Shoulder Flashcards
What does the pectoral girdle consist of?
the clavicle and scapula, and the cervicoaxillary canal (conduit)
Movement of the clavicle (degrees)
incline 40˚, depress 10˚, rotate on long axis, protract 30˚, retract 25˚
Movement of scapula (degrees)
elevation 40˚, depression 10˚, retract 20˚, protract 30˚, rotate up 20˚, rotate down 60˚, 1/3 of arm abduction
Coracoclavicular ligament consists of what two ligaments?
conoid ligament (medial) and trapezoid ligament (lateral)
Subscapularis
Attachment- subscapular fossa to lesser tubercle, tendon separated by subscapular bursa
Innervation- upper and lower subscapular nerves
Blood- subscapular artery
Subscapularis action
medial rotation, joint stabilization
Serratus anterior
Attachment- ribs 1-8 to medial border of scapula
Innervation- long thoracic nerve
Blood- lateral thoracic artery
Serattus anterior action
primary protractor
Subclavius
Attachment- 1st rib to costoclavicular ligament
Innervation- nerve to subclavius
Blood- clavicular branch of thoracoacromial artery
Subclavius action
depresses clavicle, stability
Pectoralis minor
Attachment- ribs 3-5 to costoclavicular ligament
Innervation- medial pectoral nerve
Blood- pectoral branch of thoracoacromial artery
Pectoralis minor action
depress, protract, downward rotation of scapula
Pectoralis major attachments
clavicular head- proximal clavicle
sternal head- lateral margin of first 7 ribs
abdominal head inserts on intertubercular groove
Pectoralis major innervation and blood supply
Innervation- medial and lateral pectoral nerves
Blood- pectoral branch of thoracoacromial artery
Pectoralis major action
medial rotation, protraction, elevation, adduction of humerus, delineates infraclavicular fossa
Teres major
Attachment- posterior inferior angle of scapula to medial lip of intertubercular groove, tendon posterior to latissimus dorsi with bursa between
Innervation- lower subscapular nerve
Blood- circumflex scapular artery
Teres major action
extends, adducts, medially rotates arm (SAME AS LATISSIMUS DORSI)
Supraspinatus
Attachment- supraspinous fossa to greater tubercle of humerus
Innervation- suprascapular nerve
Blood- suprascapular artery
Supraspinatus action
initiates abduction of arm (0-15˚), some medial rotation, stabilize joint
Infraspinatus
Attachment- infraspinous fossa to middle facet of greater tubercle of humerus
Innervation- suprascapular nerve
Blood- suprascapular artery
Infraspinatus action
lateral rotates humerus, stabilizes shoulder joint
Teres minor
Attachment- lateral border of scapula to inferior facet on greater tubercle of humerus
Innervation- axillary nerves
Blood- circumflex scapular artery
Teres minor action
lateral rotates humerus, stabilizes shoulder joint
Deltoid
Attachment- lateral 1/3 of clavicle and spine of scapula to deltoid tuberosity of humerus
Innervation- axillary nerve
Blood- deltoid branch of thoracoacromial artery and posterior
Deltoid action
abducts arm from 15 to 120˚, anterior part of muscle flexes and medially rotates while posterior part extends and laterally rotates
What type of joint is the sternoclavicular joint?
synovial
What are the bones involved with the sternoclavicular joint?
clavicular notch and sternal facet
Ligaments involved in the sternoclavicular joint?
anterior and posterior sternoclavicular ligaments, interclavicular ligament, and costoclavicular ligament
Movement of the sternoclavicular joint
clavicle -incline 40˚ -depress 10˚ rotate on long axis -protract 30˚ -retract 25˚
Acromioclavicular joint is what type of joint?
synovial
Ligament involved in acromioclavicular joint?
acromioclavicular ligament
What type of joint is the scapulothoracic?
muscular
What are the two bursae of the scapulothoracic joint?
subscapular bursa- between subscapularis and serratus anterior
scapulothoracic bursa-between serratus anterior and external intercostals
Muscles involved with the scapulothoracic joint?
subscapularis (superficial), serratus anterior (middle), and external intercostals (deep)
Movement of the scapulothoracic joint?
- elevation 40˚
- depression 10˚
- retract 20˚
- protract 30˚
- rotate up 20˚
- rotate down 60˚
- does 1/3 of arm abduction
