Spinalis Thoracis

Original Editor - Abbey Wright

Top Contributors - Abbey Wright

Description[edit | edit source]

Muscles of the back erector spinae group Primal.png

Spinalis Thoracis belongs to the medial column of the erector spinae (Sacrospinalis) group of muscles.

It is the most prominent and well-organised portion of the spinalis muscle with spinalis capitis and spinalis cervicis superiorly.[1] With its muscle fibres running superiorly.

Origin[edit | edit source]

Spinous processes of T11-L2.[1][2]

Insertion[edit | edit source]

Spinous processes of T2-T8.[2]

Nerve[edit | edit source]

Lateral branch of the posterior rami of spinal nerves[2]

Artery[edit | edit source]

Posterior branch of posterior intercostal artery, deep cervical artery and muscular branches of vertebral artery.[2]

Function[edit | edit source]

Spinalis thoracis works with the other spinalis and the other erector spinae muscles: longissimus and iliocostalis to produce thoracic extension as well as lateral flexion and rotation of the spine[1].

References[edit | edit source]

  1. 1.0 1.1 1.2 Spinalis muscle [Internet]. Kenhub. 2021 [cited 30 November 2021]. Available from: https://www.kenhub.com/en/library/anatomy/spinalis-muscle
  2. 2.0 2.1 2.2 2.3 Palastanga, N., & Soames, R. (2012). Anatomy and human movement (6th ed.). Edinburgh: Churchill Livingstone.