T12 Vertebrae

Authors

Affiliations

Nate Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Muscles of the Iliac and Anterior femoral regions¹

Transverse process

There is no transverse costal facet on T12 since the T

Anterior Malalignment

Due to the iliopsoas (psoas major and minor) attachment to the anterior aspect of L1, an overactive iliopsoas can result in an anterior translation of the vertebrae.

Table 1: Psoas Major and Minor OIAN

Muscle	Origin	Insertion	Innervation	Action
Psoas Major	T12-L4 and associated IV discs L1-L5 TP	Lesser Trochanter	Lumbar Plexus Direct Br. L1 - L3	Hip: Flexion, ER L/S (unilateral contraction with femur fixed): I/L spine sidebend L/S (bilateral contraction): Raises trunk from supine position
Psoas Minor	T12, L1 vertebrae (lateral aspect) and IVD	Pectineal Line Iliopubic ramus Iliac fascia Inguinal ligament	Spinal nn. L1 - L3	Trunk: Weak flexion

References

1.

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