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Muscles #1

Muscles of Shoulder and Arm

MuscleActionOriginInsertion/Innervation
Latissimus Dorsi A: Extend,adduct,med. rot. g/h joint. O: Sp. processes of last 6 thor. vert., last 3 or 4 ribs, thoracolumbar aponeurosis,& post. iliac crest. I: Crest of lesser tubercle of humerus.N: Thoracodorsal.
Teres Major A: Extend,adduct,med. rot.g/h joint. O: Lat. side of inferior angle&lower 1/2 of lat. border of scap. I: Crest of lesser tubercle of humerus.N: Lower subscapular.
Rotator Cuff:Supraspinatus A: Abduct g/h joint,stabilize head of humerus. O: Supraspinous fossa of scap. I: Greater tubercle of humerus.N: Suprascapular
Rotator Cuff:Infraspinatus A: Lat. rotate,adduct,extend,horizontally abduct g/h joint. Stabilize head of humerus. O: Infraspinous fossa of scap. I: Greater tubercle of humerus.N: Suprascapular.
Rotator Cuff:Teres Minor A: Lat. rot.,adduct,extend,horizontally abduct g/h joint. Stabilize head of humerus. O: Sup. 1/2 of lat. border of scap. I: Greater tubercle of humerus.N: Axillary.
Rotator Cuff: Subscapularis A: Med. rot. g/h joint. Stabilize head of humerus. O: Subscapular fossa of scap. I: Lesser tubercle of humerus.N: Upper&lower subscapular.
Rhomboid Major A: Adduct,elevate,downwardly rot. scap. O: Sp. processes T2-T5. I: Med. border of scap. between spine of scap.& inf. angle of scap.N: Dorsal scap. from brachial plexus.
Rhomboid Minor A: Adduct,elevate,downwardly rot. scap. O: Sp. processes C7&T1. I: Upper portion of med. border of scap.,across from spine of scap.
Levator Scapula A: Elevate,downwardly rot. scap. Lat. flex,rot. head&neck. Bilaterally ext. head&neck. O: Trans. processes of C1-C4. I: Upper med. border&sup. angle of scap.N: Dorsal scapular&cervical nerves.
Serratus Anterior A: W/ O fixed: Abduct,depress scap. Hold med. border of scap against ribs. If scap. is fixed: acts in forced inhalation. O: Surfaces of upper 8 or 9 ribs. I: Ant. surface of med. border of scap.N: Long thoracic.
Pectoralis Major A: All fibers: Adduct,med.rot. g/h joint. Assist in forced inhalation.Upper fibers: Flex,horizontally adduct g/h joint.Lower fibers: Extend g/h joint. O: Med. 1/2 of clavicle,sternum,& cartilage of ribs 1-6. I: Crest of greater tubercle of humerus.N: Medial & lateral pectoral.
Pectoralis Minor A: Depress,abduct,tilt scap. ant.If fixed: assist inhalation. O: Ribs 3,4,& 5. I: Coracoid process of scap.N: Medial pectoral.
Serratus Anterior A: W/ O fixed: Abduct,depress scap. Hold med. border of scap against ribs. If scap. is fixed: acts in forced inhalation. O: Surfaces of upper 8 or 9 ribs. I: Ant. surface of med. border of scap.N: Long thoracic.
Pectoralis Major A: All fibers: Adduct,med.rot. g/h joint. Assist in forced inhalation.Upper fibers: Flex,horizontally adduct g/h joint.Lower fibers: Extend g/h joint. O: Med. 1/2 of clavicle,sternum,& cartilage of ribs 1-6. I: Crest of greater tubercle of humerus.N: Medial & lateral pectoral.
Pectoralis Minor A: Depress,abduct,tilt scap. ant.If fixed: assist inhalation. O: Ribs 3,4,& 5. I: Coracoid process of scap.N: Medial pectoral.
Subclavius A: Draw clavicle inf.&ant. Elevate 1st rib,stabilize sternoclavicular joint. O: 1st rib & cartilage. I: Inf.,lat. border aspect of clavicle.N: Subclavian.
Biceps Brachii A: Flex elbow,supinate forearm,flex g/h joint. O: Short head: Coracoid processLong head: Supraglenoid tubercle. I: Tuberosity of radius & aponeurosis of biceps brachii.N: Musculocutaneous.
Triceps Brachii A: All heads: Ext. elbow.Long Head: Extend,adduct g/h joint. O: Long Head: Infraglenoid tubercle.Lat. Head: Post. surface of proximal 1/2 of humerus.Med. Head: Post. surface of distal 1/2 of humerus. I: Olecranon process of ulna.N: Radial.
Coracobrachialis A: Flex,adduct g/h joint. O: Coracoid process. I: Med. surface of mid-humeral shaft.N: Musculocutaneous.
Sternocleidomastoid A: Unilat.:Lat.flex head&neck to same side,rotate head&neck to opp. side.Bilat.:Flex neck,assist in inhalation. O: Sternal head: Top of Manubrium.Clavicular head:Med. 1/3 of clavicle. I: Mastoid process of temporal bone&lat. portion of sup. nuchal line of occiput.N: Spinal Accessory.
Anterior Scalene A: Unilat.:W/ribs fixed,lat.flex head&neck to same side. Rotate head&neck to opp. side.Bilat.: Elevate ribs during inhalation,flex head&neck. O: Transverse process of C3-C6. I: First rib.N: Cervical & brachial plexuses.
Middle Scalene A: Unilat.:W/ribs fixed,lat.flex head&neck to same side. Rotate head&neck to opp. side.Bilat.: Elevate ribs during inhalation. O: Transverse process of C2-C7. I: First rib.
Posterior Scalene A: Unilat.:W/ribs fixed,lat.flex head&neck to same side. Rotate head&neck to opp. side.Bilat.: Elevate ribs during inhalation. O: Transerve process of C5&C6. I: 2nd Rib.N: Brachial plexus.
Splenius Capitis A: Unilat.: Rotate head&neck to same side,lat. flex head&neck.Bilat.: Extend head&neck. O: Ligamentum nuchae,spinous process of C7-T3. I: Mastoid process&lat.portion of Sup. nuchal line.N: Branches of dorsal division of cervical.
Splenius Cervicis A: A: Unilat.: Rotate head&neck to same side,lat. flex head&neck.Bilat.: Extend head&neck. O: Spinous process of T3-T6. I: Transverse process of upper cervical vertebrae.N: Branches of dorsal division of cervical.
Deltoid A: All fibers: Abduct g/h joint. Ant. fibers: Flex, medially rotate,horizontally abduct g/h joint. Post. fibers: Extend,laterally rotate,horizontally abduct g/h joint. O: Lateral 1/3 of clavicle, acromion, & spine of scap. I: Deltoid tuberosity.N: Axillary from brachial plexus.
Trapezius A: Upper fibers: Bilaterally, ext. head&neck. Unilaterally, lat. flex head&neck 2 same side, rot. head& neck to opp. side, elevate,upwardly rot. scap.Middle fibers: Adduct,stabilize scap.Lower fibers: Depress,upwardly rot. scap. O: External occipital protuberance, medial sup.nuchal line of occiput, ligamentum nuchae,& sp. processes of C7-T12. I: Lat. 1/3 of clavicle, acromion,& spine of scap.N: Spinal accessory&cervical plexus.
Created by: krystalkm
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