Longissimus Thoracis
Original Editor - Oyemi Sillo
Lead Editors - Oyemi Sillo and Kim Jackson
Contents
Description
Longissimus Thoracis belongs to the intermediate column of the Sacrospinalis group of muscles.[1]
Origin
The common broad, thick tendon with Iliocostalis Lumborum, fibers from the transverse and mamillary processes of the lumbar vertebrae and lumbrosacral aponeurosis[2]
Insertion
The tips of transverse process of all thoracic vertebrae and the lower 9 or 10 ribs between the tubercles and angles [2]
Nerve Supply
Dorsal rami of thoracic and lumbar spinal nerves (T7 to L5) [3]
Blood Supply
Dorsal branches of the posterior intercostal arteries from the thoracic aorta. [3]
Action
- acting unilaterally, extension of vertebral column and flexion to the same side
- acting bilaterally, extension and hyperextension of vertebral column[2]
Function
Draws ribs down to help with breathing[3]
References
- ↑ Gray, Henry. Anatomy of the Human Body. Philadelphia: Lea & Febiger, 1918; Bartleby.com, 2000. www.bartleby.com/107/.
- ↑ 2.0 2.1 2.2 http://www.wheelessonline.com/ortho/longissimus_thoracis_1
- ↑ 3.0 3.1 3.2 http://www.anatomyexpert.com/app/structure/5230/
