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Functional Organization of Spinal Cord
Chapter 12 Section 1
48
Nursing
Undergraduate 3
04/17/2015

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Term
12.1 Sensory in...
Definition
Motor out
Term
12.1 Reflex
Definition
Rapid, automatic response to specific stimuli
Term
12.2 Number of Spinal Cord Segments
Definition
31;
8 cervical
12 thoracic
5 lumbar
5 sacral
1 coccygeal
Term
12.2 Gray matter greatest in spinal cord segments dedicated to...
Definition
Sensory and motor control of limbs
Term
12.2 Cervical enlargement innervates...
Definition
Shoulders/upper limbs
Term
12.2 Lumbar enlargement innervates...
Definition
Pelvis/lower limbs
Term
12.2 Spinal nerves contain...
Definition
Axons of sensory AND motor neurons
Term
12.2 Ventral Root...
Definition
Front/Motor
Term
12.2 Dorsal root...
Definition
Back/Sensory
Term
12.2 Dorsal root ganglion contains...
Definition
cell bodies of sensory neurons
Term
12.3 Spinal Meninges
Definition
Specialized membrane surrounding spinal cord
Term
12.3 3 Spinal Meningeal Layers
Definition
1. Dura Mater; tough
2. Arachnoid Mater
3. Pia Mater; delicate, blood vessels found here
Term
12.3 2 Between Meningeal Layers
Definition
1. Subarachnoid Space; CSF found here, acts as a shock absorber
2. Epidural Space; contains fat
Term
12.3 Denticulate Ligament
Definition
Prohibits superior/inferior spinal cord movement
Term
12.5 Cranial-Sacral...
Definition
Parasympathetic
Term
12.5 Thoracic-Lumbar...
Definition
Sympathetic
Term
12.5 Dermatone
Definition
Specific skin region monitored by pair of spinal nerves
Term
12.4 Structural Org. of Gray Matter
Posterior Gray Horn...
(1 of 3)
Definition
Somatic and visceral sensory nuclei
Term
12.4 Structural Org. of Gray Matter
Lateral Gray Horn...
(2 of 3)
Definition
1. thoracic & lumbar sections only
2. contains visceral motor nuclei
Term
12.4 Structural Org. of Gray Matter
Anterior Gray Horn...
(3 of 3)
Definition
Contains somatic motor nuclei
Term
12.4 Functional Org. of Gray Matter
Nuclei
(1 of 4)
Definition
functional groups of cell bodies of neurons in gray matter of spinal cord
Term
12.4 Functional Org. of Gray Matter
Sensory Nuclei
(2 of 4)
Definition
receive and relay sensory info
Term
12.4 Functional Org. of Gray Matter
Motor Nuclei
(3 of 4)
Definition
issue motor commands to peripheral effectors
Term
12.4 Functional Org. of Gray Matter
Gray Commissures
(4 of 4)
Definition
contain axons that cross from 1 side of the cord to the other
Term
12.4 Functional Org. of White Matter
Tracts (white matter)
(1 of 3)
Definition
bundles of axons in CNS (analogous to nerve in PNS)
Term
12.4 Functional Org. of White Matter
Ascending Tracts
(2 of 3)
Definition
Carry sensory info to brain
Term
12.4 Functional Organization of White Matter
Descending Tracts
(3 of 3)
Definition
Carry motor commands
Term
12.6 How a spinal nerve distributes motor commands that originate in motor nuclei of thoracic or lumbar segments of spinal cord
Definition
1. Travels along ventral root (contains axons of somatic and visceral motor neurons) of each spinal nerve
2. Ventral and dorsal root join to form spinal nerve
3. Dorsal ramus carries commands to skin and skel. muscles of back
4. Ventral ramus carries commands to ventrolateral body surf., body wall and limbs
Term
12.6 Dorsal Ramus
Definition
1. Somatic motor command--->to skel. musc. of back
2. Visceral motor command---> postganglionic fibers to smooth muscles, glands of back
Term
12.6 Ventral Ramus
Definition
1. Somatic motor command---> to skel. musc. of body wall, limbs
2. Visceral motor command---> postganglionic fibers to smooth muscl, glands of body wall and limbs
Term
12.6 Motor Commands
White Ramus Communicans
(1 of 4)
Definition
1. Carries commands to sympathetic ganglion
2. white (myelinated)
Term
12.6 Motor Commands
Gray Ramus Communicans
(2 of 4)
Definition
1. Contains postganglionic fibers that innervate glands in smooth muscle in body wall/limbs
2. unmyelinated-gray
Term
12.6 Motor Commands
Rami Communicans
(3 of 4)
Definition
White and gray rami together, communicating branches
Term
12.6 Motor Commands
Sympathetic Nerve
(4 of 4)
Definition
1. Contains preganglionic and postganglionic fibers
2. Innervates structures in thoracic cavity
Term
12.6 Sensory info is collected from...
Definition
peripheral structures and delivered to sensory nuclei in spinal cord
Term
12.6 Sensory Info.
Sympathetic nerves carries...
(1 of 4)
Definition
sense. info. from visceral orgs.
Term
12.6 Sensory Info.
Ventral Ramus carries...
(2 of 4)
Definition
sense. info. from ventrolateral body surf., body wall and limbs
Term
12.6 Sensory Info.
Dorsal Ramus carries...
(3 of 4)
Definition
Sense. info. from skin/skel. musc. of back (dorsal horn)
Term
12.6 Sensory info.
Dorsal root of each spinal nerve carries...
(4 of 4)
Definition
Sense. info to spinal cord
Term
12.7 Nerve Plexus
Definition
interwoven network of nerves
Term
12.7 Cervical Plexus
Definition
1. consists of vent. rami of spin. nerves C1-C5
2 Branches innervate:
-neck musc.
-skin of neck
-skin of sup. part of chest
-diaphragm
Term
12.7 Cervical plexus and diaphragm
Definition
1. phrenic nerve
2. formed by branches from C3-C5
3. provides all nerve supply to diaphragm
Term
12.8 Brachial Plexus
Definition
1. innervates pectoral girdle and upper limbs
2. vent. rami C4-T1
Term
12.8 Nerves originate from TRUNKS
Definition
large bundles of axons contributed by several spinal nerves
Term
12.8 Nerves originate from CORDS
Definition
smaller branches that originate at trunks
Term
12.9 Lumbar and Sacral Plexuses
Definition
innervate pelvic girdle and lower limbs
Term
12.9 Lumbar Plexus
Definition
spinal nerves T12-L4
Term
12.9 Sacral Plexus
Definition
1. spinal nerves L4-S4
2. contains sciatic nerve
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