Lab A Flashcards
What makes up the PNS?
Ganglia and nerves
What makes up the CNS?
Brain and Spinal Cord
What kind of information does the PNS carry and where?
Sensory information from the periphery INTO the CNS, and motor information OUT of the CNS.
What makes up the periphery?
organs, skin, muscle etc
What are the four divisions of the PNS?
visceral/somatic sensory/motor
Where does the spinal cord extend to?
L1 or L2 vertebra
True or false: the spinal cord is a continuation of the brain.
True
What are the two functions of the spinal cord?
1) Provides neural pathways between the brain and the periphery
2) Acts as an association center for relatively simple spinal reflexes
What 4 types of nerves does the spinal cord give way to?
lumbar, thoracic, sacral and cervical
What are cervical and lumbar enlargements?
thickened areas of the spinal cord.
the terminus of the spinal cord:
the medullary cone.
a collection of lumbar and sacral spinal nerves
cauda equina
A connective tissue anchor for the spinal cord
terminal filum
What three meninges enclose the spinal cord
1) dura mater (dural sheath)
2) arachnoid mater
3) pia mater
what is contained in the subarachnoid space?
cerebralspinal fluid (CSF)
What subdivides the spinal cord into hemispheres
the anterior fissure and posterior sulcus
where is gray matter found?
the interior of the spinal cord and subdivided into 3 “horns”
What connects the hemispheres of gray matter?
the gray commissure
where is white matter found?
the exterior of the spinal cord and is subdivided into “columns”.
What are the three horns of gray matter?
Posterior (dorsal), anterior (ventral), and lateral horns
Where are lateral horns primarily apparent?
the thoracic region of the spinal cord (T2-L1)
how is gray matter FUNCTIONALLY divided?
multiple nuclei
