Lab #11: Peripheral Nervous System & Testing Spinal Reflexes Flashcards
How many pairs of spinal nerves are there?
31
What do all pairs of spinal nerves form from?
All pairs of spinal nerves form from the fusion of the anterior and posterior roots of the spinal cord
Anterior roots carry what kind of axon? Where do they carry them?
Anterior roots carry motor axons emerging from the spinal cord (away from the spinal cord)
Posterior roots carry what kind of axon? Where do they carry them?
Posterior roots carry sensory axons to the spinal cord
Each spinal nerve carries both motor and sensory axons, so all spinal nerves are ______.
mixed nerves
After the anterior and posterior roots of the spinal cord fuse to form spinal nerves, they split off into 3 branches…
The posterior ramus, the anterior ramus, and the small meningeal branch.
The posterior rami serve the….
skin, joints, and musculature of the posterior trunk
The meningeal branches re-enter the _____ _____ to innervate _____ _____.
re-enter the vertebral canal to innervate spinal structures
The larger anterior rami travels ____ to supply the muscles of the _____.
travels anteriorly, to supply the muscles of the upper and lower limbs, anterior thorax and abdomen, and part of the back.
The anterior rami of the thoracic spinal nerves travel between the ____ as ____ separate pairs of ____ nerves
between the ribs, as 11 separate pairs of intercostal nerves
What kind of rami travel between the ribs and are intercostal nerves?
Anterior rami of the thoracic spine
The anterior rami innervate the ____.
intercostal muscles, abdominal muscles, and the skin of the chest and abdomen
The anterior rami combine to form ___ large plexuses (networks) of nerves
4
What does plexuses mean?
network of nerves
What are the 4 large plexuses of the anterior rami?
a) Cervical plexuses
b) Brachial plexuses
c) Lumbar plexuses
d) Sacral plexuses.
