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What are the two most superficial muscles of the shoulder
trapezius and deltoid muscles
State the origin, insertion, inner cation and function of the shoulder muscles
Back (Definition)
Muscles of the posterior scapula region
Table 1.2 Muscles of the posterior scapular region (spinal segments in bold are the major segments innervating the muscle)
Muscle
Origin
Insertion
innervation
Function
Supraspinafus
Medial two-thirds of the
Most superior facet on the greater Suprascapular nerve
Rotator cuff muscle; participates
supraspinous fossa of the scapula tubercle of the humerus
(Cs. C6)
in abduction of the glenohumeral joint; stabilization of
and the deep fascia that covers
glenohumeral joint
the muscle
Infraspinatus
Medial fwo-thirds of the
Middle facet on posterior surface
Suprascapular nerve
Rotator cuff muscle, lateral
infraspinous fossa of the scapula of the greater tubercle of the (Cs. C6)
rotation of arm at the
and the deep fascia that covers humerus
glenohumeral joint,; stabiliyion
of glenohumeral joint
Teres minor
Upper two-thirds of a flattened inferior facet on the posterior
Axillary nerve
Rofafor cuff muscle; lateral
strip of bone on the posterior surface of the greater tubercle of (Cs. C6)
glenohumeral joint; stabilization
surface of the scapula immediately the humerus
adjacent to the lateral border of the scapula
Teres major
Elongate oval area on the
Medial lip of the infertubercular inferor subscapular
Medial rotation and extension of
posterior surface of the inferior sulcus on the anterior surface of nerve (CS. C6, C7) the arm at the glenohumeral joint;
stabilization of glenohumeral joint
angle of the scapula
the humerus
Long head of infraglenoid tubercle on scapula
Common tendon of insertion with Radial nerve
Extension of the forearm at the
medial and lateral heads on the
(C6. C7. CB)
elbow joint; accessory adductor
triceps brachi
olecranon process of ulna
and extensor of the arm at the glenohumeral joint
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