Scapular and Deltoid Regions Flashcards
What are the components of the axial skeleton vs. the appendicular skeleton?
Axial includes cranium, vertebral column, ribs & sternum
Appendicular includes clavicles, scapulae, pelvis & limbs
Which bones make up the pectoral girdle?
Scapula and clavicle
NOTE: Humerus is NOT a part of the pectoral girdle!!
5 Ligaments in the shoulder region
Coracoclavicular (trapezoid and conoid) Coracoacromial Superior glenohumeral Middle glenohumeral Inferior glenohumeral
Different motions of the scapula
Elevation/depression
Protraction/retraction
Upward/Downward rotation
Muscles that attach the scapula to the humerus and move the humerus at the shoulder joint and contribute to the stabalization of this joint are called what and include what muscles? What are they innervated by?
Called scapulohumeral muscles: Deltoid, teres major, serratus anterior and the rotator cuff muscles (subscapularis, supraspinatus, infraspinatus, teres minor)
Deltoid Proximal and Distal attachments
Proximal: lateral 3rd of clavicle, acromion and spine of scapula
Distal: Deltoid tuberosity of humerus
Actions of deltoid
flexes, medially rotates, abducts, extends and laterally rotates humerus
Blood supply and innervation of deltoid
Blood supply: deltoid branch of thoracoacromial arterial trunk
Innervation: axillary nerve (C5, C6)
Teres major proximal and distal attachment
Proximal: posterior surface of inferior angle of scapula
Distal: Medial lip of intertubercular groove of humerus
Teres major actions
adducts and medially rotates humerus
Blood supply and innervation of teres major
circumflex scapular artery
Lower subscapular nerve (C5, C6)
Serratus anterior proximal and distal attachments
Proximal: external surfaces of lateral parts of ribs 1-9
Distal: anterior surface of medial border of scapula
Action of serratus anterior
protracts scapula and hods it against thoracic wall; rotates scapula
Blood supply and innervation for serratus anterior
lateral thoracic artery
Long thoracic nerve (C5, C6, C7)
“raise your arms to heaven”
Which rotator cuff muscles attach to the greater tubercle of humerus? Which ones attach to lesser tubercle?
Supraspinatus, infraspinatus, and teres minor attach to greater tubercle
Subscapularis attaches to lesser tubercle
Supraspinatus proximal and distal attachments
Proximal: supraspinous fossa of scapula
Distal: superior facet of greater tubercle of humerus
Actions of supraspinatus
Works with deltoid in abduction of humerus, acts with other rotator cuff muscles in stabilizing shoulder joint
Blood supply and innervation to supraspinatus
suprascapular nerve (C4,5,6)
What specific parts are involved in shoulder impingement syndrome?
Supraspinatus tendon (tendonitis) Can also involve subacromial (bursitis)