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Muscle Origins, Insertions, Actions, & Innervations (Shoulder)

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jutezazo's version from 2015-09-12 02:22

Summary

This page helps you memorize the origins, insertions, actions, and innervations of the shoulder muscles according to CTC PTA curriculum.

Shoulder Muscles innervated by Spinal Accessory Nerve (Cranial nerve XI)

Question Answer Column 3 Column 4 Column 5
Upper Trapeziusmiddle 1/3 of nuchial line
external occipital protuberance
spinous process c7-t12
lateral 1/3 clavicle
acromion
spine of scapula
scapular elevation
scapular depression
scapular retraction
rotates glenoid fossa superiorly
c11 Accessory nerve
memorize

Shoulder Muscles innervated by Misc nerves

Question Answer Column 3 Column 4 Column 5
Levator Scapula MuscleTransverse processes of first four cervical vertebraeVertebral border of scapula between the superior angle and spineScapular elevation and downward rotationThird and fourth cervical nerves C4, C5
memorize

Shoulder Muscles innervated by Thoraco... nerves

Question Answer Column 3 Column 4 Column 5
Serratus Anterior MuscleLateral surface of the upper eight ribsVertebral border of the scapula, anterior surfaceScapular protraction and upward rotationLong thoracic nerve C5, C6, C7
Latissimus Dorsispinous process of inferior 6 thoracic vetebraes
thoracocolumbar fascia
illiac crest
inferior 3-4 ribs
inferior angle of scapula
floor of bicipital groove of humerusShoulder extension, adduction, medial rotation, hyperextension (climbing)Thoracodorsal nerve C6 - C8
memorize

Shoulder Muscles innervated by ...scapular nerves

Question Answer Column 3 Column 4 Column 5
Rhomboids majorspinous process of t2-t5from below spine of scapula on medial border to inferior angle of scapulaScapular retraction
rotate glenoid fossa inferiorly
fix scapula to thoracic wall
Dorsal scapular C4-C5
Rhomboids minorspinous process of c7-t1medial border of scapula above spine of scapulaScapular retraction
rotate glenoid fossa inferiorly
fix scapula to thoracic wall
Dorsal scapular c4-c5
SupraspinatusSupraspinious fossa of the scapulasuperior greater tubercle of the humerusShoulder abduction
stabalizes humeral head in glenoid fossa
Suprascapular nerve c4-c6
InfraspinatusInfraspinous fossa of scapulamiddle facet of greater tubercle of humerusShoulder lateral rotation
stabalizes humeral head in glenoid fossa
Suprascapular nerve (c4-c6)
Teres Majorposterior surface of inferior angle of scapulanext to latissimus dorsi insertion on bicipital groove (medial side)Shoulder extension, adduction, medial rotationLower subscapular (c5-c6)
memorize

Shoulder Muscles innervated by Pectoral nerves

Question Answer Column 3 Column 4 Column 5
Pectoralis Minor MuscleAnterior surface, third through fifth ribsCoracoid process of the scapulaScapular depression, protraction, and downward rotationMedial pectoral nerve C8, T1
Pectoralis Major (Clavicular Portion)Medial third of clavicleLateral lip of bicipital groove of humerusShoulder flexion to approximiately 60 degreesLateral and medial pectoral nerve C5, C6
Pectoralis Major (Sternal Portion)Sternum, costal cartilage of first six ribsLateral lip of bicipital groove of humerusShoulder extension to approximately 60 degreesLateral and medial pectoral nerve C7 - T1
memorize

Shoulder Muscles innervated by Axillary Nerve

Question Answer Column 3 Column 4 Column 5
Anterior DeltoidLateral third of the clavicleDeltoid tuberosityShoulder flexion, medial rotation, horizontal adductionAxillary nerve C5, C6
Middle DeltoidAcromion processDeltoid tuberosityShoulder abductionAxillary nerve C5, C6
Posterior DeltoidSpine of scapulaDeltoid tuberosityShoulder extension, hyperextension, lateral rotation, horizontal abductionAxillary nerve C5, C6
Teres Minormiddle part of lateral border of scapulainferior facet of the greater tubercle on humeruslaterally rotates arm
stabilizes humeral head in glenoid fossa
Axillary nerve C5-C6
SubscapularisSubscapular fossa of the scapulaLesser tubercle of the humerusShoulder lateral rotation, horizontal abductionAxillary nerve C5, C6
memorize