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Scapular Muscles
Origins, insertions, innervation, action, and blood supply of Scapular muscles
55
Anatomy
Graduate
09/11/2011

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Term
Trapezius: origin
Definition
medial 1/3 of superior nuchal line; external occipital protuberance; ligamentum nuchae; spinous processes of CVII to TXII
Term
Trapezius: insertion
Definition
lateral 1/3 of posterior clavicle, medial acromion, superior edge of spine of scapula
Term
Trapezius: innervation
Definition
spinal root of accessory n. [XI] and
C3,C4
Term
Trapezius: action
Definition
elevates, retracts, depresses, rotates scapula
Term
Trapezius: blood supply
Definition
transverse cervical a.,
dorsal scapular a.
Term
Latissimus dorsi: origin
Definition
spinous processes of TVII to TXII, thoracolumbar fascia, iliac crest, lower 3-4 ribs
Term
Latissimus dorsi: insertion
Definition
floor of intertubercular sulcus of humerus
Term
Latissimus dorsi: innervation
Definition
thoracodorsal n. (C6,C7,C8)
Term
Latissimus dorsi: action
Definition
extends, adducts, medially rotates arm;
draws shoulder downward and backward
Term
Latissimus dorsi: blood supply
Definition
thoracodorsal a.
Term
Levator scapulae: origin
Definition
posterior tubercles of transverse processes CI-CIV
Term
Levator scapulae: insertion
Definition
medial border of scapula above base of spine of scapula
Term
Levator scapulae: innervation
Definition
dorsal scapular n. (C5) and C3,C4
Term
Levator scapulae: action
Definition
elevates the scapula medially, inferiorly rotates glenoid cavity
Term
Levator scapulae: blood supply
Definition
dorsal scapular a.,
transverse cervical a.
Term
Rhomboid minor: origin
Definition
ligamentum nuchae, spinous processes of CVII, TI
Term
Rhomboid minor: insertion
Definition
medial border of scapula at base of spine of scapula
Term
Rhomboid minor: innervation
Definition
dorsal scapular n. (C4,C5)
Term
Rhomboid minor: action
Definition
retracts and stabilizes scapula
Term
Rhomboid minor: blood supply
Definition
dorsal scapular a.
Term
Rhomboid major: origin
Definition
spinous processes of TII-TV
Term
Rhomboid major: insertion
Definition
medial border of scapula below base of spine of scapula
Term
Rhomboid major: innervation
Definition
dorsal scapular n. (C4,C5)
Term
Rhomboid major: action
Definition
retracts and rotates scaupla to depress the glenoid cavity
Term
Rhomboid major: blood supply
Definition
dorsal scapular a.
Term
Deltoid: origin
Definition
lateral 1/3 of anterior clavicle, lateral acromion, inferior edge of spine of scapula
Term
Deltoid: insertion
Definition
deltoid tuberosity of humerus
Term
Deltoid: innervation
Definition
anterior and posterior branches of axillary n. (C5,C6)
Term
Deltoid: action
Definition
flexes/extends, medially/laterally rotates, abducts arm
Term
Deltoid: blood supply
Definition
posterior circumflex humeral a.,
deltoid branch of thoracoacromial a.
Term
Supraspinatus: origin
Definition
supraspinous fossa of scapula
Term
Supraspinatus: insertion
Definition
superior facet of greater tubercle of humerus
Term
Supraspinatus: innervation
Definition
suprascapular n. (C4,C5,C6)
Term
Supraspinatus: action
Definition
initiates arm abduction, acts with rotator cuff muscles
Term
Supraspinatus: blood supply
Definition
suprascapular a.
Term
Infraspinatus: origin
Definition
infraspinous fossa of scapula
Term
Infraspinatus: insertion
Definition
middle facet of greater tubercle of humerus
Term
Infraspinatus: innervation
Definition
suprascapular n. (C5,C6)
Term
Infraspinatus: action
Definition
lateral rotation of arm (with teres minor)
Term
Infraspinatus: blood supply
Definition
suprascapular a.
Term
Teres minor: insertion
Definition
upper 2/3 of posterior surface of lateral border of scapula
Term
Teres minor: insertion
Definition
inferior facet of greater tubercle of humerus
Term
Teres minor: innervation
Definition
posterior branch of axillary n. (C5,C6)
Term
Teres minor: action
Definition
lateral rotation of arm, adduction
Term
Teres minor: blood supply
Definition
circumflex scapular a.
Term
Teres major: origin
Definition
posterior surface of inferior angle of scapula
Term
Teres major: insertion
Definition
medial lip of intertubercular sulcus
Term
Teres major: innervation
Definition
inferior subscapular n. (C6,C7)
Term
Teres major: action
Definition
adducts and medially rotates arm
Term
Teres major: blood supply
Definition
circumflex scapular a.
Term
Subscapularis: origin
Definition
subscapular fossa
Term
Subscapularis: insertion
Definition
lesser tubercle of humerus
Term
Subscapularis: innervation
Definition
superior and inferior subscapular nn. (C5,C6,C7)
Term
Subscapularis: action
Definition
medially rotates arm and adducts it
Term
Subscapularis: blood supply
Definition
subscapular a.,
lateral thoracic a.
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