What is the function of the Spinotrapezius?
| Muscle | Origin | Action |
| Clavotrapezius | Skull, Cervical Vertebrae | Move clavicle anteriorly |
| Acromiotrapezius | Cervical, Thoracic Vertebrae | Support/rotate scapula |
| Spinotrapezius | Thoracic Vertebrae | Support/rotate scapula |
| Latissimus dorsi | Lumbar Fascia Thoracic Vertebrae | Retract arm |
What is the Spinotrapezius?
The word "spinotrapezius" refers to the human trapezius, although it is not commonly used in modern texts. In other mammals, it refers to a portion of the analogous muscle. Similarly, the term "tri-axle back plate" was historically used to describe the trapezius muscle.
How does the trapezius rotate the scapula?
In addition to scapular translation, the trapezius induces scapular rotation. The upper and lower fibers tend to rotate the scapula around the sternoclavicular articulation so that the acromion and inferior angles move up and the medial border moves down (upward rotation).
What does the trapezius muscle do?
The trapezius is a large paired trapezoid -shaped surface muscle that extends longitudinally from the occipital bone to the lower thoracic vertebrae of the spine and laterally to the spine of the scapula. It moves the scapula and supports the arm .
What is trapezius palsy and how is it treated?
Trapezius palsy, due to damage of the spinal accessory nerve, is characterized by difficulty with arm adduction and abduction, and associated with a drooping shoulder, and shoulder and neck pain. Intractable trapezius palsy can be surgically managed with an Eden-Lange procedure .
Where is the Spinotrapezius on a cat?
Spinotrapezius, also called thoracic trapezius, is the most posterior of the three. It is triangular shaped. Posterior to the acromiotrapezius and overlaps latissimus dorsi on the front.
What is the action of the Clavotrapezius?
Its origin is the superior nuchal line and median dorsal line and its insertion is the clavicle. Its action is to draw the clavicle dorsally and towards the head.
What is the function of the latissimus dorsi in a cat?
CardsTerm ClavobrachialisDefinition Origin: Clavicle Insertion: Proximal end of ulna Function: Draws humerus craniadTerm Latissimus DorsiDefinition Origin: Lumbodorsal fascia and neural spines of last thoracic and lumbar vertebrae Insertion: Medial side of humerus Function: Elevates the arm and draws it caudad122 more rows•Mar 2, 2010
What does the Spinodeltoid do?
Insertion - Outer surface of spinodeltoid. Action - Flexes and rotates humerus. Origin - Thoracic and lumbar vertebrae.
Do humans have a Clavotrapezius?
clavotrapezius, acromiotrapezius, spinotrapezius – three muscles in cat, one muscle in human (trapezius).
What muscle extends and adducts arm?
The thick and flat teres major is inferior to the teres minor and extends the arm, and assists in adduction and medial rotation of it. The long teres minor laterally rotates and extends the arm. Finally, the coracobrachialis flexes and adducts the arm.
Where is the latissimus dorsi?
Relations. The latissimus dorsi muscle is found superficially in the lower two-thirds of the trunk, covering the serratus posterior muscles. The teres major muscle lies superior to latissimus dorsi. The adjoining fibers of these two muscles are united, but separated by a bursa towards their humeral attachments.
Which of the following is a primary action of the latissimus dorsi muscle?
The latissimus dorsi is responsible for extension, adduction, transverse extension also known as horizontal abduction (or horizontal extension), flexion from an extended position, and (medial) internal rotation of the shoulder joint. It also has a synergistic role in extension and lateral flexion of the lumbar spine.
How do you remember the latissimus dorsi?
The actions of the latissimus dorsi are easy to remember if you can remember that it's the handcuff muscle. If you were being arrested and handcuffed (and I hope you never are), your arms would be medially rotated, a little bit extended and also adducting across the midline behind you.
Where is the Spinodeltoid?
Spinodeltoid - This is the most posterior muscle of the deltoid group. It originates on the spine of the scapula, to which it runs parallel, and inserts on the humerus. It is readily identified by its rectangular shape and its relationship to the surrounding muscles.
What is the action of supraspinatus?
As part of the Rotator Cuff, supraspinatus helps to resist the gravitational forces which act on the shoulder joint to pull from the weight of the upper limb downward. It also helps to stabilize the shoulder joint by keeping the head of the humerus firmly pressed medially against the glenoid fossa of the scapula.
What muscle do you use to turn your head?
sternocleidomastoidThe major muscle that laterally flexes and rotates the head is the sternocleidomastoid. In addition, both muscles working together are the flexors of the head. Place your fingers on both sides of the neck and turn your head to the left and to the right.
trapezius muscle
Neck and back muscle. Origin: occipital bone (superior nuchal line), nuchal ligament, spinous processes of vertebrae C7-T12. Insertion: posterior edge of lateral clavicle, acromion, posterior edge of spine of scapula. Nerve: accessory (CN XI), spinal C3-C4. Action: elevates, retracts, and rotates scapula.
trapezius muscle
A large, triangular back muscle extending from the lower part of the back of the skull (occiput) almost to the lumbar region of the spine on each side. Each muscle extends outward from the rear processes of the vertebral column to the spine of the shoulder blade and the outer tip of the collar bone (clavicle).
What is the function of the trapezius muscle?
Its main function is to stabilize and move the scapula.
Which muscle is connected to the spinous processes?
At the middle, the muscle is connected to the spinous processes by a broad semi-elliptical aponeurosis, which reaches from the sixth cervical to the third thoracic vertebræ and forms, with that of the opposite muscle, a tendinous ellipse. The rest of the muscle arises by numerous short tendinous fibers.
How to develop trapezius?
The upper portion of the trapezius can be developed by elevating the shoulders. Common exercises for this movement are any version of the clean, particularly the hang clean, and the shoulder shrug. Middle fibers are developed by pulling shoulder blades together. This adduction also uses the upper/lower fibers.
What is the name of the muscle that resembles a trapezium?
Name and History. The trapezius muscle resembles a trapezium (trapezoid in American English), or diamond-shaped quadrilateral. The word "spinotrapezius" refers to the human trapezius, although it is not commonly used in modern texts. In other mammals, it refers to a portion of the analogous muscle.
Which fibers rotate the scapula around the sternoclavicular articulation?
In addition to scapular translation, the trapezius induces scapular rotation. The upper and lower fibers tend to rotate the scapula around the sternoclavicular articulation so that the acromion and inferior angles move up and the medial border moves down (upward rotation).
Where are the middle fibers of the trapezius located?
The middle fibers, or transverse of the trapezius arise from the spinous process of the seventh cer vical (both in the back of the neck), and the spinous processes of the first, second, and third thoracic vertebrae. They are inserted into the medial margin of the acromion, and into the superior lip of the posterior border of the spine ...
Where does the trapezius originate?
The superior or upper (or descending) fibers of the trapezius originate from the spinous process of C7, the external occipital protuberance, the medial third of the superior nuchal line of the occipital bone (both in the back of the head), and the ligamentum nuchae.
