterior layer)	Spinal nn. Posterior rami (lateral br.) C8 - L1	Bilateral: Extends spine Unilateral: Spine ipsilateral sidebend
Iliocostalis thoracis	Ribs 7-12	Ribs 1-6	Spinal nn. Posterior rami (lateral br.) C8 - L1	Bilateral: Extends spine Unilateral: Spine ipsilateral sidebend
Rectus abdominis				Trunk: Flexion Abdomen: Compression Pelvic: stabilization

Dermatome

Figure 2: Dermatomal cutaneous distribution¹

Figure 3: Dermatomal cutaneous distribution (Posterior)¹

References

1.

Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/