Periphial Nervous System
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
Know the anatomy of a transverse section of the spinal cord and the associated functions.
Gray Matter: Horns White Matter: Roots Spinal Nerves: 31 pairs
What is the pathway of an ascending signal? Descending signal?
Asc: Sensory receptor, Sensory neuron, Ascending pathway Des: Motor cortex, Descending pathway, Motor neuron
decussation
crossing of nerve fibers from one side of the body to the other
hemidecussation
nerve fibers from one side of the body cross over to the opposite side
contralateral
the opposite side of the body or the opposite hemisphere of the brain
ipsilateral
the same side of the body
What is a plexi? What is its importance? Where are they found?
network of nerves that come from the branching of several individual nerves. The importance of plexuses lies in their ability to provide more efficient and effective innervation to a specific area of the body. Found through out body/spine
What are the four characteristic of a reflex?
Involuntary Quick Protective Needs stimulus
Know the pathway of a somatic reflex.
• Sensory receptor stimulus • Sensory neuron • Interneuron • Motor neuron • Response
What is the function of the muscle spindle?
detect changes in muscle length and velocity of stretch
What is the difference between intrafusal vs extrafusal fibers?
Extra: fibers generate the force required for muscle contraction Intra: fibers detect changes in muscle length
what is the autonomic nervous system funtion
The PNS division that regulates the body’s involuntary functions and maintains homeostasis
What is the main effector organ for the somatic motor division?
the skeletal muscle
what Nuerotransmitters do the parasympathetic and sympathetic nervous systems use
PSNS: acetylcholine SNS: norepinephrine and epinephrine
The dorsal horns of the spinal cord bring in ________information
Sensory
The ventral horn of the spinal cord puts out________information
motor
Where are the lateral horns located on the spinal cord? What are they associated with?
located in the thoracic and upper lumbar regions of the spinal cord associated with the SNS
How is a nerve packaged? What is the outermost layer that covers the entire nerve? What is the layer that covers the bundle/fascicles? What is the layer that covers a nerve fiber?
Epineurium - outermost cover the entire nerve Perineurium - covers the bundle/fascicles Endoneurium - covers each individual nerve fiber
• Know the 5 parts of a reflex in order
receptor, sensory neuron, interneuron, motor neuron, and effector
What are the different types of Muscle spindles
Nuclear bag fibers: Nuclear chain fibers:
• What are the 5 general characteristics of a somatic reflex?
Involuntary Rapid Stereotyped Polysynaptic Localized
• What is the thoracolumbar division? What part of the autonomic nervous system is this associated with?
associated with the SNS, which is responsible for activating the body’s response to flight or fight
• What are the three pre-synaptic pathways that leave the thoracolumbar division? What are their target organs?
paravertebral - target organs located in the head, neck, thorax, and abdomen prevertebral - target organs in the abdominal and pelvic cavities adrenal medulla- target organs throughout the body to promote the fight or flight response.
• Where are the adrenal glands found?
located on top of the kidneys, one on each side