Muscles of the back / Spinal cord info Flashcards
what nerve innervates the trapezius muscle?
Spinal accessory nerve (CN XI)
what nerve innervates the latissimus dorsi?
Thoracodorsal nerve
what nerve innervates the levator scapulae
Dorsal scapular nerve - C. V (cranial nerve 5)
what nerve innervates both rhomboids?
Dorsal scapular nerve - C. V (cranial nerve 5)
what nerves innervate the splenius capitus and cervicis?
Posterior rami of spinal nerves
what nerves innervate the erector spinae muscles? (iliocostal, longissimus, spinalis)
Posterior rami of spinal nerves
what nerves innervate the transversospinalis group of muscles? (rotatores, multifidus, semispinalis)
Posterior rami of spinal nerves
what are the superficial back muscles?
trapezius, latissimus dorsi, rhomboid major and minor, levator scapulae
where does the spinal cord begin?
begins at the foramen magnus as a continuation of the medulla oblongata
how many pairs of spinal nerves? how many of each?
31 pairs; 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal
where does the spinal cord taper and what does it form?
tapers at L1/L2 and forms the conus medullaris
the spinal nerve roots form what when they exit their vertebrae?
cauda equina
what are the two enlargements of the spinal cord?
cervical: C4-T1; lumbosacral T11-S1
what is the purpose of the two enlargements of the spinal cord?
they allow for extensive motor nerves to feed the muscles of the limbs (arms and legs)
the spinal meninges are composed of:
pia mater, arachnoid mater, dura mater
