What is the function of the Scalenus muscle?

They act as postural muscles in maintaining the position of the cervical tract or playing an active role in the movements of the neck. They can incline the neck and intervene in the first degrees of rotation of the head. A bilateral contraction of the scalene allows a neck flexion.

What is Scalenus medius?

Middle Scalene, AKA Scalenus Medius (Latin: musculus scalenus medius), is the largest and longest muscle in the scalene group of lateral neck muscles. Often penetrated by the dorsal scapular and long thoracic nerves, it is deeply placed, lying behind Sternocleidomastoid.

What is the function of the Scalenus muscle and where is it situated?

The scalene muscles are three paired muscles (anterior, middle and posterior), located in the lateral aspect of the neck. Collectively, they form part of the floor of the posterior triangle of the neck. The scalenes act as accessory muscles of respiration, and perform flexion at the neck.

What is Scalenus anterior muscle?

The anterior scalene, AKA scalenus anterior (scalenus anticus; Latin: musculus scalenus anterior) muscle is one of the lateral muscles of the neck, belonging to the scalene group. It is deeply placed, lying behind the Sternocleidomastoid. It is located between the subclavian vein and the subclavian artery.

Where is the Scalenus medius muscle located in the neck?

The scalenus medius (middle scalene) muscle is one of the three scalene muscles in the neck. origin: transverse processes of lower six cervical vertebrae (C2-C7) insertion: upper surface of first rib.

What is the function of the middle scalene muscle?

The position of the middle scalene muscle, like the anterior scalene muscle, allows it to lift, or elevate, the first rib upward and to bend the neck sideways during the inhalation of gas into the lungs. Nerves that are part of the brachial plexus — cervical nerves C3 to C8 — put this scalene muscle into action.

Is there a fourth muscle behind the Scalenus anterior?

Description. Sometimes a fourth muscle, the scalenus minimus is present behind the lower portion of the scalenus anterior. The brachial plexus and subclavian artery pass between the anterior and middle scalenes, while the subclavian vein and phrenic nerve pass anteriorly to the anterior scalene as the muscle crosses over the first rib.

Is the Scalenus medius related to the levator scapulae?

The posterolateral surface of the muscle is related to the levator scapulae and the scalenus posterior muscle. The innervation to the scalenus medius is delivered by the anterior rami of cervical spinal nerves C3-C8.