Please enable JavaScript.
Coggle requires JavaScript to display documents.
Mia Alvarez, Period:3 Nervous system - Coggle Diagram
Mia Alvarez, Period:3 Nervous system
-
-
-
-
-
Cranial nerves
-
Most are mixed nerves, containing sensory & motor nerve fibers,
but some are only sensory, and others are primarily motor
The first pair arises from the cerebrum, and the second pair from the thalamus, but most arise from the brainstem
The 12 pairs are designated by number and name; the numbers are in order, from superior to inferior.
Spinal nerves
-
Cervical enlargement- A thickened area near top of spinal cord, Provides nerves to upper limbs
Lumbar enlargement- A thickened region near the bottom of the spinal cord. Gives rise to nerves that serve the lower limbs.
Cauda equina (horse’s tail)- Structure formed where spinal cord tapers to a point inferiorly. Consists of spinal nerves in the lumbar & sacral areas.
Neurotransmitters
Neurotransmitters are the chemical messengers in a synapse, that convey an electrical impulse from a neuron to another cell.
-
Neurotransmitters include acetylcholine, amino acids,
neuropeptides
-
Some neurons produce one type of neurotransmitter, while others produce two or three
-
reflex arc
-
A sensory neuron, that carries the information from a receptor toward the CNS
-
-
Reflexes: automatic responses to changes (stimuli) inside or outside of the body, that help maintain homeostasis
The patellar (knee-jerk) reflex is an example of a simple reflex; it has only 2 neurons, sensory & motor, and lacks an interneuron