Deltoid- del�toyd
O: Lateral of the clavicle, Acromion process, and spine of
the scapula
I: Deltoid tuberosity of the humerus
A: All Fibers: Abducts the shoulder, Anterior
Fibers: Flexes, internally rotates, and horizontally adducts the
shoulder, Posterior Fibers: Extends, externally rotates, and
horizontally abducts the shoulder
Pectorals Major- pek-tor-al-us ma�jor
�Pectoral� Chest, �Major� Larger
O: Medial clavicle, sternum, and the costal cartilages of
ribs 1-7
I: Lateral lip of the bicipital groove of the humerus **has a
distinct twist to maintain leverage for all the fibers.**
A: All Fibers: Horizontally adducts the shoulder,
Clavicular Fibers: Flexes the shoulder, Costal
Fibers: Extends the shoulder from overhead position
Corocobrachialis- Kor�a-ko-bra-ke-al�is
�Coracro�
Coracoid process, �Brachialis� arm
O: Coracoid process of the scapula
I: Medial shaft of the humerus
A: Flexes the shoulder and Adducts the shoulder
Biceps Brachii -bi�seps bra�ke i
�Biceps� two heads,
�Brachii� arm
O: Long Head: Supraglenoid tubercle of the scapula
O: Short Head: Coracoid process of the scapula
I: Radial tuberosity and bicipital aponeurosis
Actions:
Long Head: Flexes and abducts the shoulder and forearm
Short Head: Flexes and Adducts the shoulder and
forearm Supinates the forearm
Pectoralis Minor- pek-tor-al-us mi�nor
�Pectoris�
Chest, �Minor�
Smaller
O: Ribs 3-5
I: Coracoid process of the scapula
Actions:
Protracts and Depresses the scapula Elevates ribs
3-5 (expanding of the ribcage)
Trapezius- Tra pe�ze us
O: Entire Muscle: Occiput, nuchal ligament and
Spinous processes of C7-T12
I: Lateral one-third of the clavicle, acromion process, and the
spine of the scapula
Actions:
Entire Muscle: Retracts the scapula
Upper Fibers: Elevates and upwardly rotates the
scapula Lower Fibers: Depresses and upwardly rotates the
scapula
Ipsilaterally: Extends and laterally flexes the head and
neck to the same side
Contralaterally: Rotates the head and neck to the opposite
side
Levator Scapula- Le va�tor skap� yu le
�Levator�
raiser
�Scapula�
Shoulder blade
O: Transverse processes of C1-C4
I: Superior angle of the scapula
A: Elevates and downwardly rotates the scapula, Ipsilaterally:
Extends, laterally flexes, and rotates the neck to the same side
Rhomboid Major and Minor- Rom boyd ma�jor; Rom boyd mi�nor
�Rhombos�
rhombus (a geometric shape), �Oid�
resemblance
O: Major: Spinous processes T2-T5
O: Minor: Spinous processes of C7-T1
I: Medial border of the scapula from the root of the spine to the
inferior angle
Actions:
Retracts, elevates, and downwardly rotates the scapula
Latissimus Dorsi- la tis�i mus dor�si
�Latissimus�
wide
�Dorsi�
back
O: Spinous processes of T7-L5, posterior iliac crest and
posterior sacrum
I: Medial lip of the bicipital groove of the humerus
A: Adducts, horizontally abducts, extends, and internally rotates
the shoulder
Teres Major- Ter�ez ma�jor
�Teres�
round,
�Major�
large
O: Posterior surface of the Inferior angle of the scapula
I: Medial lip of the bicipital groove of the humerus
Actions:
Adducts, extends, and internally rotates the shoulder
Serratus Anterior- Ser a�tus an te�re or
O: Lateral surfaces of upper 8 or 9 ribs
I: Costal surface of medial border of the scapula
A: Protracts, depresses, and upwardly rotates the scapula
Supraspinatus- su pra spi na�tus
�Supra�
above,
�Spina�
spine (of the scapula)
O: Supraspinous fossa of the scapula
I: Greater tubercle of the humerus
A: Initiates abduction of the shoulder
Infraspinatus- in�fra spi na�tus
�Infra�
below,
�Spina�
spine (of the scapula)
O: Infraspinous fossa of the scapula
I: Greater tubercle of the humerus
A: Externally rotates, extends, and horizontally abducts the shoulder
Teres Minor- ter�ez mi�nor
�Teres�
round,
�Minor�
small
O: Superior lateral border of the scapula
I: Greater tubercle of the humerus
A: Externally rotates, extends, and horizontally abducts the shoulder
Subscapularis- sub�skap yu la�ris
�Sub�
under,
�Scapula�
shoulder blade
O: Subscapular fossa of the scapula
I: Lesser tubercle of the humerus
A: Internally rotates the shoulder
Triceps Brachii- tri�seps bra�kei
�Triceps�
three heads,
�Brachii�
arm
O: Long Head: Infraglenoid tubercle of the scapula
O: Lateral Head: Proximal of posterior shaft of the humerus
O: Medial Head: Distal of the posterior shaft of the humerus
I: Olecranon process of the ulna
Actions:
Extends the elbow (Main action)
Long Head: Extends and adducts the shoulder