Extrinsic Back Muscles Flashcards
name the extrinsic back muscles
trapezius
latissimus dorsi
rhomboid major
rhomboid minor
levator scapulae
what is the origin of the trapezius
superior nuchal line
spinous process of cervical vertebrae
spinous process of thoracic vertebrae
what is the insertion point of the trapezius
acromion process of scapula
spine of scapula
anterior aspect of clavicle
what nerve supplies the trapezius? what information is provided by each?
Cranial Nerve XI (motor)
Cranial Nerve 3&4 (sensory)
what is the arterial supply of the trapezius?
superficial branch of transverse cervical artery
what action does the upper trapezius perform?
elevation of scapula
retraction of glenoid fossa superiorly
retraction of scapula
lateral flexion
what action does the middle division of the trapezius do?
retraction of scapula
what action does the lower division of the trapezius do?
depression of scapula
rotation of scapula
what is the origin of the latissimus dorsi?
spinous process of TV6-LV5
iliac cress
via thoracolumbar fascia
what is the insertion of the latissimus dorsi?
intertubercular groove of humerus
what is the arterial supply of the latissimus dorsi?
thoracodorsal branch of subscapular artery
what is the nerve supply of latissimus dorsi? which cranial nerves are categorized?
thoracodorsal nerve
C6,7,8
what is the action performed by the latissimus dorsi?
extension of humerus
internal rotation of humerus
adduction of humerus
what is the origin of the rhomboid major?
spinous processes of TV2 through TV5
what is the insertion of the rhomboid major?
medial border of scapula inferior to spine
what is the origin of the rhomboid minor?
spinous processes of CV7 through TV1
what is the insertion of rhomboid minor?
medial border of scapula at level of spine
what is the nerve supply to the rhomboids? what cranial nerve is that?
dorsal scapular
C5
what is the arterial supply of the rhomboids?
transverse cervical artery deep branch
what actions do the rhomboids do?
retraction of scapula
rotation of scapula to depress glenoid fossa
what is the origin of the levator scapula?
transverse process of CV1 through 4
what is the insertion of the levator scapulae?
medial border of scapula above spine
what is the nerve supply of the levator scapulae?
C3, C4, and dorsal scapular (C5)
what is the arterial supply of the levator scapulae?
transverse cervical artery deep branch
what is the action of the levator scapulae?
elevation of scapula
what about the levator scapulae and rhomboids are similar?
arterial supply - transverse cervical deep branch
insertion at medial border of scapula (levator = superior to spine, rhomboids = @ spine / inferior to spine)
