Term
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Definition
Origin:Apex of Coracoid process
Insertion: Medial aspect of the humerus
Actions: flexion of the shoulder and adduction of the shoulder
Nerve innervation: musculocutaneous nerve
Blood Supply:brachial artery and radial recurrent |
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Term
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Definition
Origin: Anterior part is lateral end of clavicle, middle part is lateral edge of the acromion, posterior part is the posterior border of spine of scapula
Insertion: Deltoid tuberosity of humerus
Action: Abduction, Flexion, Extension
Nerve Innervation: axillary nerve
Blood Supply:Posterior humeral circumflex artery, deltoid branch of thoracoacromial artery |
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Term
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Definition
Origin: infraspinatus fossa
Insertion: Middle facet of greater tubercle of the humerus, part of the capsule of the glenohumeral jt
Action: rotates arm and stabilizes shoulder
Nerve innervation: suprascapular nerve
Blood Supply:Suprascapular artery, scapular circumflex artery |
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Term
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Definition
Origin: posterior layer of the thoracolumbar fossa, spinous processes, and supraspinatus ligaments of the lower half of thoracic vertebrae, and all lumbar vertebrae, median sacral crest, posterior crest of ilium, lower 4 ribs, small area near inferior angle of scapula, and muscular interdigitations from the obliquus external abdominus
Insertion: Floor of the intertebercular groove of the humerus
Action: Flexion, Extension, Rotation, Adduction, Retraction
Nerve Innervation: Thoracodorsal (middle subscapular) nerve
Blood Supply:Thoracodorsal artery |
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Term
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Definition
Origin: transverse processes of c1 and c2, and posterior tubercles of transverse processes of c3, c4
Insertion: Medial border os scapula between superior angle and root of spine
Action: elevation and rotation
Nerve innervation: ventral rami of spinal nerve c3 to c4 and dorsal scapular nerve
Blood Supply: Dorsal scapular artery |
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Term
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Definition
Origin: Clavicular head, sternocostal head
Insertion: Crest of great tubercle of the humerus
Action: adduction, medial rotation
Nerve Innervaton: lateral and medial pectoral nerves
Blood Supply:Pectoralis branch of thoracoacromial artery, lateral thoracic artery |
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Term
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Definition
Origin: external surfaces of the third through fifth rib
Insertion: medial border of the coracoid process
Action: all movements of the scapula
Nerve innervation: medial pectoral nerve
Blood Supply: Lateral thoracic artery |
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Term
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Definition
Origin: ligamentous nuchae and spinous processes of c7 to t5
Insertion: medial border of scapula from root of the spine to inferior angle
Action: help retract scapula
Nerve innervation: dorsal scapular nerve
Blood supply: Dorsal scapular artery |
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Term
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Definition
Origin: external surface of the lateral region of the first 9 ribs
Insertion: entire medial border of the scapula with a concentration with the fibers near the inferior angle
Action: protraction of scapula
Nerve innervation: the long thoracic nerve
Blood supply: Lateral thoracic artery, thoracodorsal artery |
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Term
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Definition
Origin: the extreme anterior end of the first rib
Insertion: inferior surface third of the clavicle
Action:Stabilizing clavicle
Nerve innervation: subclavian nerve
Blood Supply:Clavicular branch of thoracoacromial artery |
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Term
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Definition
Origin: subscapular fossa
Isertion: lesser tubercle of the humerus and part of the capsule of the glenohumeral joint
Action:Medial rotation of humerus
Nerve innervation: upper and lower subscapular nerves
Blood Supply: Branches of subscapular artery |
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Term
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Definition
Origin: supraspinatus fossa
Insertion: upper facet of greater tubercle of the humerus and part of the capsule fo the glenohumeral joint
Action: abduction of arm, stabilizes shoulder joint
Nerve innervation: suprascapular nerve
Blood Supply:Suprascapular artery |
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Term
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Definition
Origin: inferior angle of the scapula
Insertion: crest of the lesser tubercle of the humerus
Action: abduction and rotation of arm, stabilizes shoulder
Nerve innervation: lower subscapular nerve
Blood Supply:Thoracodorsal artery |
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Term
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Definition
Origin: posterior surface of the lateral border of the scapula
Insertion: lower fact of the great tubercle of the humerus and part of the capsule of the glenohumeral joint
Action: abduction and rotation of the arm, stablizes shoulder
Nerve innervation: axillary nerve
Blood Supply:Scapular circumflex artery |
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Term
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Definition
Origin: medial part of superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes and supraspinous ligaments of the 7th cervial vertebrae and all thoracic vertebrae
Insertion: upper part posterior superior edge of the lateral third of the clavicle, middle part medial margin of the acromion and upper lip of the spine of the scapula, lower part medial end of the spine of the scapula just lateral to the root
Action: rotates, elevates, and retracts scapula
Nerve innervation: primarily by the spinal accessory nerve (cranial nerve 11) secondary innervation directly from the ventral rami of c2-c4
Blood Supply:Superficial branch of transverse cervical artery (deep surface of muscle) |
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