| Question |
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| Answer |
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| Q What are the 3 "groups" of back mm.? |
A Superficial/extrinsic, intermediate, and deep/intrinsic |
| Q Which group of back mm. attach to/move the upper extremity? |
A superficial/extrinsic |
| Q which group of back mm. aid in respiration? |
A intermediate group |
| Q which group of back mm. are movers of the head/vertebrae? |
A deep/intrinsic |
| Q There are two layers of the superficial group of back mm. What mm. are contained in the first? |
A trapezius, and latisimus dorsi |
| Q There are to layers of the superficial group of back mm. In what layer are the rhomboids and levator scapulae mm.? |
A they are in the second layer of the superficial group of back mm. |
| Q What is the origin of the trapezius? |
A EOP, med 1/3 sup nuchal line, nuchal ligament, C7-T12 SP's |
| Q What is the Insertion of the trapezius? |
A ***SUP ASPECT spine of scapula, acromion process, lat 1/3 clavicle |
| Q The traps elevate, retract, and depress the scapula. What other action does the trap do? |
A rotate scapula superiorly |
| Q What is the innervation of the trap? |
A CN 11, spinal accessory, ***C3-4 |
| Q What gives blood supply to the trap? |
A superficial branch of transverse cervical artery. deep branch goes to rhomboids. |
| Q Apart from the iliac crest and sacrum, where does the latisimus dorsi originate? |
A T7-L5 SP's, thoracolumbar fascia, and ***inf 3-4 ribs |
| Q What m. is the most powerful shoulder extender with the arm in a flexed position? |
A lats. they also extend, adduct, and rotate the humerus medially |
| Q What gives blood supply to lats? |
A thoracodorsal artery. lats are innervated by thoracodorsal n. as well. |
| Q What is the origin of rhomboid major/minor? |
A C7-T1 SP's and nuchal ligament (minor), T2-T5 (major) SP's |
| Q What is the sup. end of the insertion of the rhomboid minor? |
A the spine of the scapula |
| Q What is the inf border of the insertion of the rhomboid major? |
A the inf. angle of the scapula |
| Q If the traps rotate the scap superiorly, how do the rhomboid mm. rotate the scapula? |
A the rhomboids rotate the scapula inferiorly. They also retract the scap, and fix it to the thorax. |
| Q This n. innervates the levator scap, and also the rhomboids. |
A dorsoscapular |
| Q This artery supplies the rhomboids, and levator scap. |
A deep branch of transverse cervical artery. The superficial branch goes to the traps |
| Q Does the levator scapulae m. originate from the nuchal ligament? |
A NO, the origin is the pos. tubercles of the TP's of C1-4 |
| Q What mm. rotate the scapula inferiorly? |
A levator scap (also elevates the scap, obviously) and rhomboids |
| Q The medial edge of the scapula forms the lateral border of the triangle of auscultation. What forms the other borders? (Hint, it's a triangle, so there are two other borders) |
A Lats form inf. border, and traps the medial border |
| Q Other than the pos thoracic wall, what may be found in the floor of the triangle of auscultation? |
A rhomboid major |
| Q Can you visualize the Lumbar triangle (of petit)? What are the borders? What makes the floor? |
A inf border = iliac crest, med border = lats, lat border = ex oblique, floor = int. oblique |
| Q This m. group is very thin in dissection. It also helps in respiration. What mm. are included? |
A It is the intermediate group of back mm, and includes the serratus posterior sup/inf |
| Q What is unique about the innervation of the serratus pos sup/inf mm.? |
A They are innervated by the ***VENTRAL RAMI of the intercostal nn. |
| Q Does the serratus pos sup originate from the nuchal ligament? |
A YES, also from C7-T3 SP's |
| Q This m. originates from T11-L3 SP's. |
A serratus pos. inf. |
| Q Which serratus pos. m. inserts on the sup borders of ribs? Which the inf? |
A sup to sup borders (ribs 2-5), inf to inf borders (ribs 9-12) |
| Q If the serratus posterior sup/inf mm. are innervated by the VENTRAL RAMI of intercostal nn., guess where they get blood? |
A intercostal aa. |
| Q The deep/intrinsic group has how many layers? What are they called? |
A 3 layers, sueprficial, intermediate, and deep (also minor deep layer was not talked about much) |
| Q What group/layer of the back mm. are the splenius capitis/cervicis mm. located in? |
A superficial layer of the deep/intrinsic group |
| Q The intermediate layer of the deep group of back mm. consists of erector spinae mm. These mm. are divided medially into what mm.? |
A I Lose Sleep. Iliocostalis (lat), longissimus, spinalis (med) |
| Q The deep layer of the deep group of back mm. is also called? Give me the mm. in this layer from sup to deep. |
A AKA "transversospinalis group", Some May Rest = Semispinalis (superficial), multifidus, rotatores (deep) |
| Q What weird mm. are found in this random and somewhat mysterious "minor" deep layer of the deep group of back mm.? |
A interspinalis, intertransversarii, levator costarum |
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