Scalene Triangle Anatomy

The innervation is carried by direct branches of the cervical and brachial plexuses c3 6. Scalenus posterior is the smallest and most deeply seated of the scalene muscles.

Thoracic Outlet Syndrome Sciencedirect

Together with the first rib these muscles form a triangle known as the scalene triangle or interscalene triangle also called the posterior scalene foramen the scalene hiatus or the scalene fissure through which the brachial plexus nerves and the subclavian artery pass.

Scalene triangle anatomy. Hereby they form a roof over the pleura and the upper thorax. The scalene muscles are subdivided into. Einthovens triangle an imaginary equilateral triangle with the heart at its center formed by the axes of the three bipolar limb leads.

Bipolar limb leads i ii and iii form einthovens triangle. The scalene muscles are an important part of the anatomy of the neck with several important structures located between and around them. Also behind the anterior scalene are the pleura of the lungs and the superior intercostal artery.

The scalene muscles latin. Ladder are three paired cervical muscles running from the cervical vertebrae to the upper two ribs. The posterior scalene latin.

The brachial plexus nerves yellow and the subclavian artery red pass through the scalene triangle while the subclavian vein blue passes in front. The scalene triangle is bound by the anterior and middle scalene muscles with the first rib at the base. The brachial plexus and subclavian artery pass between the anterior and middle scalene muscles.

It arises by two or three separate tendons from the posterior tubercles of the transverse processes of the lower two or three cervical vertebrae and is inserted by a thin tendon into the outer surface of the second rib behind the attachment of the anterior scalene.

Posterior Triangle Anatomyzone