Back Flashcards
What are the 4 superficial muscles of the back
Trapezius, latissumus dorsi, rhomboid major and minor
Action of the trapezius?
Elevate scapula, retract scapula, extend neck
Origin and insertion of trapezius
Origin = Occipital protuberance,
Spinous process of C7-T3
Spinous process of T4-T12
Insertion = lateral third of clavicle,
Superior crest of spine of scapula,
Medial end of spine of scapula
Action of latissumus dorsi
Extend shoulder
Adductor shoulder
Medial rotation
Origin and insertion of latissumus dorsi
O = T7-T12 spinous processes, posterior iliac crest and Ribs 9-12
I = intertubecular sulcus of humerus
Rhomboid major and minor action
Retract scapula
Rhomboid major origin and insertion
O = spinous processes of T2-T5
I = medial border of scapula
Rhomboid minor origin and insertion
O = Nuchal ligament, C7-T1 spinous processes
I = medial end of scapula
What are the 5 deep muscles of the back
Levator scapulae
Supraspinatus
Infraspinatus
Teres minor
Teres major
Action of levator scapulae
Origin and insertion of levator scapulae
A= elevates and adducts scapula
O = posterior tubercle of transverse processes of C1-4
I = vertebral margin of scapula
Action of supraspinatus
Origin and insertion of supraspinatus
A = Adduction of the arm
O = fossa of scapula
I = greater tuberosity of humerus
Infraspinatus action, origin and insertion
A = lateral rotation
O = fossa of scapula
I = posterior aspect of greater tuberosity of humerus
Teres minor action, origin and insertion
A = lateral rotation
O = posterior surface of scapula
I = greater tubercle of humerus
Teres major action, origin and insertion
A = extend and adductor shoulder + medial rotation
O = dorsal surface of inferior angle of scapula
I = medial lip of intertubecular groove/ succulus of humerus
5 muscles that flex the trunk
Rectus abdominis
Internal and external oblique
Psoas major and minor
