Gross Anatomy Pt1 Flashcards
Learn origins, insertions, innervations and actions of back muscles.
Trapezius origin
Medial third of nuchal line;
external occipital protuberance;
nuchal ligiment;
spinous process of c7-t12 vertebrae
Trapezius insertion
Lateral third of clavicle;
Acromin;
Spine of scapula
Trapezius innervation
Spinal accessory nerve (CN XI) (motor);
C3/C4 spinal nerves (pain AND proprioceptive)
Blood supply: superficial transverse scapular a.
Trapezius action
UPPER TRAP: elevates scapula
LOWER TRAP: depresses, adducts, and posteriorly tilts scapula
MIDDLE TRAP: adducts scapula
UPPER AND LOWER TOGETHER: adducts scapula
SCAPULA FIXED: upper trap ipsilaterally laterally flexes, contralaterally rotates head and neck; bilaterally extends head and neck
Latissimus Dorsi origin
Spinous process if t7-t12;
Thoracolumbar fascia;
iliac crest;
Inferior 3 or 4 ribs
Latissimus Dorsi Insertion
Floor of intertubercle groove of humerus
Lastissimus dorsi action
Extends, adducts, and medially rotates humerus;
Posteriorly tilts scapula
Rhomboid Major origin
Spinous process of T2-T5 vertebrae (upper thoracic vertebrae)
Rhomboid Major insertion
Medial boarder of scapula from level of spine to inferior angle
Rhomboid major innervation
Dorsal scapular nerve (C4 C5)
Blood supply: dorsal scapular a.
Rhomboid Major action
Adducts, elevates, and downwardly rotates scapula.
Stabilizes scapula on thoracic wall
Rhomboid minor origin
Nuchal ligament;
Spinous processes of C7 and T1
Rhomboid minor insertion
Medial end of scapular spine
Rhomboid minor innervation
Dorsal scapular nerve ( C4 C5 )
Blood supply: dorsal scapular a.
Rhomboid minor action
Adducts, elevates, downwardly rotates scapula
