What is the origin insertion and action of the sternocleidomastoid muscle?
Table of Contents
- 1 What is the origin insertion and action of the sternocleidomastoid muscle?
- 2 Where does the sternocleidomastoid muscle attach superiorly?
- 3 What is the insertion of the trapezius muscle?
- 4 Where does the soleus originate and insert?
- 5 What is the difference between the insertion and origin of a muscle?
- 6 What Innervates the Sternocleidomastoid?
What is the origin insertion and action of the sternocleidomastoid muscle?
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. The actions of the SCM are to flex and rotate the head. It does this by contracting both SCMs together or one alone, respectively.
What is the action of the sternocleidomastoid muscle?
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. It also acts as an accessory muscle of inspiration.
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.
What is the Sternocleidomastoid and where is it located?
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 insertion of the trapezius muscle?
Insertion. The muscle inserts on the lateral third of clavicle, acromion, and spine of scapula.
Which of the following muscles has its insertion on the sternum?
Sternalis muscle
| Sternalis | |
|---|---|
| Origin | manubrium of sternum or clavicle |
| Insertion | xiphoid process, pectoral fascia, lower ribs, costal cartilages or rectus sheath |
| Identifiers | |
| Latin | Musculus sternalis |
Where does the soleus originate and insert?
Soleus muscle
| Origin | Soleal line, medial border of tibia, head of fibula, posterior border of fibula |
|---|---|
| Insertion | Posterior surface of calcaneus (via calcaneal tendon) |
| Innervation | Tibial nerve (S1, S2) |
| Vascularization | Posterior tibial artery and vein |
| Function | Talocrural joint: Foot plantar flexion |
Where does the orbicularis oculi insert?
lateral palpebral raphe
Orbicularis oculi
| Origin | Nasal part of frontal bone, frontal process of maxilla, medial palpebral ligament, lacrimal bone |
|---|---|
| Insertion | Skin of orbital region, lateral palpebral raphe, superior and inferior tarsal plates |
What is the difference between the insertion and origin of a muscle?
A skeletal muscle attaches to bone (or sometimes other muscles or tissues) at two or more places. 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.
Which of the following is the insertion of the pectoralis major?
Pectoralis major muscle
| Origin | Clavicular part: anterior surface of medial half of clavicle Sternocostal part: anterior surface of sternum, Costal cartilages of ribs 1-6 Abdominal part: Anterior layer of rectus sheath |
|---|---|
| Insertion | Crest of greater tubercle of humerus |
What Innervates the Sternocleidomastoid?
Motor Function. The spinal accessory nerve innervates two muscles – the sternocleidomastoid and trapezius. Attachments – Runs from the mastoid process of the temporal bone to the manubrium (sternal head) and the medial third of the clavicle (clavicular head).
What is the insertion of the highlighted muscle?
24 Cards in this Set
| Identify the highlighted structure. | Teres major (note the posterior view of the specimen). |
|---|---|
| What is the origin and insertion of the highlighted muscle? | Origin: Pubic symphysis and crest Insertion: costal cartilages of ribs 5-7, xiphoid |