Module 7 Flashcards
Does all input reach our conscious awareness?
No, only a fraction of sensations reaches our conscious awareness
Where is white matter located on the spinal cord? Grey matter?
White matter is located on outer portion of the spinal cord. Gray matter is located on the inner portion of the spinal cord
Describe the caudal equina.
The cauda equina is long, inferiorly extending dorsal and central roots including the filum terminale. (Think: it resembles a horses tail)
A typical spinal cord has how many pairs of spinal nerves and where does the spinal cord end?
31 pairs of spinal nerves; ends @ L1 /L2
What does the Dorsal Root contain?
Axons of sensory neurons
What does the dorsal root ganglion contain?
Sensory neuron cell bodies
What does the ventral root contain?
It contains axons of motor neurons extending into periphery to control somatic ad visceral effectors
What does the spinal root contain?
the spinal root contains axons of both sensory and motor neurons. The sensory enter the CNS through the dorsal root and the motor exit the CNS through ventral root
What are the three meningeal layers surrounding the spinal cord from superficial to deep?
Dura mater, Arachnoid mater, Pia mater
Where is cerebrospinal fluid ?
CSF is located in the subarachnoid space; between the arachnoid mater and Pia mater
Ascending tracts carry sensory information….
Towards the brain
Descending tract convey motor commands towards…..
The spinal cord
What do we call group of neuronal cell bodies in the peripheral nervous system?
Ganglia
A disease that damages myelin sheaths would affect which portion of the spinal cord?
White matter/ tracts
What is divergence?
The spread of information from one neuron to many
