What muscle abducts the shoulder at 15 degrees?

What muscle abducts the shoulder at 15 degrees?

supraspinatus muscle
The supraspinatus muscle originates from the supraspinous fossa of the scapula, passes under the acromion, and inserts on the superior facet of the greater tubercle of the humerus. It is responsible for the initiation of arm abduction and is in control of the motion up to the first 15 degrees of abduction.

What is abduction of a muscle?

Abduction is any motion of the limbs or other body parts that pulls away from the midline of the body. Swinging the hands from the side of the body up to the shoulder or higher is abduction. Any muscle that creates this type of motion is termed an abductor.

Does supraspinatus initiate shoulder abduction?

Conclusions: Supraspinatus is recruited prior to movement of the humerus into abduction but not earlier than many other shoulder muscles, including infraspinatus, deltoid and axioscapular muscles. The common statement that supraspinatus initiates abduction is therefore, misleading.

What is the supraspinatus?

Supraspinatus is the smallest of the 4 muscles which comprise the Rotator Cuff of the shoulder joint specifically in the supraspinatus fossa. It travels underneath the acromion.

What is normal shoulder abduction?

Shoulder abduction Abduction occurs when you have arm movement away from the middle of your body. When you raise your arm out from the sides of your body, it’s an abduction of your shoulder. A normal range for abduction, starting with your palms at your sides, is around 150 degrees in a healthy shoulder.

What is abduction of the arm?

In general terms, abduction in the anatomical sense is classified as the motion of a limb or appendage away from the midline of the body. In the case of arm abduction, it is the movement of the arms away from the body within the plane of the torso (sagittal plane).

What muscles abduct shoulders?

The primary muscles involved in the action of arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior.

What is a shoulder abduction?

What muscles abduct the humerus?

Muscles: supraspinatus (initiates abduction – first 15 degrees), deltoid (up to 90 degrees), trapezius and serratus anterior (scapular rotation, for abduction beyond 90 degrees). The deltoid muscle abducts the arm, but at 90 degrees the humerus bumps into the acromion.

What is a normal cervical range of motion?

The normal cervical range of motion is Flexion – 80 to 90 degrees Extension – 70 degrees Lateral flexion – 20 to 45 degrees on both sides Rotation – 90° of rotation to both sides.

Shoulder abduction. Abduction occurs when you have arm movement away from the middle of your body. When you raise your arm out from the sides of your body, it’s an abduction of your shoulder. A normal range for abduction, starting with your palms at your sides, is around 150 degrees in a healthy shoulder.

What are muscles used for shoulder abduction?

Trapezius is responsible for elevating the shoulder blade and rotating it during arm abduction.

Deltoid is responsible for flexion and medial rotation of the arm.

Pectoralis major is responsible for arm adduction and medial rotation of the arm.