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Back Muscles

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ethan1's version from 2017-08-15 21:49

Section 1

Question Answer
Trapezius (Origin, Insertion)Origin
(1) External Occipital Protuberance
(2) Medial 1/3 of nuchal lig. (C1 - C6)
(3) C7-T12
Insertion
(1) lateral 1/3 of clavicle
(2) acromion
(3) scapular spine
Trapezius (Blood Supply Innervation) Blood Supply
(1) Transverse Cervical Artery
Innervation
(1) motor: Spinal Accessory Nerve XI
(2) sensory: Ventral rami C3+C4
-----
Think: "Trapeze artists take coffee at (TCA) 11:34"
Latissimus dorsi (Origin, Insertion)Origin
(1) T7 - T12
(2) thoracolumbar fascia
(3) iliac crest
Insertion
(1) floor of intertubercular groove above humerus
Latissimus dorsi (Blood Supply Innervation) Blood Supply
(1) thoracodorsal artery/vein
Innervation
(1) thoracodorsal nerve
Trapezius (Action)Action
(1) superior: scapular elevation
(2) middle: scapular retraction
(3) inferior: scapular depression
(4) superior scapular rotation
----
Think "ElDeR trapeze artists have severe inexplicable mental slowness (SIMS), rotardation."
Latissimis dorsi (Action)Action
(1) extends
(2) adducts arm
(3) medially rotates arm
Rhomboid major (Origin, Insertion)Origin
(1) T2 - T5
Insertion
(1) medial border of scapula (inferior to rhomboid minor)
Rhomboid major (Blood Supply, Innervation) Blood Supply
(1) dorsal scapular artery/vein
Innervation
(1) dorsal scapular nerve
Rhomboid major (Action)Action
(1) scapular retraction (w/rhomboid minor)
Rhomboid minor (Origin, Insertion)Origin
(1) nuchal lig.
(2) C7-T1
Insertion
(1) medial border of the scapula (superior to rhomboid major insertion)
-----
Think: "71 minor nukes at the scapular border"
Rhomboid minor (Blood Supply, Innervation) Blood Supply
(1) dorsal scapular artery/vein
Innervation
(1) dorsal scapular nerve
----
Think "A menorah (minor-ah) by the door-ah (dorsal scapular)
Rhomboid minor (Action)Action
(1) scapular retraction (w/rhomboid major)
Levator Scapulae (Origin, Insertion)Origin
(1) C1-C4
Insertion
(1) superior angle of the scapula
"Elevator floor 1 to 4 then scapula superior"
Levator Scapulae (Blood Supply, Innervation) Blood Supply
(1) dorsal scapular artery/vein
Innervation
(1) dorsal scapular nerve
-----
Think: "hold the elevator door"
Levator Scapulae (Action)Action
(1) scapular elevation
Serratus Posterior Superior (Origin, Insertion)Origin
(1) Ligamentum nuchae
(2) C7 - T3
Insertion
(1) ribs 2 thru 5
Serratus Posterior Superior (Blood Supply, Innervation) Blood Supply
(1) intercostal arteries/veins
Innervation
(1) intercostal nerves
Serratus Posterior Superior (Blood Supply, Innervation)Blood Supply
(1) associated intercostal areteries/veins
Innervation
(1) associated intercostal nerves
(ribs 2 thru 5)
Serratus Posterior Inferior (Origin, Insertion)Origin
(1) T11 - L2
Insertion
(1) ribs 9 thru 12 (last four)
Serratus Posterior Inferior (Blood Supply, Innervation) Blood Supply
(1) associated intercostal arteries/veins
Innervation
(1) associated intercostal nerves
----
Think: "Intercostals Innervate Inferior"
Serratus Posterior Inferior (Action)Action
draws ribs back for: (1) forced expiration (2) trunk rotation
Erector Spinae m. (Origin, Insertion)Origin
(1) broad tendon of the posterior aspect of the illiac crest
(2) sacral and inferior lumbar spinous processes
(3) posterior aspect of the sacrum
(4) supraspinous lig.
Insertion
(1) iliocostalis: angles of the lower costals, cervical transverse processes
(2) longissimus: costals (between tubercles and angles), thoracic and cervical transverse processes, mastoid process of the temporal bone
(3) spinalis: supranuchal line of occipital bone
----
Think: "I Like Spine--with increasing insertion points"
Erector Spinae (Action)Action
(1) together: vertebral extension
(2) unilaterally: lateral flexion
Erector Spinae (Blood Supply, Innervation) Blood Supply
(1) muscular branches of the aorta
Innervation
(1) dorsal rami of the respective spinal nerves in each region
memorize

Section 2