302 Lab A Flashcards
Which peripheral nerves does the cervical plexus arise from?
C1-C5
Which peripheral nerves does the brachial plexus arise from?
C5-T1
Which peripheral nerves does the lumbar plexus arise from?
L1-L4
Which peripheral nerves does the sacral plexus arise from?
L4-S4
The medullary cone is approximately located at ______
L2
Which nuclei reside in the anterior horn of spinal cord gray matter?
Visceral and somatic motor nuclei
Which nuclei reside in the posterior horn of spinal cord gray matter?
Visceral and somatic sensory nuclei
The ventral root carries….
Efferent motor signals
The dorsal root carries….
Afferent sensory signals
Ascending tracts are
Afferent sensory signals UP spinal cord
Descending tracts are….
Efferent motor signals DOWN spinal cord
Order of spinal nerve structure from inside out
Rootlets —> Root (Posterior + Anterior) —> Spinal Nerve
Nerve layers
Endoneurium —> Perineurium —> Epineurium
What is the rule for numbering spinal nerves?
Name for inferior vertebrae until C8 then switch to naming for superior vertebrae
Anterior ramus
Largest branch of spinal nerves, forms cervical and lumbar plexuses
Posterior ramus
Innervates muscles and skin of back
Communicating rami
Carry info to/from sympathetic chain ganglia
Meningeal branch
Innervates structure of spinal cord
Cervical plexus includes what nerves
Phrenic
Brachial plexus includes what nerves
Axillary, Median, Musculocutaneous, Ulnar, Radial
What nerves are in the lumbar plexus
Femoral nerve
What nerves are in the sacral plexus?
Sciatic nerve
Which two nerves arise from C7?
Axillary and Radial
Which two nerves arise from C5,6 and T1?
Median and Ulnar
Order of meninges from outside in
Dura mater, arachnoid mater, (subarachnoid space), pia mater
How can you tell which is the posterior horn?
Usually closer to touching external part of spinal cord
Where is the gray commisure?
Connecting two hemispheres of gray matte
