Flashcards in Shoulder Deck (50)
What are the muscles of the pectoral region, where do they originate?
pectoralis major, pectoralis minor, serratus anterior
they originate on the anterior aspect of the axial skeleton
What innervate the muscles of the pectoral region?
Where does pectoralis major insert?
onto the proximal humeral shaft
Innervation of pectoralis major
medial and lateral pectoral nn.
Actions of pectoralis major
adduction, flexion and medial rotation of GHJ
Attachments of pectoralis minor
origin: ribs 3-5
insertion: coracoid process of the scapula
Actions of pectoralis minor
protraction of and depression of the scapula
What innervates pectoralis minor?
medial pectoral n. (medial does more)
Attachments of serratus anterior
origin: lateral aspect of ribs 1-8
insertion: anterior surface of medial border of scapula
Actions of serratus anterior
protraction and upward rotation of scapula, fixes scapula on thoracic wall
Innervation of serratus anterior
long thoracic n.
What will occur if there is injury to the long thoracic nerve?
pt will have winged scapula because serratus anterior will not be able to hold the scapula against the thoracic wall
What supplies blood to the pectoral region?
Axillary artery, gives off thoracoacromial a. and lateral thoracic a.
supplies pectoral muscles and deltoid
lateral thoracic artery
supplies serratus anterior and pectoral muscles
What are the extrinsic muscles of the back?
trapezius, levator scapulae, rhomboid minor/major, latissimus dorsi
What innervates the extrinsic muscles of the back?
Actions of trapezius?
superior fibers: elevation
middle fibers: retraction
inferior fibers: depression
superior + inferior: upward rotation
innervation of trapezius?
cranial nerve XI
can be tested by asking pt to shrug shoulders against resistance
Attachments of levator scapulae
origin: cervical transverse process
insertion: superior angle of scapula
Actions of levator scapulae
elevate and downward rotation of scapula
innervation of levator scapulae
dorsal scapular n.
attachments of rhomboid minor and major
origin: nuchal ligament and thoracic spinous process
insertion: medial border of scapula
Actions of rhomboid minor and major:
retraction and downward rotation (fixes scapula on body wall)
Innervation of rhomboid minor and major
dorsal scapular n.
attachments of latissimus dorsi
origin: thoracolumbar fascia, iliac crest, ribs
insertion: anteromedial aspect of proximal humerus
actions of latissimus dorsi
extension, adduction and medial rotation of GH joint
Innervation of latissimus dorsi
What are the intrinsic muscles of the shoulder?
rotator cuff muscles: supraspinatous, infraspinatous, teres minor, subscapularis
originate on scapula, insert on humerus