The middle scalene arises from the posterior tubercles of the transverse processes of the lower six cervical vertebrae. It descends along the side of the vertebral column to insert by a broad attachment into the upper surface of the first rib, posterior to the subclavian groove.

What is the insertion of the anterior scalene?

By a narrow, flat tendon attaches into the scalene tubercle on the inner border of the first rib, and into the ridge on the upper surface of the rib in front of the subclavian groove.

What pierces the middle scalene?

The posterior scalene and levator scapulae muscle are situated posterolateral to the middle scalene. The first two roots of the long thoracic nerve and the dorsal scapular nerve pierce the middle scalene and emerge on its lateral surface.

Which of the following is an action of the middle scalene?

Function. The action of the anterior and middle scalene muscles is to elevate the first rib, they also flexes and laterally bends the neck to same side. The action of the posterior scalene is to elevate the second rib and tilt the neck to the same side.

What is the insertion of the scalenus medius?

The Scalenus medius, the largest and longest of the three Scaleni, arises from the posterior tubercles of the transverse processes of the lower six cervical vertebrae, and descending along the side of the vertebral column, is inserted by a broad attachment into the upper surface of the first rib, between the tubercle

Where do the Scalenes insert?

Origin and insertion The muscle takes an inferior, almost vertical, course towards the thoracic cage. It gives off a single flat tendon, that inserts onto the scalene tubercle and superior border of first rib, just anterior to the groove for subclavian artery.

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What does the scalene muscles attach to?

The scalene muscles are located deep in relation to the sternocleidomastoid muscle, lateral to the cervical spine, connecting the vertebrae to the first two ribs. The deep fascia or prevertebral fascia envelop the scalene muscles.

Where does the middle scalene pass through?

Middle scalene It descends along the side of the vertebral column to insert by a broad attachment into the upper surface of the first rib, posterior to the subclavian groove. The brachial plexus and the subclavian artery pass anterior to it.

What passes through the scalene gap?

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

Which is the origin of the middle scalene?

The middle scalene muscle originates from middle portion of the first rib to the transverse processes of the 6th to 3rd vertebrae. It is located dorsally from the ventral scalene muscle.

What is the function of the Scalenes quizlet?

Terms in this set (3) Elevation of the second rib, and ipsilateral lateral flexion of the neck.

Which of the following is an action of the posterior scalene quizlet?

Which of the following is an action of the posterior scalene? You might passively flex your partner’s neck and ask him to breathe deeply into his upper chest when palpating which muscle tissue? The anterior scalene lies partially deep to the lateral edge of which muscle?

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Do Scalenes rotate the neck?

Conclusions: All 3 scalene muscles produce rotation of the cervical spine to the same side. Maximum stretching of the scalenes should include rotation to the opposite side.

Where is the origin of the sternocleidomastoid?

Sternocleidomastoid Attachments It originates on the anterior surface of the manubrium, and the superior border and anterior surface of the medial third of the clavicle. The SCM converges into one point and inserts on the lateral surface of the mastoid process and the nuchal line of the occipital bone.

Which muscle attaches to the scalene tubercle?

First rib. The scalene tubercle is a small projection that runs along the medial border of the first rib between two grooves, which travel anteriorly for the subclavian artery and posteriorly for the subclavian vein. It projects outward medially, and is the site of insertion for scalenus anterior, and scalenus medius.

What are the names of the two heads of the SCM?

It arises by two heads: a medial rounded and tendinous sternal head (SH) a lateral fleshy clavicular head (CH).

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