Shoulder Complex and Brachial Muscles Flashcards
What is the proximal attachment of the trapezius?
External Occipital Protuberance
Superior Nuchal Line
Ligamentum Nuchae
Spinous process; CV7, TV1-12
What is the distal attachment of the trapezius?
Lateral 1/3 of clavicle
Acromion and crest of scapular spine
Tubercle of scapular spine
What innervates the trapezius?
CN XI (accessory nerve)
Ventral Rami C3-C4
What is the blood supply of the trapezius?
Dorsal Scapular Artery
What are the actions of the trapezius?
Elevates, depresses scapula, adducts, and upwardly rotates
What is the proximal attachment of lattisimus dorsi?
Spines of TV7-12
Lumbar/sacral vertebrae via thoracolumar fascia
Posterior iliac crest
Ribs 9-12
What is the distal attachment of the lattisimus dorsi?
Floor of intertubercular (bicipital) groove
What are the actions of the lattisimus dorsi?
Extends, adducts, and internally rotates humerus
What innervates the lattisimus dorsi?
Thoracodorsal nerve
What is the blood supply for the lattisimus dorsi?
Subscapular artery via the the throacodorsal artery
What is the proximal attachment for the levator scapulae?
Transverse process of CV1-4
What is the distal attachment for the levator scapulae?
Medial border of scapula at and above the spine
What are the actions of the levator scapulae?
Elevates scapula at superior angle
Assists in external/downward rotation
What innervates the levator scapulae?
C3-C5 (Dorsalscapular Nerve for C5)
What is the blood supply for the levator scapulae?
Dorsal scapular artery
What is the proximal attachment for the rhomboids?
Ligementum nuchae
Spines of CV7, TV1-4
What is the distal attachment of the rhomboids?
Medial border of scapula from spine to the inferior angle
What are the actions of the rhomboids?
Adducts scapula
External/downward rotation of glenoid fossa
Fixes scapula to thoracic wall
What innervates the rhomboids?
Dorsal scapular nerve
What is the blood supply of the rhomboids?
Dorsal scapular artery
What is the proximal attachment of the teres major?
Posterior inferior angle of scapula
What is the distal attachment of the teres major?
Medial lip of intertubercular (bicipital) groove
What are the action of the teres major?
Adducts and medically rotates the humerus
What innervates the teres major?
Lower subscapular nerve