Muscles of the Shoulder & Back, with Pictures

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Origin of deltoid?

Acromial Extremity of the clavicle and acromion and spine of scapula

Origin for pectorals major?

Clavicle, sternum, cartilages of Ribs 2-6

actions of pectoralis major?

Flexes, adducts and rotates arm medially

insertion for pectoralis major?

Greater tubercle and inter tubercle sulcus of humerus

actions of deltoid?

abducts, flexes, extends, and med/lat rotate arm.

actions of teres major?

adducts, medially rotates and extends arm at shoulder

actions of latissimus dorsi?

adducts, medially rotates and extends arm at shoulder. draws arm inferiorly and posteriorly

nerve supply for deltoid?

axillary nerve

nerve supply for teres minor?

axillary nerve

origin of coracobrachialis?

coracoid process of scapula

insertion of deltoid?

deltoid tuberosity of humerus

actions of coracobrachialis?

flexes and adducts arm at shoulder

origin for supraspinatus muscle?

from supraspinous fossa of scapula

insertion for infraspinatus muscle?

greater tubercle of humerus

insertion for supraspinatus muscle?

greater tubercle of humerus

insertion for teres minor?

greater tubercle of humerus

actions of supraspinatus muscle?

helps deltoid to abduct arm at shoulder

origin for teres major?

inferior angle of scapula

origin for infraspinatus muscle?

infraspinous fossa of scapula

insertion for latissimus dorsi?

intertubercular sulcus of humerus

insertion of teres major?

intertubercular sulcus of humerus

nerve supply for pectoralis major?

lateral & medial pectoral nerves

actions of infraspinatus muscle?

laterally rotates arm at shoulder, adducts arm

actions of teres minor?

laterally rotates, extends, and adducts arm

insertion of subscapularis ?

lesser tubercle of humerus

nerve supply for teres major?

lower subscapular nerve

actions of subscapularis?

medially rotates arm at shoulder

insertion of coracobrachialis?

mid-medial surface of humerus

origin for teres minor?

middle part of lateral (axillary) border of scapula

nerve supply for coracobrachialis?

musculocutaneous

origins for latissimus dorsi?

spines of lower 6 thoracic vertebrae, lumbar vertebrae, iliac crest via thoracolumbar fascia, sacrum, lower 3 or 4 ribs

Origin of subscapularis ?

subscapular fossa of scapula

nerve supply for infraspinatus muscle?

suprascapular nerve

nerve supply for supraspinatus muscle?

suprascapular nerve

nerve supply for latissimus dorsi?

thoracodorsal nerve

nerve supply for subscapularis?

upper and lower subscapular nerves


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