Muscles of the Back and Shoulder Flashcards
Trapezius
Origin: Occipital bone, cervical and thoracic vertebrae
Insertion: Clavicle, acromion, and spine of scapula
ACTION: Fixates scapula; elevates, adducts, & rotates scapula
Latissimus Dorsi
Origin: T6 - L5 & iliac crest
Insertion: Medial lip of intertubercular groove of humerus
ACTION: Extension & adduction of arm; medial rotation of arm
Serrated Anterior
Origin: Ribs 1 - 9
Insertion: Vertebral border of the scapula
ACTION: Abducts & fixates scapula; elevates ribs
Levator Scapulae
Origin: C1 - C4 transverse process
Insertion: Vertebral border of scapula
ACTION: Elevates scapula
Rhomboideus Major
Origin: T2 - T5 spinous processes
Insertion: Vertebral border of scapula (below spine of scapula)
ACTION: Adducts, rotates, & fixates scapula
Rhomboideus Minor
Origin: C7 - T1 spinous processes
Insertion: Vertebral border of the scapula (above spine of scapula)
ACTION: Adducts, rotates, and fixates scapula
Teres Major
Origin: Axillary border of scapula
Insertion: Later lip of Intertubercular groove of humerus
ACTION: Extension & adduction of arm
Teres Minor
Origin: Axillary border of scapula
Insertion: Greater tubercle of humerus
ACTION: External (lateral) rotation of arm
Infraspinatus
Origin: Infraspinous fossa of scapula
Insertion: Greater tubercle of humerus
ACTION: External (lateral) rotation of arm
Supraspinatus
Origin: Supraspinous fossa of scapula
Insertion: Greater tubercle of humerus
ACTION: Abduction of arm
Subscapularis
Origin: Subscapular fossa of scapula
Insertion: Greater tubercle of humerus
ACTION: Internal (medial) rotation of arm
Erector Spinae
Origin:
Insertion:
ACTION: Extension & lateral flexion of back
Transversospinalis
Origin:
Insertion:
ACTION: Various movements of the vertebral column
Deltoideus
Origin: Clavicle, acromion, & spine of scapula
Insertion: Deltoid tuberosity of humerus
ACTION: Abduction of arm
