What action does the sternocleidomastoid muscle perform?
Rotation of
Function. 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.
What is the origin of the sternocleidomastoid quizlet?
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). It makes up the bulk of the chest muscles and lies under the breast.
Where is the sternocleidomastoid function?
The sternocleidomastoid is a superficially located neck muscle that plays an important role in tilting your head and turning your neck, as well as other things. It courses from the back of your head and attaches to your breastbone and collar bone.
What is the action of the trapezius?
The function of the trapezius is to stabilize and move the scapula. The upper fibers can elevate and upwardly rotate the scapula and extend the neck. The middle fibers adduct (retract) the scapula.
What is the origin insertion and action of the trapezius?
| Trapezius | |
|---|---|
| Origin | Medial one-third of superior nuchal line, external occipital protuberance, spinous processes of vertebrae C7-T12, Nuchal ligament |
| Insertion | posterior border of the lateral one-third of the clavicle, acromion process, and spine of scapula |
What is the origin insertion and action of the serratus anterior?
The serratus anterior (SA) is a fan-shaped muscle that originates on the superolateral surfaces of the first to eighth or ninth ribs at the lateral wall of the thorax and inserts along the superior angle, medial border, and inferior angle of the scapula.
What is the origin and insertion of the trapezius muscle?
It originates on the occipital bone, the ligamentum nuchae, and the spinous processes of T01–T12. The trapezius inserts on the lateral third of the clavicle, as well as the acromion and scapular spine of the scapula.
What is the difference between the insertion and origin of a muscle?
Muscles Attach to Bones At Locations Called Origins and Insertions. If the place is a bone that remains immobile for an action, the attachment is called an origin. If the place is on the bone that moves during the action, the attachment is called an insertion.
What is the role of the sternocleidomastoid in respiration during exercise?
The sternocleidomastoid muscle (SCM), which is responsible for the mechanical action in the majority of the head movements, is also considered an accessory muscle for respiration.
What is the origin of the trapezius?
The trapezius has multiple origin and insertion points—it’s simply too big not to. It originates on the occipital bone, the ligamentum nuchae, and the spinous processes of T01–T12. The trapezius inserts on the lateral third of the clavicle, as well as the acromion and scapular spine of the scapula.
How to stretch the sternocleidomastoid?
Stand with your feet about 4 feet apart.
Where is the sternocleidomastoid muscle?
Anatomy of the SCM. The sternocleidomastoid runs diagonally from the back of the ear to both the collarbone and the breastbone.
What can cause your sternocleidomastoid muscle to be swollen…?
Causes of pain. Most people with sternocleidomastoid pain develop the pain slowly due to a combination of lifestyle issues.
What is the origin and insertion of muscles?
Origin and insertion are two types of attachment points of skeletal muscles.