Posterior Shoulder Flashcards
serratus anterior origin
External surfaces of lateral parts of 1st-8th ribs
serratus anterior insertion
Anterior surface of medial border of scapula
serratus anterior innervation
Long Thoracic nerve (C6,C7 fibers)
serratus anterior action
Protracts scapula and holds it against thoracic wall; rotates scapula
supraspinatus origin
supraspinatus fossa
supraspinatus insertion
Greater tubercle of humerus
supraspinatus innervation
Suprascapular nerve (C5,C6)
supraspinatus action
Assists deltoid in abducting the arm; Acts with rotator cuff muscles
infraspinatus origin
Infraspinatus fossa of scapula
infraspinatus insertion
Middle facet of greater tubercle of humerus
infraspinatus innervation
Suprascapular nerve (C5,C6)
infraspinatus action
Laterally rotates arm; acts with rotator cuff muscles
teres minor origin
Middle part of lateral border of scapula
teres minor insertion
Inferior facet of greater tubercle of humerus
teres minor innervation
Axillary nerve (C5, C6)
teres minor action
Laterally rotates arms; and acts with rotator cuff muscles
teres major origin
Posterior surface of inferior angle of scapula
teres major insertion
Medial lip of intertubercular sulcus of humerus
teres major innervation
Lower subscapular nerve (C5,C6)
teres major action
Adducts and medially rotates arm
subscapularis origin
Subscapular fossa
subscapularis insertion
Lesser tubercle of humerus
subscapularis innervation
Upper and Lower subscapular nerves (C5,C6,C7)
subscapularis action
Medially rotates arm; holds head of humerus in glenoid cavity
lattisimus dorsi origin
Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, inferior 3 or 4 ribs
lattisimus dorsi insertion
Floor of intertubercular sulcus of humerus
lattisimus dorsi innervation
Thoracodorsal nerve (C6.C7.C8)
lattisimus dorsi action
Extends, adducts, and medially rotates humerus; raises body towards arms during climbing
rhomboid major origin
Spinous processes of T2-T5
rhomboid major insertion
Medial border of scapula from level of spine to inferior angle
rhomboid major innervation
Dorsal scapular nerve (C4,C5)
rhomboid major action
Retracts scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall
rhomboid minor origin
Nuchal ligament; spinous processes of C7 and T1
rhomboid minor insertion
Smooth triangular area at medial end of scapular spine
rhomboid minor innervation
Dorsal scapular nerve (C4,C5)
rhomboid minor action
Retract scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall
levator scapulae origin
Posterior tubercles of transverse processes of C1-C4
levator scapulae insertion
Medial Border of scapula superior to root of scapular spine
levator scapulae innervation
Dorsal Scapular nerve (C5) and Cervical nerves C3 and C4
levator scapulae action
Elevates scapula and tilts glenoid cavity inferiorly by rotating scapula
trapezius origin
Medial third of superior nuchal line; nuchal ligament; spinous processes C7-T12
trapezius insertion
Lateral third of clavicle; acromion and spine of scapula
trapezius innervation
Spinal Accessory nerve (XI) motor and C3,C4 spinal nerves pain and proprioception
trapezius action
Descending part elevates; ascending part depresses; middle (or all) retracts scapula’ descending and ascending parts act together to rotate glenoid cavity superiorly
omohyoid origin
Superior bordee of the Scapula
omohyoid insertion
Hyoid Bone
omohyoid innervation
Ansa cervicalis from cervical plexus (C1-C3)
omohyoid action
Fixes or depresses hyoid bone
deltoid middle head origin
Acromion
deltoid posterior head origin
Scapular spine
deltoid anterior head origin
Lateral third of clavicle
Deltoid insertion
Deltoid tuberosity on lateral side of the humerus
Deltoid innervation
Axillary Nerve (C5,C6)
deltoid anterior head action
Flexion and internal rotation of humerus
deltoid middle head action
Abduction of humerus
deltoid posterior head action
Extension and lateral rotation of humerus
