Anatomy Ch. 17, Spinal Cord and Nerves

hrdcorhrvivor's version from 2017-04-20 03:59

Section 1

Question Answer
protective structuresvertebral column and meninges
meningesdura mater: superficial. arachnoid mater: middle, collagen and elastic fibers, avascular. pia mater: inner, vascular
in between each meningeal layer are spacesepidural space, subdural space, subarachnoid space
enlargements of spinal cordcervical, lumbar
conus medullarisinferior, tapered end between T12-L1
filum terminalepia mater extension that attaches the spinal cord to cocyx
cauda equinaroots of inferior nerves
gray mattercell bodies
white bodiesaxons
gray hornsant, post, lat
white columnsant. post. lat
anterior median fissure and post median sulcusmark midline of spinal cord
central canal filled withCSF
spinal nerves31 pairs, cervical C1-C8, thoracic T1-T12, lumbar L1-L5, sacral S1-S5
mixed nervecombination of motor and sensory axons
connective tissue in spinal nervesepineurium: surrounds whole nerve, fuses with dura mater as nerve enters spinal canal. perineurium: around fascicle. endonuerium: around single axon
dorsal post rootsensory neurons
ventral ant rootmotor neurons
dorsal root ganglioncell bodies of sensory neurons
what is a spinal nervefusion of roots and ganglionic processes
tracts v nervestracts: bundles of axons (white matter) extending up or down spinal cord sensory(to brain) motor(from brain). nerves: bundles of axons in PNS

Section 2

Question Answer
meningeal branchreenters spinal canal and innervates strux w/in spinal canal (BV, meninges)
anterior ventral ramusmuscles of skin of lateral and ventral trunk
posterior dorsal ramusdeep muscles and skin of dorsal portion of trunk
plexusesnetwork of axons, axons from ant rami all form plesuses except T1-T12, cervical, brachial, lumbar, sacral
cervical plexusformed by ant rami of C1-C5, phrenic nerve supplies diaphragm
brachial plexusformed by ant rami of C5-C8, T1. supplies shoulders and upper limbs, rami come together to form trunks, cords, then nerves
trunks of brachial plexussup: rami of C5 and C6. middle: rami of C7. inf: rami of C9 and T1
5 nerves of brachial plexusaxillary: deltoid and teres minor. musculocutaneous: ant muscles of arm. radial: post arm and forearm. median: ant muscles of forearm, some hand. ulnar: anteromedial muscles of forearm, most hand, pinkie
lumbar plexusant rami of L1-L4, supplies anterolateral abdominal wall, ext. genitals, lower part of limbs.
lumbar plexus nervesfemoral: thigh extensors and flexors. obturator: leg adductors, skin over medial thigh. lat cutaneous: skin over lat, ant, post thigh
sacral plexusant rami L4-L5, S1-S4, supplies buttocks, perineum, lower limbs. sciatic nerve: tibial and common fibular nerve. pudendal nerve: inf anal nerves
dermatomesarea of skin that provides sensory input to CNS via one pair spinal nerves or trigeminal nerve, used diagnostically and therapeutically
white matter functioncontains sensory and motor tracts used to conduct sensory impulses to brain, motor from brain
gray matter functionsite of integration
direct pathwayconvey nerve impulses that originate in cerebral cortex and produce voluntary skel musc movements
indirect pathwayconvey nerve impulses that originate in brain stem, governs autonomic movements, musc tone, equilibrium in response to head movements