Chapter 5 Shoulder Joint Flashcards
Pectoralis Major upper fibers O&I
origin: medial half of the anterior surface of clavicle
insertion: flat tendon 2 or 3 inches wide to lateral lip of intertubercular groove of humerus
Pectoralis Major upper fibers action
action: internal rotation, horizontal adduction, diagonal adduction, flexion, abduction
Pectoralis Major upper fibers innervation
innervation: lateral pectoral nerve (C5, C6, C7)
Pectoralis Major lower fibers O&I
origin: anterior surface of costal cartilages of first six ribs, and adjoining portion of sternum
insertion: flat tendon 2 or 3 inches wide to lateral lip of intertubercular groove of humerus
Pectoralis Major lower fibers action
action: internal rotation, horizontal adduction, diagonal adduction, extension from flexed position, adduction
Pectoralis Major lower fibers innervation
innervation: medial pectoral nerve (C8, T1)
Subscapularis O&I
origin: entire anterior surface of subscapular surface
insertion: lesser tubercle of humerus
Subscapularis action
action: internal rotation, adduction, extension
Subscapularis innervation
innervation: upper and lower subscapular nerve (C5, C6)
Coracobrachialis O&I
origin: coracoid process of scapula
insertion: middle of medial border of humeral shaft
Coracobrachialis action
action: horizontal adduction, diagonal adduction, flexion
Coracobrachialis innervation
innervation: musculotaneous nerve (C5, C6, C7)
Deltoid anterior fibers O&I
origin: anterior lateral third of clavicle
insertion: deltoid tuberosity on lateral humerus
Deltoid anterior fibers action
action: abduction, flexion, horizontal adduction, internal rotation, diagonal adduction
Deltoid anterior fibers innervation
innervation: axillary nerve (C5, C6)
Deltoid middle fibers O&I
origin: lateral aspect of acromion
insertion: deltoid tuberosity on lateral humerus
Deltoid middle fibers action
action: abduction, horizontal abduction
Deltoid middle fibers innervation
innervation: axillary nerve (C5, C6)
Deltoid posterior fibers O&I
origin: inferior edge of spine of scapula
insertion: deltoid tuberosity on lateral humerus
Deltoid posterior fibers action
action: abduction, horizontal abduction, external rotation, diagonal abduction
Deltoid posterior fibers innervation
innervation: axillary nerve (C5, C6)
Supraspinatus O&I
origin: medial two-thirds of supraspinous fossa
insertion: superiorly on greater tubercle of humerus
Supraspinatus action
abduction
Supraspinatus innervation
suprascapula nerve (C5)
Latissimus Dorsi O&I
origin: posterior crest of ilium, back of sacrum and spinous processes of lumbar and lower six thoracic vertebrae, sips from lower three ribs
insertion: medial side of intertubercular groove of humerus
Latissimus Dorsi action
extension, adduction, internal rotation, horizontal abduction
Latissimus Dorsi innervation
thoracodorsal (C6, C7, C8)
Teres Major O&I
origin: posteriorly on inferior third of lateral border of scapula and just superior to inferior angle
insertion: medial lip of intertubercular groove of humerus,
Teres Major action
extension, adduction, internal rotation
Teres Major innervation
lower subscapular nerve (C5, C6)
Infraspinatus O&I
origin: infraspinous fossa just below spine of scapula
insertion: posteriorly on greater tubercle of humerus
Infraspinatus action
external rotation, horizontal abduction, extension, diagonal abduction
Infraspinatus innervation
suprascapula nerve (C5, C6)
Teres Minor O&I
origin: posteriorly on upper and middle aspect of lateral border of scapula
insertion: posteriorly on greater tubercle
Teres Minor action
external rotation, horizontal abduction, extension, diagonal abduction
Teres Minor innervation
axillary nerve (C5, C6)
