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Scapula Muscles

Scapular muscle and ligaments

QuestionAnswer
Serratus anterior origin Lateral parts of the 1th-8th ribs
Serratus anterior insertion Anterior surface of medial border of scapula
Serratus anterior innervation long thoracic nerve
Serratus anterior action 1. protracts scapula 2. holds scapula against the thoracic wall 3. superior rotation of the scapula
Deltoid origin lateral third of clavicle, acromion process, and spine of scapula
Deltoid insertion deltoid tuberosity
Deltoid innervation axillary nerve
Deltoid Action 1. All three simultaneously: abduct the humerus after 15 degrees to the horizontal and stabilize the shoulder 2. Anterior: flexion and medial rotation of the humerus 3. Posterior: extension and lateral rotates the humerus
Teres Major origin inferior angle of scapula (posterior surface)
Teres major insertion medial lip of intertubercular sulcus
Teres major innervation lower subscapular nerve
Teres major action adducts and medially rotates the humerus
Name the rotator cuff muscles "SITS" Supraspinatus, Infrapinatous, Teres minor, Subscapularis
Supraspinatus origin Supraspinous fossa
Supraspinatus insertion superior aspect of greater tubercle
Supraspinatus innervation suprascapular nerve
Supraspinatus action 1. Abduct the arm for the first 15 degrees 2. Tonic contraction stabilizes the glenohumeral joint
Infraspinatus origin Infraspinous fossa
Infraspinatus insertion middle aspect of the greater tubercle
infraspinatus innervation suprascapular nerve
infraspinatous action 1. tonic contraction stabilizes the glenohumeral joint 2. laterally rotates arm
teres minor origin middle part of lateral border of scapula
teres minor insertion inferior aspect of greater tubercle
teres minor innervation axillary nerve
teres minor action 1. tonic contraction stabilizes the glenohumeral joint 2. laterally rotates the arm
subscapularis origin subscapular fossa
subscapularis insertion lesser tubercle
subscapularis innervation upper and lower subscapular nerves
subscapularis action 1. tonic contaction stabilizes glenohumeral joint 2. medially rotates arm
Created by: afiahmed
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