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18 Cards in this Set
- Front
- Back
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How many spiral nerves are there? |
31 pairs of spinal nerves |
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what are the three main functions of the spinal cord? |
1. conduction 2. locomotion 3. reflex |
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conduction |
bundled fibers pass info up and down (CS) |
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locomotion |
repetitive, coordinated actions of several muscle groups; control of flexors and extensors |
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reflex |
involuntary stereotyped responses to stimuli |
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spinal cord in infants |
length is whole vertebral column |
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spinal cord in adults |
length 45 cm long and 1.8cm thick aka 2/3 of spine |
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where does the first pair of spinal nerves pass? |
between skull and C1 and the rest through intervertebral foramina |
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what are the divisions of the spinal cord? |
cervical, thoracic, lumbar, sacral region |
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cervical enlargement |
issues nerves of the upper limbs -located in the inferior cervical region |
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lumbar enlargement |
issues nerves of the lower limbs and pelvic region located in lumbosaccral region |
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medullary cone (conus medullaris) |
cord tapers inferior to the lumbar enlargement |
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what are the meninges? |
dura mater arachnoid mater pia mater |
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dura mater |
tough collagenous membraned surrounded by epidural space |
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arachnoid mater |
layer of simple squamous epithelium lining dura mater and contain loose mesh fibers filled with CSF (looks like web) |
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pia mater |
delicate membrane adherent to skin of brain |
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fillium terminale |
forms part of coccygeal ligament to anchor cord to coccyx |
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denticulate ligaments |
extends to dura mater to anchor the cord |
