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84 Cards in this Set
- Front
- Back
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Trapezius Origin
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External occipital protuberance, superior nuchal line, ligamentum nuchae, spinous processes of C7-T12
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Trapezius Insertion
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Upper fibers insert on distal 1/3 of clavicle
Middle fibers insert on acromion Lower fibers insert on entire spine of scapula |
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Innervation of Trapezius
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CN XI (spinal accessory n.), joined by motor branches from C3 & C4
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Action when all 3 regions contract
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Retraction of Scapula
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Action of superior trapezius fibers
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Pull upward on lateral angle (glenoid cavity)
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Action of middle trapezius fibers
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upward rotation, preventing sagging of lateral angle of scapula
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Action of inferior trapezius fibers
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pull downward on base of spine
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Action when superior and inferior regions of trapezius contract
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Glenoid cavity rotates upward, normally accompanied by abduction of the arm
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Origin of Latissimus Dorsi
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Spinous processes of T7-S1, posterior part of iliac crest, ribs 9-12 by muscular slips
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Muscular slips on ribs 9-12 of latissimus dorsi interdigitate with...
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slips of origin for the external oblique
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Insertion of Latissimus dorsi
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crest of the lesser tubercle of the humerus
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Innervation of Latissimus Dorsi
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Thoracodorsal n (C6-C8)
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Thoracodorsal n. is a motor branch of...
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posterior cord of brachial plexus
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Actions of Latissimus Dorsi
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adduction, medial rotation, extension of arm ( all combined=swimming stroke)
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Inferior fibers prevent...
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displacement of shoulder when weight of body produces this action
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Origin of levator scapulae
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C1-C3(C4)
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Insertion of levator scapulae
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superior angle and medial border of scapula as far as the base of spine on medial edge.
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Innervation of levator scapulae
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dorsal scapular n. (C5)
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Actions of levator scapulae
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elevates medial edge of scapula
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Origin of Rhomboideus Major
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spinous processes of T2-T5
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Insertion of Rhomboideus Major
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Medial border of scapula, inferior to base of spine
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Innervation of Rhomboid Major
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dorsal scapular n.
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Action of rhomboideus major
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elevates medial border and retracts scapula
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Origin of Rhomboideus Minor
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Lower part of ligamentum nuchae, spinous processes of C7-T1
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Insertion of Rhomboideus Minor
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medial border of scapula at base of spine
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Innervation of rhomboideus minor
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dorsal scapular n. (C5)
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Actions of rhomboideus minor
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elevates medial border and retracts scapula
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Origin of Serratus Anterior
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Lateral surfaces of ribs 1-9
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insertion of serratus anterior
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medial border of scapula, anterior to rhomboideus mm.
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Innervation of serratus anterior
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long thoracic n (C5-C7)
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Action of Serratus Anterior
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Protracts (draws forward) scapula holding medial border securely to thoracic wall
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Serratus anterior aids ____ muscle when ____
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Trapezius, during contraction, inferior angle moves forward faster than remainder of the medial border, the scapula is upwardly rotated.
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Most important action of serratus anterior
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Upward rotation of scapula
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Origin of Deltoid
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lateral 1/3 of clavicle, acromion, spine of scapula (same as insertion of trapezius)
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Insertion of Deltoid
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Deltoid tuberocity on body of humerus
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Innervation of deltoid
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axillary n. (C5-C6)
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Actions of deltoid
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anterior fibers: medially rotate arm
middle fibers: abduct arm posterior fibers: laterally rotate arm |
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When only rotation of arm is desired, does deltoid participate?
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No
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Origin of supraspinatus m
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supraspinatus fossa, and fascia covering same muscle
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insertion of supraspinatus m.
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Uppermost of 3 facets of the greater tubercle of the humerus.
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Tendon of insertion of supraspinatus m. forms...
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uppermost part of the rotator cuff of shoulder
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Innervation of supraspinatus m
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suprascapular n. (C5-C6)
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Actions of supraspinatus
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Abduction of arm
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Action of supraspinatus m when arm is at rest
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supports arm against downward pull
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Origin of infraspinatus m
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Infraspinatus fossa, and fascia covering same muscle
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insertion of infraspinatus m
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middle facet on the greater tubercle of the humerus
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tendon of insertion of infraspinatus forms...
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middle part of rotator cuff
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Innervation of infraspinatus m.
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suprascapular n.
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Actions of infraspinatus m.
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lateral rotation of arm
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Origin of teres minor m.
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middle 1/2 of lateral border of scapula
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insertion of teres minor m.
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lowest facet on greater tubercle of the humerus
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Tendon of insertion of teres minor m. forms.
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lowest part of rotator cuff
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Innervation of teres minor m.
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Axillary n.
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Actions of teres minor m.
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lateral rotation of arm (primary action) also a weak adductor of arm
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Origin of Teres major m.
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lower 1/3 of lateral border of sapula
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Path and insertion of teres major m.
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passes around medial side of humerus with latissimus dorsi to attach to crest of the lesser tubercle of humerus
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Innervation of Teres major
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lower scapular n. (C5-C6)
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Actions of Teres major
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adduction, medial rotation and extension of arm
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T/F Teres major acts only when adduction, medial rotation, and extension of arm is resisted.
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T
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Origin of subscapularis
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Costal surface of scapula (subscapular fossa)
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Insertion and path of subscapularis
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passes across front of shoulder joint inserts into the lesser tubercle of humerus and its crest
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Innervation of subscapularis m.
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upper and lower subscapular nn.
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Actions of subscapularis m.
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medial rotation of arm
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Tendon of insertion of subscapularis m. forms...
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Anterior part of rotator cuff
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Boundaries of quadrangular space
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superior border: lateral border of scapula and capsule of shoulder joint
lateral border: surgical neck of humerus inferior border: teres major m. medial border: long head of triceps brachii m. |
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Quadrangular space contains...
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Axillary n. and Posterior humeral circumflex a. and v.
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Blood vessels of scapular region arise from....
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neck and axilla
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Arteries arising in the neck
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Transverse cervical a. and suprascapular a.
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Transverse cervical a. is a branch of...
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thyrocervical trunk
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Transverse cervical a. supplies
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levator scapulae, trapezius, and rhomboid mm.
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Suprascapular a. is a branch of
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thyrocervical trunk
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Suprascapular a. supplies...
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supraspinatus, infraspinatus
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Suprascapular a. anastomoses with
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deep branch of transverse cervical a. and with circumflex scapular branch of subscapular a.
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Arteries arising in axilla
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Deltoid branch of thoracoacromial trunk, lateral thoracic a., subscapular a., posterior humeral circumflex a.
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Deltoid branch of thoracoacromial trunk supplies..
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deltoid m.
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Lateral thoracic a. supplies what muscle/ muscles
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Serratus anterior m.
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Branches of subscapular a.
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thoracodorsal a. and circumflex scapular a.
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thoracodorsal a. supplies
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subscapularis, teres major,latissimus dorsi, and serratus anterior mm.
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circumflex scapular a. supplies..
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infraspinatus m.
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circumflex scapular a. anastomoses with....
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suprascapular a.
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posterior humeral circumflex a. supplies
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deltoid m.
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posterior humeral circumflex a. anastomoses with....
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anterior humeral circumflex a.
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Deep lymphatic vessels of shoulder follow...
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blood vessels
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deep lymphatic vessels of shoulder drain largely into...
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axillary lymph nodes
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