Upper Limb Dissected in Back (extrinsic) Flashcards
latissimus dorsi origin
vertebral spines from T7 to the sacrum, posterior third of the iliac crest, lower 3 or 4 ribs, sometimes from the inferior angle of the scapula
latissimus dorsi insertion
floor of the intertubercular groove (humerus)
latissimus dorsi action
extends the arm and rotates the arm medially
latissimus dorsi innervation
horacodorsal nerve (C7,8) from the posterior cord of the brachial plexus
latissimus dorsi artery
thoracodorsal a.
latissimus dorsi notes
the inserting tendon twists so that fibers originating highest insert lowest
levator scapulae origin
transverse processes of C1-C4 vertebrae
levator scapulae insertion
medial border of the scapula from the superior angle to the spine
levator scapulae action
elevates the scapula
levator scapulae innervation
dorsal scapular nerve (C5); the upper part of the muscle receives branches of C3 & C4
levator scapulae artery
dorsal scapular a.
levator scapulae notes
levator scapulae is named for its action
rhomboid major origin
spines of vertebrae T2-T5
rhomboid major insertion
medial border of the scapula inferior to the spine of the scapula
rhomboid major action
retracts, elevates and rotates the scapula inferiorly
rhomboid major innervation
dorsal scapular nerve (C5)
rhomboid major artery
dorsal scapular a.
rhomboid major notes
named for its shape
rhomboid minor origin
inferior end of the ligamentum nuchae, spines of vertebrae C7 and T1
rhomboid minor insertion
medial border of the scapula at the root of the spine of the scapula
rhomboid minor action
retracts, elevates and rotates the scapula inferiorly
rhomboid minor innervation
dorsal scapular nerve (C5)
rhomboid minor artery
dorsal scapular a
rhomboid minor notes
named for its shape
serratus posterior origin
Superior: ligamentum nuchae, spines of vertebrae C7 and T1-T3
Inferior: thoracolumbar fascia, spines of vertebrae T11-T12 and L1-L2
serratus posterior insertion
Superior: ribs 2-5, lateral to the angles
Inferior: ribs 9-12, lateral to the angles
serratus posterior action
Superior:elevates the upper ribs
Inferior: pulls down lower ribs
serratus posterior innervation
Superior: ranches of the ventral primary rami of spinal nerves T1-T4
Inferior: branches of the ventral primary rami of spinal nerves T9-T12
serratus posterior artery
Superior: posterior intercostal aa. 1-4
Inferior:lowest posterior intercostal a., subcostal a., first two lumbar aa.
serratus posterior notes
a respiratory muscle, it receives ventral ramus innervation; embryonically related to the intercostal muscles, not the deep back mm.
trapezius origin
medial third of the superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of vertebrae C7-T12
trapezius insertion
lateral third of the clavicle, medial side of the acromion and the upper crest of the scapular spine, tubercle of the scapular spine
trapezius action
elevates and depresses the scapula (depending on which part of the muscle contracts); rotates the scapula superiorly; retracts scapula
trapezius innervation
motor: spinal accessory (XI), proprioception: C3-C4
trapezius artery
transverse cervical a.
trapezius notes
named for its shape; trapezius is an example of a muscle that migrates during development from its level of origin (cervical) to its final position, pulling its nerve and artery along behind
