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superficial back muscles
action, innervation, origin, and insertion of muscles
32
Anatomy
Undergraduate 4
05/31/2026

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Term
where does the trapezius originate?
Definition
superior nuchal line, EOP, ligamentum nuchae, C1-T12 SPs
Term
where does the trapezius insert?
Definition
lateral 1/3 of clavicle, acromion process, spine of scapula
Term
what are the actions of the trapezius?
Definition
elevate, retract, depress scapula
Term
what is the innervation of the trapezius?
Definition
spinal accessory nerve (CN 11)
Term
what is the blood supply of the trapezius?
Definition
superficial branch of transverse cervical vessels
Term
what is the origin of latissimus dorsi?
Definition
SPs T7 to sacrum, iliac crest, lower ribs, posterior lamella of thoracolumbar fascia
Term
what is the insertion of the latissimus dorsi?
Definition
floor of intertubercular sulcus on humerus
Term
what is the action of the latissimus dorsi?
Definition
extend, adduct, and medially rotate humerus
Term
what is the innervation of the latissimus dorsi?
Definition
thoracodorsal nerve
Term
what is the blood supply of the latissimus dorsi?
Definition
thoracodorsal artery
Term
what is the origin of the levator scapulae?
Definition
C1-C4 TPs
Term
what is the insertion of the levator scapulae?
Definition
vertebral border of scapula (above spine of scapula)
Term
what is the action of the levator scapulae?
Definition
elevates scapula
Term
what is the innervation of the levator scapulae?
Definition
dorsal scapulae nerve, C3 and C4 ventral primary rami
Term
what is the blood supply of the levator scapulae?
Definition
dorsal scapular artery OR deep branch of transverse cervical artery
Term
what is the origin of rhomboid minor?
Definition
C7-T1 SPs, ligamentum nuchae
Term
what is the insertion of rhomboid minor?
Definition
vertebral border of the scapula at the root of the spine of the scapula
Term
what is the origin of rhomboid major?
Definition
T2-T5 SPs
Term
what is the insertion of rhomboid major?
Definition
vertebral border of the scapula below the spine of the scapula
Term
what are the actions of the rhomboids?
Definition
retraction of scapula and movement of shoulder girdle (clavicle and scapula), stabilizers of scapula when other muscles are active
Term
what is the innervation of the rhomboids?
Definition
dorsal scapular nerve
Term
what is the blood supply of the rhomboids?
Definition
dorsal scapular artery OR deep branch of the transverse cervical artery
Term
which muscles attach to vertebral border of scapula, share innervation, and share blood supply?
Definition
rhomboid minor and major and levator scapulae
Term
what is the origin of serratus posterior superior?
Definition
ligamentum nuchae, C7-T3 SPs
Term
what is the insertion for the serratus posterior superior?
Definition
Ribs 2-5
Term
what is the action for the serratus posterior superior?
Definition
elevates ribs (inspiration)
Term
what is the innervation of serratus posterior superior?
Definition
ventral primary rami T2-T5
Term
what is the origin of the serratus posterior inferior?
Definition
T11-L3 SPs
Term
what is the insertion of the serratus posterior inferior?
Definition
ribs 9-12
Term
what is the action of the serratus posterior inferior?
Definition
depresses ribs (expiration)
Term
what is the innervation of the serratus posterior inferior?
Definition
ventral primary rami T9-T12
Term
what is the blood supply to the serratus muscles?
Definition
intercostal artery
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