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. Image from Human Anatomy Atlas.

What is the origin insertion and action of the trapezius?

TrapeziusOriginMedial one-third of superior nuchal line, external occipital protuberance, spinous processes of vertebrae C7-T12, Nuchal ligamentInsertionposterior border of the lateral one-third of the clavicle, acromion process, and spine of scapula

Where is the location of the trapezius muscle?

The trapezius is a large muscle in your back. It starts at the base of your neck and extends across your shoulders and down to the middle of your back. Providers call it the trapezius because of its shape. It looks like a trapezoid (a shape with four sides, two that are parallel).

What is the insertion point of the trapezius muscle?

Insertion. The muscle inserts on the lateral third of clavicle, acromion, and spine of scapula.

What is the insertion of the trapezius muscle quizlet?

Insertion:Lateral one-third of clavicle,acromion and spine of the scapula. Insertion:Lateral one-third of clavicle,acromion and spine of the scapula. You just studied 3 terms!

What 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.

What is the origin and insertion of the supraspinatus muscle?

OriginSupraspinous fossa of scapulaInsertionGreater tubercle of humerus

What is the origin of the levator scapulae?

Origin. The levator scapulae originates on the posterior tubercle of transverse process of cervical vertebrae 1 to 4.

What is the origin and insertion of the levator scapulae?

Origin and insertion Levator scapulae originates from the transverse processes of the first four cervical vertebrae. The muscle fibers descend laterally to insert at the superior angle and medial border of scapula, between the superior angle and base of the spine of scapula.

What is the origin of the rhomboid major muscle?

OriginRhomboid minor: Nuchal ligament, Spinous processes of vertebrae C7-T1 Rhomboid major: Spinous process of vertebrae T2-T5InsertionRhomboid minor: Root (medial end) of spine of scapula Rhomboid major: Medial border of scapula (from inferior angle to root of spine of scapula)

Article first time published on

What is the origin of latissimus dorsi?

Origin of the latissimus dorsi is from spinous processes of thoracic T7–T12, thoracolumbar fascia, iliac crest and inferior 3 or 4 ribs, inferior angle of scapula and insertion on floor of intertubercular groove of the humerus.

What is the origin and insertion of the deltoid?

OriginsLateral 1/3 of Clavicle (clavicular part), Acromion (acromial part), Spine of Scapula (spinal part) Mnemonic: ‘Deltoid helps you carry SACS’InsertionDeltoid tuberosity of humerusInnervationAxillary nerve (C5, C6)

How many muscles are in the trapezius?

Like most other muscles, there are two trapezius muscles — a left and a right trapezius — that are symmetrical and meet at the vertebral column. The trapezius arises from ligaments at its origins along the nuchal crest of the occipital bone and the spinous processes of the cervical and thoracic vertebrae.

What is the origin of supraspinatus quizlet?

Origin: Medial 2/3 of the supraspinatus fossa. Insertion: Superiorly on the greater tubercle of the humerus. Action: Abduction of the humerus and stabilization of the humeral head in the glenoid fossa. … Origin: subscapular fossa of the scapula.

What is the function of the trapezius muscle quizlet?

Weakness: Allows the scapula to ride upward and tilt forward, with depression of the coracoid process. If the upper trapezius is tight, it helps to pull the scapula upward and acts as an opponent to a weak lower trapezius.

What is the action of 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. The lower fibers depress and aid the upper fibers in upwardly rotating the scapula.

Does Infraspinatus abduct?

Infraspinatus is the main external rotator of the shoulder joint. It assists in producing shoulder extension. With the arm fixed, it abducts the inferior angle of the scapula.

What is the location of the supraspinatus?

The supraspinatus has associations with the other muscles of the rotator cuff, including infraspinatus, teres minor, and subscapularis. It is embryologically linked to the deltoid and works with the deltoid to perform abduction of the humerus at the glenohumeral joint.

What is the origin of the splenius capitis muscle?

OriginSpinous processes of vertebrae C7-T3, nuchal ligamentInsertionLateral superior nuchal line of occipital bone, mastoid process of temporal boneActionBilateral contraction: Extends head/neck Unilateral contraction: Lateral flexion and rotation of head (ipsilateral)

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.

Where is sternocleidomastoid muscle?

What is the SCM muscle? The sternocleidomastoid (SCM) muscle is located at the base of your skull on either side of your neck, behind your ears. On both sides of your neck, each muscle runs down the front of your neck and splits to attach to the top of your sternum and collarbone.

What is the origin of teres minor?

OriginLateral border of scapulaInsertionGreater tubercle of humerusActionShoulder joint: Arm external rotation, arm adduction; Stabilizes humeral head in glenoid cavityInnervationAxillary nerve (C5, C6)Blood supplySuprascapular artery, dorsal scapular artery

Which muscles move the glenohumeral joint and originate on the axial skeleton?

Nine muscles cross the shoulder joint to move the humerus. The ones that originate on the axial skeleton are the pectoralis major and the latissimus dorsi. The deltoid, subscapularis, supraspinatus, infraspinatus, teres major, teres minor, and coracobrachialis originate on the scapula.

What is the infraspinatus muscle?

The infraspinatus is a thick triangular muscle that occupies much of the infraspinous fossa of the scapula. It is a member of the rotator cuff, commonly remembered by the mnemonic “SITS” (supraspinatus, infraspinatus, teres minor, subscapularis).

Where is the rhomboid minor?

The rhomboid minor is a cylindrical muscle that originates at the ligamentum nuchae and C7 and T1 vertebra. It inserts at the scapula’s medial border near the base of the spine of the scapula.

Where does the dorsal scapular nerve come from?

The dorsal scapular nerve originates from the fifth cervical spinal nerve (ventral ramus) in the majority (75%) of cases, within the posterior cervical triangle deep to the prevertebral fascia. However, this nerve may also receive some contributions from C4 to T1.

Which is the origin of the serratus anterior?

Origin and insertion The serratus anterior muscle originates at the 1st to 8/9th rib and inserts at the anterior surface of the medial border of the scapula (extending from the superior to inferior angles).

What are the four rotator cuff muscles?

• Supraspinatus. This holds your humerus in place and keeps your upper arm stable. …
• Infraspinatus. This is the main muscle that lets you rotate and extend your shoulder.
• Teres Minor. This is the smallest rotator cuff muscle. …
• Subscapularis.

Which of the following muscles has a portion of its origin located on the ribs?

The origin of the pectoralis major muscle includes the anterior surface of the costal cartilages of the first six ribs.

What is the origin of the latissimus dorsi muscle quizlet?

The latissimus dorsi muscle originates on the: posterior crest of the ilium.

What is the origin of the teres major?

Origin and insertion The teres major muscle originates from the posterior surface of the inferior angle of scapula, as well as from the lower part of the lateral border of the scapula. At its origin, the muscle is easily palpated and felt like a soft tissue structure on the inferior scapular angle.