Table of Contents
- 1 How many insertions does the sternocleidomastoid have?
- 2 What is the insertion of the sternocleidomastoid muscle quizlet?
- 3 Which of the following are attachment points for the sternocleidomastoid muscle?
- 4 What artery supplies the sternocleidomastoid?
- 5 Where is the Sternocleidomastoid and where does it insert?
- 6 What are the actions of the Sternocleidomastoid?
- 7 What does the SCM attach to?
- 8 What is blood supply to Sternocleidomastoid?
How many insertions does the sternocleidomastoid have?
one insertion site
The sternocleidomastoid (SCM) muscle is a voluntary, skeletal muscle located on each side of the neck. It is a ‘two headed’ muscle, meaning it has two origin sites and one insertion site. The SCM’s origins are the sternum and clavicle and its insertion is the mastoid process behind the ear.
What is the insertion of the sternocleidomastoid muscle quizlet?
Where does the sternocleidomastoid muscle originate and insert? ORIGINATES from the external surface of the occipital bone and posterior midline of the cervical and thoracic regions. INSERTS on the lateral third of the clavicle and parts of the scapula.
Where does the sternocleidomastoid muscle attach superiorly?
Inferiorly, the muscle has two heads, tendinous sternal head attached to manubrium sterni and muscular clavicular head attached to medial third of the clavicle (clavicular head). Superiorly, muscle is attached to the mastoid process of the temporal bone and superior nuchal line of the occipital bone.
Which of the following are attachment points for the sternocleidomastoid muscle?
Like I said before, the SCM is a two-headed muscle that arises on both those bones….Sternocleidomastoid Attachments.
| Origin | Insertion |
|---|---|
| Upper part of the anterior surface of manubrium | Lateral surface of mastoid process |
| Superior border/anterior surface of medial third of clavicle | Nuchal line of occipital bone |
What artery supplies the sternocleidomastoid?
The middle third of the SCM muscle mostly receives its blood supply from 1 branch of the superior thyroid artery and the external carotid artery.
What is the insertion of the trapezius muscle?
Insertion. The muscle inserts on the lateral third of clavicle, acromion, and spine of scapula.
Where is the Sternocleidomastoid and where does it insert?
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.
What are the actions of the Sternocleidomastoid?
Rotation of the head to the opposite side or obliquely rotate the head. It also flexes the neck. When acting together it flexes the neck and extends the head. When acting alone it rotates to the opposite side (contralaterally) and slightly (laterally) flexes to the same side.
What nerve supplies the sternocleidomastoid?
The sternocleidomastoid muscle is generally considered to have nerve supply from the accessory nerve. However, the innervation pattern to the SCM is not so simple and it also receives fibers from the C2 and C3 anterior branches, as studied by Caliot et al.
What does the SCM attach to?
The sternocleidomastoid muscle is a two-headed neck muscle, which true to its name bears attachments to the manubrium of sternum (sterno-), the clavicle (-cleido-), and the mastoid process of the temporal bone (-mastoid).
What is blood supply to Sternocleidomastoid?
The main blood supply of the sternocleidomastoid muscle enters it above from branches of the superior thyroid, posterior auricular and occipital arteries. The lower third is supplied by a branch from the transverse cervical artery and at this level there are few if any musculocutaneous branches.