Superficial Back and Shoulders Flashcards
Latissimus dorsi nerve
Thoracodorsal (C6-C8) nerve
Latissimus dorsi origin (4)
T6-12, thoracolumbar fashia, iliac crest, lower ribs
Latissimus dorsi insertion
Intertubercular groove of humerus
Latissimus dorsi action (3)
Adducts, extends and medially rotates humerus
Trapezius nerve
Spinal accessory XI
Trapezius origin (4)
External occipital protruberance, superior nuchal line, ligamentum nuchae, spinous processes of C7-T12
Trapezius insertion (3)
Acromion, spine of scapula, lateral third of clavicle
Trapezius action (4)
Adducts and rotates scapula, upper part elevates scapula, lower part depresses scapula
Levator scapulae nerve
Nerve to levator scapulae
Levator scapulae origin
Transverse processes of C1-C4
Levator scapulae insertion
Superior medial border of scapula
Levator scapulae action (2)
Elevates scapula and tilts glenoid inferiorly
Rhomboid min/maj nerve
dorsal scapular nerve
Rhomboid minor origin
Spinous processes of C7-T1
Rhomboid min/maj insertion
Medial border of scapula
Rhomboid min/maj action
Retract (adducts) scapula
Rhomboid maj origin
Spinous processes of T2-T5
Serratus anterior nerve
Long thoracic nerve, originating at C5,6,7
Serratus anterior origin
Ribs 1-8
Serratus anterior insertion
Medial border of scapula
Serratus anterior action
Holds scapula against thorax
Deltoid nerve
Axillary nerve
Deltoid origin (3)
Lateral third of clavicle, acromion, and spine of scapula
Deltoid insertion
Deltoid tuberosity of humerus
Deltoid Action (3)
Anterior: Flexion and medial rotation of humerus. Middle: Abduction of humerus
Posterior: Extension and lateral rotation of humerus
Supraspinatus and Infraspinatus nerve
Suprascapular nerve
Supraspinatus origin
Supraspinous fossa of scapula
Supraspinatus/Infraspinatus insertion
Greater tubercle of humerus
Supraspinatus action
Initiates abduction of humerus
Infraspinatus origin
Infraspinous fossa of scapula
Infraspinatus action
Lateral rotation of humerus
Subscapularis origin
Subscapular fossa on anterior surface of scapula
Subscapularis insertion
Lesser tubercle of humerus
Subscapularis action
Medial rotation and adduction of humerus
Teres major nerve
Lower subscapular nerve
Teres major origin
Dorsal surface of inferior angle of scapula
Teres major action (2)
Adduction and medial rotation of humerus
Teres major insertion
Medial lip of intertubcular groove
Teres minor nerve
Axillary nerve
Teres minor origin
Superior portion of lateral border of scapula
Teres minor insertion
Greater tubercle of humerus
Teres minor action
Lateral rotation of humerus
3 Margins of Scapula
Medial, lateral, superior
3 Angles of Scapula
Superior, inferior, lateral (glenoid fossa)
Scapula Function
Stabilize upper extremity through muscle attachments
4 Fossas of Scapula
Supraspinatus, infraspinatus, glenoid, and subscapular
Scapular notch
Little valley on superior margin of scapula, adjacent to coracoid process
Subscapular fossa
Main area of anterior side of scapula
Head of humerus
Top area of humerus until surgical neck
Greater tubercle
Larger, lateral protrusion on head of humerus
Lesser tubercle
Smaller, medial protrusion on head of humerus
Anatomical neck of humerus
Just above tubercles of humerus
Surgical neck of humerus
Just below tubercles of humerus
Intertubercular groove
Groove between tubercles on humerus
Deltoid tuberosity
Little bump about halfway down lateral edge of humerus
6 Parts of Acromioclavicular Joint
Articular capsule, Acromioclavicular ligaments (superior and inferior), Coracoclavicular ligaments (conoid and trapezoid), articular disk
Articular capsule
Envelope surrounding a joint, including acromioclavicular joint
Conoid coracoclavicular ligament
More medial ligament attaching coracoid process and clavicle
Trapezoid coracoclavicular ligament
