Middle scalene
- Origin. The middle scalene muscle originates from the posterior tubercles of the transverse processes of the 2nd to 7th cervical vertebrae (C2 - C7).
- Insertion. The middle scalene inserts on the upper surface of the first rib between the anterior scalene tubercle and subclavian groove.
- Action. ...
- Innervation. ...
- Blood supply. ...
Where does the middle scalene insert?
Which is the insertion of the middle scalene? 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 origin of the middle scalene?
5 rows · Origin. The middle scalene muscle originates from the posterior tubercles of the transverse ...
Where are the scalene muscles located?
3 rows · Feb 22, 2022 · The scalene muscles are the three muscles found on each side of the neck, spanning between the ...
What does the posterior scalene attach to?
Description. 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.
Where does middle scalene muscle attach?
Origin and insertion The muscle fibres extend posterolaterally to form a tendon, which inserts into the superior border of the first rib. The insertion site is located posterior to the groove for subclavian artery and anterior to the tubercle of first rib.
Where is the middle scalene?
lateral neck musclesMiddle 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 pierces 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.Oct 22, 2021
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.
Which is the insertion of the anterior scalene?
Insertion. 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 Innervates middle scalene?
The scalene muscles are innervated by the anterior branches of the cervical spinal nerves from C3 to C8. Scalene muscles involve the cervical plexus and the brachial plexus; the collaboration between the two complexes is fundamental for the different functions of these muscles.Jul 22, 2021
What attaches to the scalene tubercle?
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.
Description
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.
Insertion
Upper surface of the 1st rib, between the scalene tubercle and the subclavian groove
Action and Function
Middle scalene can act with anterior and posterior scalene muscles or individually:
Clinically important anatomy
Interscalene triangle is the anatomical triangle formed between the scalenus anterior muscle, the scalenus medius muscle and the first rib. The space is very narrow and some structures like subclavian artery and brachial plexus pass through.
What is the scalene muscle?
The scalene muscles are an important part of the anatomy of the neck, with several important structures located between and around them. The brachial plexus and subclavian artery pass between the anterior and middle scalene muscles.
Which muscle is the largest and longest?
The middle scalene is the largest and longest of the three scalene muscles. It has several long, thin muscles bellies arising from the cervical spine, which converge into one large belly that inserts into the first rib.
Where are the scalene muscles located?
Log In. 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. In this article, we shall look at the anatomy ...
What is the brachial plexus?
Interscalene block. The brachial plexus courses between the bellies of the anterior scalene and middle scalene muscles. In upper limb surgery, the brachial plexus can be infiltrated with local anaesthetic to avoid the use of a general anaesthetic - known as an interscalene block.
Where is the anterior scalene located?
Anterior Scalene. The anterior scalene muscle lies on the lateral aspect of the neck, deep to the prominent sternocleidomastoid muscle. Attachments: Originates from the anterior tubercles of the transverse processes of C3-C6, and attaches onto the scalene tubercle, on the inner border of the first rib.
What muscles are used to elevate the first and second ribs?
The scalene muscles collectively act to elevate the first and second ribs, and in doing so they increase the intrathoracic volume. In patients with respiratory distress, the scalene muscles may be used as 'accessory muscles of respiration' to aid with breathing.