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

rename
cumomoso's version from 2017-09-27 11:42

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 TrapeziusOccipital bone, nuchal ligament on upper cervical spinous processesOuter third of clavicle, acromion processScapular elevation and upward rotationSpinal accessory (cranial nerve XI)
Middle TrapeziusSpinous processes of C7 through T3Scapular spineScapular retractionSpinal accessory (cranial nerve XI)
Lower TrapeziusSpinous processes of middle and lower thoracic vertebraeBase of the scapular spineScapular depression and upward rotationSpinal accessory (cranial nerve XI)
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
CoracobrachialisCoracoid process of the scapulaMedial surface of the humerus near the midpointStabilizes the shoulder jointMusculocutaneous nerve C6, C7
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 Dorsi Spinous processes of T7 through L5, sacrum, iliac crestMedial lip of bicipital groove of humerus Shoulder extension, adduction, medial rotation, hyperextension Thoracodorsal nerve C6 - C8
memorize

Shoulder Muscles innervated by ...scapular nerves

Question Answer Column 3 Column 4 Column 5
Rhomboid MusclesSpinous processes of C7 through T5Vertebral border of scapula between the spine and inferior angleScapular retraction and downward rotationDorsal scapular nerve C4, C5
SupraspinatusSupraspinious fossa of the scapulaGreater tubercle of the humerus Shoulder abductionSuprascapular nerve C5, C6
InfraspinatusInfraspinous fossa of scapulaGreater tubercle of humerusShoulder lateral rotation, horizontal abductionSuprascapular nerve C5, C6
Teres MajorAxillary border of scapula near the inferior angleCrest below lesser tubercle next to the Latissimus dorsi muscle attachmentShoulder extension, adduction, medial rotationSubscapular nerve C5, C6, C7
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 MinorAxillary border of scapulaGreater tubercle of humerusShoulder lateral rotation, horizontal abductionAxillary nerve C5, C6
SubscapularisSubscapular fossa of the scapulaLesser tubercle of the humerusShoulder lateral rotation, horizontal abductionAxillary nerve C5, C6
memorize