Shoulder region and Brachium and Cubital Fossa Flashcards
Origin and insertion of deltoid
origin: lateral 1/3 anterior border of clavicle, acromion, spine of scapula
insertion: deltoid tuberosity
What is the action of deltoid
abduction after it has begun
anterior- flexes and medially rotates
middle- abduction only
posterior- extends and laterally rotates
What innervates deltoid
Axillary n
What is located directly deep to deltoid m
subdeltoid or subacromial bursa
What rotator cuff is most prone to injury
supraspinatus
origin and insertion of supraspinatus
origin: supraspinous fossa of scapula
insertion: highest facet on posterior surface greater tubercle of humerus
What is the action of supraspinatus
initiates abduction of the humerus
What innervates supraspinatus
suprascapular nerve
What initiates abduction of humerus
supraspinatus m
origin and insertion of infraspinatus
origin: infraspinous fossa of scapula
insertion: middle facet on posterior surface of greater tubercle of humerus
What is the action of infraspinatus
lateral rotation of humerus
What innervates infraspinatus
suprascapular n
What runs in the suprascapular notch
the supra scapular n
What runs over the suprascap notch
suprascap artery
where is the superior transverse scap ligament
closes top of suprascap notch
origin and insertion of teres minor
origin: middle 1/3 to upper 2/3 of lateral border of scapula
insertion: lowest facet on the posterior surface of the greater tubercle of the humerus
what is the action of teres minor
lateral rotation of the humerus
what innervates teres minor
axillary n
What tendons assist in strengthening the gelnohumeral joint
supraspinatus, infraspinatus and teres minor
origin and insertion of teres major
origin: dorsal surface of the inferior angle of scapula
insertion: crest of lesser tubercle of humerus
What is the action of teres major
extension, adduction and medial rotation of humerus
What innervates teres major
lower subscapular n
origin and insertion of subscapularis
origin: subscapular fossa
insertion: lesser tubercle of humerus
what is the action of subscapularis
medial rotation of humerus
what innervates subscapularis
upper and lower subscapular n
what are the rotator cuff m
subscapularis, supraspinatus, infraspinatus, teres minor
origin and insertion of serratus anterior
origin: outer surfaces of ribs 1-8 or9
insertion: vertebral costal surface of scapula from superior to inferior angle
What is the action of serratus anterior
protracts scapula, upwardly rotates the glenoid cavity, fixates scapula to thoracic wall
what innervates serratus anterior
long thoracic n
what function is serratus anterior an accessory m for
respiration when in supinated
What is characterized condition of injury to long thoracic n
elevation of scapula away from body along medial border and inferior angle “winged scapula”, inability to abduct the upper limb
What spaces are created by the long head of triceps
quadrangular and triangular
what are the borders of the quandrangular space in upper arm
superior- teres minor
inferior- teres major
lateral- humerus
medial- long head of triceps
What are the contents of the quandrangular space
axillary nerve
posterior humeral circumflex a