More lateral ligament attaching coracoid process and clavicle
Articular disk
Thin piece of fibrocartilage that separates synovial cavities in joints
4 Parts of Glenhumeral Joint
Capsular (glenohumeral) ligament, Transverse ligament of the humerus, Coracoacromial Ligament, Glenoid labrum
Glenohumeral ligaments
Run anteriorly to attach scapula and humerus
Transverse ligament of the humerus
Crosses over intertubercular groove to turn it into a canal
Tendon of long head of biceps
Inserts in intertubercular groove right under transverse ligament of the humerus to become part of the capsular ligament of the glenohumeral joint
Glenoid labrum
Cartilaginous ring extending around glenoid cavity, deepening the socket
Rotator Cuff Muscles
Supraspinatus, Infraspinatus, Teres minor, Subscapularis
Boundaries of Axillary Artery
First rib-inferior border of teres major
Suprascapular artery
Comes off thyrocervical trunk off subclavian a. and goes over transverse scapular ligament to supply blood to supraspinatus/infraspinatus
Deep branch of transverse scapular artery (dorsal scapular artery)
Comes off thyrocervical trunk just above suprascapular artery and goes over shoulder, under levator scapulae and follows medial margin of scapula to supply blood to trapezius, levator scapulae, and rhomboid major and minor
Subscapular artery
Comes off last 3rd of axillary artery, supplies subscapularis, and breaks into scapular circumflex artery and thoracodorsal artery
Scapular circumflex artery
Comes off subscapular artery, hugs lateral margin of scapula and supplies subscapularis, teres minor, and teres major
Thoracodorsal artery
Comes off subscapular artery and runs to latissimus dorsi along w/ thoracodorsal nerve
Anterior humeral circumflex artery
Comes off axillary artery (before posterior humeral circumflex artery), wraps around humerus, and supplies latissimus dorsi (?)
Posterior humeral circumflex artery
Comes off axillary artery (after anterior humeral circumflex artery), goes through quadrangular space and breaks into ascending and descending branches and it wraps around humerus, and helps feed deltoid and teres minor
Scapular Arterial Anastomosis (2)
Proximal component: suprascapular a., deep branch of transverse cervical a., and distal component: subscapular a.
Cutaneous Innervation of Shoulder/Back (3)
Supraclavicular n., axillary n., and posterior primary rami
Suprascapular nerve
Travels under superior transverse scapular ligament and innervates supraspinatus and infraspinatus
Dorsal scapular nerve
Branch of transverse cervical nerve, innervates leviator scapulae, rhomboid minor and major
Axillary nerve
Runs through quadrangular space and innervates teres minor and deltoid
Upper subscapular nerves
Innervate subscapularis
Lower subscapular nerves
Innervate subscapularis and teres major
Long thoracic nerve
From C5-7, travels down posterior wall to supply serratus anterior
Boundaries of quadrangular space
Lat: Humerus. Med: Long head of triceps brachii. Sup: Teres minor. Inf: Teres major
Contents of quadrangular space
Axillary n. and posterior humeral circumflex artery
Boundaries of triangular interval
Med: Long head of triceps brachii. Lat: Humerus. Sup: Teres major
Contents of triangular interval
Radial nerve and profunda brachii artery
Boundaries of triangular space
Lat: Long head of triceps brachii. Sup: Teres minor. Inf: Teres major
Contents of triangular space
Branch of scapular circumflex artery
Shoulder Dislocation (2)
Anterior most common, can have subluxation (partial dislocation)
Bursitis
Inflammation of bursa, can calcify
2 shoulder nerve injuries
Spinal accessory nerve - shoulder depressed and can’t shrug bc trapezius disabled, or get arm above 90 deg
Long thoracic nerve - lose serratus anterior so get winged scapula
Supraspinatus muscle injury
Can’t initiate raising of the arm