Nervous system Flashcards
Structural unit of the nervous system that reacts to stimuli and transmits impulses to one another
Neurons
Bundle of nerve fibers held together by connective tissues
Nerves
Carries nerve impulses from brain to muscles of glands
Motor neuron
Found in brain and spinal cord , communication in this region
Interneurons
What are the two types of nerve fibers found on a neuron
Dendrites, axons
which nerve fiber Connects with other neurons to receive info
Dendrites
which nerve fiber Conducts impulses away from cell body
Axon
Each anox splits into axon terminals which end with what?
Synaptic bulb
What do the synaptic bulbs store and then release
neurotransmitters
Junctions where impulses are passed from one nerve to the other
Synpases
Cns consists of what?
The brain and spinal cord
What is protected by the cranium
the brain
Front and top part of the brain. Speech, sensaiton, reasoning, will, and emotions
The cerebrum
Smaller part of brain located in the back. body balance, coordinates voluntary muscles and makes movement smooth
Cerebellum
Located in middle of brain. Hypothalamus, thalamus, pineal and pituatary gland. Controls sensory info coming into brain, regulates endocrine, horomone glands
Diencephalon
Midbrain, pons, Medulla oblongata make up what - control respiration rates and movement of heart
Brain stem
What contains all nerves that contact the cns to the body. Sppinal nerves, cranial nerves, and all branches
PNS
Autonomic nervous system consists of which two parts?
sympathetic/ parasympathetic
how many pairs of cranial nerves
12
how many pairs of spinal nerves
31
Cervical plexus controls what
Neck, shoulders, head
brachial plexus
lower neck and controls movement of arms
Lumbar plexus
abdominal organs, hip, thigh, knee, and legs
Sacral plexus
forms the sciatic nerve which is the largest and longest nerve in the body
Which sensory receptor responds to touch, pressure, vibration, and stretch?
Mechanoceptors; ruffini end organs, pacini corpuscles, and merkel discs
which sensory receptor responds to hot and cold in mouth and skin
Thermoreceptors
which sensory receptor gives us the ability to see color and form. located in eyes
Photoreceptors
which sensory receptor gives us sense of smell and taste and located in mouth and nose
Chemoreceptors
which sensory receptor detects pain
Nociceptors
nerves located throughout body and record heat pain cold and pressure
exteroceptors
nerves located in muscle spindle cells, golgi tendon organs, and joints that sense where the body is and how it moves
proprioceptors
which nervous system excites the fight or flight, increases respiration, heart rate, and cardiac output
The sympathetic nervous system
which nervous system calms down, relaxes, and regulates homeostasis. reduces heart rate, respiration, blood pressure, increases digestion found in vagus nerve and spinal nerves
the parasympathic nervous system
Routes that nerve impulses travel through which can be a reflex known as
Neural pathways / reflex arcs.
ruffini end organs, pacini corpuscles, and merkel discs are
Mechanoceptors
The part of the brain concerned with eye movement and tracking is the:
Midbrain
