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Spinal Cord

Spinal Reflexes Rapid, automatic nerve responses triggered by specific stimuli. Controlled by spinal cord alone.
31 Number of spinal cord segments
Ventral Root Contains axons of motor neurons
Dorsal Root contains axons of sensory neurons
Roots Two branches of spinal nerves
Dorsal root ganglia contain cell bodies of sensory neurons
Spinal nerve each side of spine. Dorsal and ventral roots join to form this.
Mixed nerves carry both afferent and efferent fibers
afferent sensory fibers
efferent motor fibers
Protect spinal cord, carry blood supply functions of the spinal meninges
Spinal meninges specialized membranes that isolate spinal cord from surroundings
Dura, Arahnoid, and Pia Mater The three meningeal layers
Dura Mater Tough and fibrous, cranially fuses with periosteum of occipital bone
Epidural Space between spinal dura mater and walls of vertebral canal. Contains loose connective and adipose tissue.
Arachnoid Mater middle meningeal layer
arachnoid membrane covers arachnoid mater
subdural space between arachnoid mater and dura mater
subarachnoid space between arachnoid mater and pia mater. filled with cerebrospinal fluid
cerebrospinal fluid (CSF) carries dissolved gases, nutrients, and wastes
pia mater innermost meningeal layer. bound to underlying neural tissue
denticulate ligaments stabilize side to side movement
white matter superficial matter that contains myelinated and unmyelinated axons
gray matter surrounds central canal of spinal cord
gray matter contains neuron cell bodies, neuroglia, and unmyelinated axons
gray horns projections of gray matter
gray commissures axons that cross from one side of the cord to the other before reaching gray matter
nuclei the functional groups that the cell bodies of neurons form
sensory dorsal nuclei that connect to peripheral receptors
motor ventral nuceli that connects to peripheral effectors
three connective tissue layers of spinal nerves epineurium, perineurium, and endoneurium
Created by: elyk01