Page 61 - AERIAL ACROBATICS & CALISTHENICS VOL. 1 (ENG).pdf

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MUSCLES OF THE SHOULDER GIRDLE
LATISSIMUS DORSI
LEVATOR SCAPULAE
RHOMBOIDS (MAJOR AND MINOR)
TRAPEZIUS
SUBCLAVIUS PECTORALIS MAJOR PECTORALIS MINOR
SERRATUS ANTERIOR DELTOID
SUPRASPINATUS (*) SUBSCAPULARIS (*)
TERES MAJOR TERES MINOR (*)
INFRASPINATUS (*)
(*) Also known as rotator cuff
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Extension, adduction, and medial rotation of the shoulder joint.
Scapular elevation.
Scapular elevation and scapular retraction towards the spine.
Scapular elevation, depression, rotation, and retrac- tion towards the spine.
Clavicle depression and stabilization. Adduction, medial rotation, and humeral flexion.
Abduction (protraction) and depression of the scapu- la towards the thorax.
Scapular protraction (around the ribcage).
Abduction, flexion, and medial rotation of the shoul- der. Extends and laterally rotates the shoulder.
Initiates arm abduction (0 to 15 degrees). Stabilization of the head of the humerus.
Medial rotation of the arm. Shoulder joint stabilization.
Adduction and internal rotation of the arm.
External rotation of the arm. Shoulder joint stabilization.
External rotation of the arm. Shoulder joint stabilization.
NORMAL RANGE OF MOTION OF SHOULDER JOINT
Forward flexion: 180 degrees (keep in mind both glenohumeral and scapulothoracic motion work to- gether to achieve an optimal overhead alignment motion).
Abduction: 150-180 degrees (100-120 degrees from glenohumeral range of motion and 50-60 degrees from scapulothoracic motion). Keep in mind both the arm and the scapula must contribute to achieve optimal overhead alignment.
Extension: 45-60 degrees
Rotation (test with elbow flexed to 90 degrees): External Rotation: 90 degrees Total range of motion of 180 degrees
Internal rotation: 90 degrees
The sequential combination of these movements (abduction, adduction, extension and flexion) is described as circumduction. Circular movement (more precisely, conical movement) of a limb or extremity so that the distal end describes a circle while the proximal end remains fixed.
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