What muscles laterally rotate the shoulder?
The infraspinatus and teres minor both aid in lateral, or external, rotation of the arm at the shoulder.
Which muscles of the shoulder girdle laterally rotate the humerus?
Named for their locations, the supraspinatus (superior to the spine of the scapula) and the infraspinatus (inferior to the spine of the scapula) abduct the arm, and laterally rotate the arm, respectively.
What are the movements of the shoulder girdle?
Movements of the shoulder girdle Movements of the humerus at the glenohumeral joint include: flexion, extension, abduction, adduction, lateral rotation, and medial rotation.
What type of joint is shoulder lateral rotation?
Synovial ball and socket joint
|Type||Synovial ball and socket joint; multiaxial|
|Blood supply||Anterior and posterior circumflex humeral, circumflex scapular and suprascapular arteries|
|Movements||Flexion, extension, abduction, adduction, external/lateral rotation, internal/medial rotation and circumduction|
How many rotator cuff muscles laterally rotate the arm?
All four rotator cuff muscles work together to centralize your humerus bone in the shoulder joint. When you lift your arm up, your rotator cuff muscles pull the joint together, stabilizing your shoulder.
What muscles lift the arm laterally?
Rotator cuff muscles
- Supraspinatus is responsible for beginning the upward motion of your arm.
- Infraspinatus mainly helps the rotation of your arm away from the center of your body.
- Teres minor helps with the lateral rotation of your arm.
What are the 4 bones in the shoulder girdle?
INTRODUCTION. The shoulder girdle is made up of four articulations (sternoclavicular, acromioclavicular, glenohumeral, and scapulothoracic) and three bones (clavicle, scapula, and humerus).
What are girdle muscles?
The five muscles that comprise the function of the shoulder girdle are the trapezius muscle (upper, middle, and lower), levator scapulae muscle, rhomboid muscles (major and minor), serratus anterior muscle, and pectoralis minor muscle.
What is shoulder girdle?
A pectoral girdle, also referred to as the shoulder girdle, connects your upper limbs to the bones along the axis of your body. You have two pectoral girdles in your body. The pectoral girdle consists of the two bones that make up your shoulder: clavicle, or collarbone. scapula, or shoulder blade.
Is the shoulder girdle a joint?
The shoulder girdle is a complex of 5 joints that can be divided into two groups. 3 of these joints are true anatomical joints, while 2 are physiological (“false”) joints.