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Anatomy 1-2 Nervous System I
Anatomy lecture 8.29
50
Anatomy
Professional
09/03/2011

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Term
Which system regulates, coordinates, and integrates muscular activity and function of all organs and all organ systems by responding to both internal and external stimuli?
Definition
Nervous System
Term
What are the two main components of the Central Nervous System (CNS)?
Definition
1. Brain
2. Spinal Cord
Term
What are the 3 main components of the Peripheral Nervous System (PNS)?
Definition
1. Cranial Nerves
2. Spinal Nerves
3. Ganglia
Term
What is a nerve?
Definition
A nerve is a collection of processes of individual cells called neurons, the structural and functional units that make up the nervous system.
Term
Neurons are bundled together in groups, called a _____, when located within a peripheral nerve.
Definition
fascicle
Term
What is a fascicle?
Definition
A bundle of axons located within a peripheral nerve.
Term
What is the name of blood vessels that supply nerves?
Definition
vasa nervorum
Term
What is the name of the protective covering of a fascicle?
Definition
perineurium
Term
What is the name of the protective covering of nerves in the PNS?
Definition
epineurium
Term
Which cells form the myelin sheath?
Definition
Schwann cells
Term
Which type of neuron can have a cell body in the brain, spinal cord, or ganglion?
Definition
motor (efferent) neurons
Term
Which type of neuron contains axons and dendrites?
Definition
motor (efferent) neurons
Term
Which type of neuron can have a cell body located in the brain or ganglion, but not the spinal cord?
Definition
sensory (afferent) neurons
Term
Which type of neuron has a single process to detect and transmit information to the CNS?
Definition
sensory (afferent) neurons
Term
The _____ of a sensory neuron, unlike motor neurons, is perpendicular to the length of the neuron and is uninvolved in the information sending process.
Definition
cell body
Term
Can a single peripheral nerve contain more than one type (motor or sensory) of neuron?
Definition
Yes
Term
What are large collections of cell bodies called?
Definition
Ganglia
Term
What are the two types of neurons in the peripheral nervous system and what are their function?
Definition
1. Motor (efferent): conduct information away from cell bodies to produce an effect on a muscle.
2. Sensory (afferent): conduct information towards CNS
Term
What is the purpose of somatic nerves?
Definition
Somatic nerves travel to skeletal muscle, skin, and serous membranes and control voluntary movements. Their sensory components respond to external stimuli and are called exteroreceptors.
Term
Which type of nerve would contain exteroreceptors?
Definition
Somatic nerves
Term
What is the purpose of visceral nerves?
Definition
They are distributed to organs; control involuntary movements of smooth muscle, cardiac muscle, and secretion from glands. Sensory components relay info from internal tissues/organs and are called interoreceptors.
Term
What type of nerve would contain interoreceptors?
Definition
Visceral nerves
Term
What is the space within the spinal column in which the spinal cord is housed called?
Definition
vertebral foramen (or vertebral canal)
Term
What is the spinous process?
Definition
A outcropping on the posterior (distal) side of a vertebrae
Term
The ___ root of the spinal nerve contains sensory neurons.
Definition
dorsal
Term
The ___ root of the spinal nerve contains motor (efferent) neurons.
Definition
ventral (anterior)
Term
Which type of neurons would you expect to find in the dorsal root of the spinal nerve?
Definition
sensory (afferent)
Term
Which type of neurons would you expect to find in the ventral root of the spinal nerve?
Definition
motor (efferent)
Term
What type of neurons would you expect to find in the ventral or dorsal rami of the spinal nerve?
Definition
dorsal: both sensory and motor
ventral: both sensory and motor
Term
How many pairs of spinal nerves are there in total?
Definition
31
Term
How many spinal nerve pairs are located in the cervical region of the spinal column?
Definition
8
Term
How many pairs of spinal nerves are located in the thoracic region of the spinal column?
Definition
12
Term
How many pairs of spinal nerves are located in the lumbar region of the spinal column?
Definition
5
Term
How many pairs of spinal nerves are located in the sacral region of the spinal column?
Definition
5
Term
How many pairs of spinal nerves are located in the coccygeal region of the spinal column?
Definition
1
Term
Which is larger, the dorsal ramus or the ventral ramus of the spinal nerve?
Definition
ventral ramus
Term
What is the name of the ganglion where all the cell bodies of the sensory neurons of the spinal nerve are located?
Definition
dorsal root ganglion
Term
What is the name of the ventral rami located within the thoracic region?
Definition
intercostal nerves
Term
Where are the intercostal nerves located?
Definition
Intercostal nerves run along the ventral side of the body parallel to one another and next to the ribs
Term
What are the large networks formed by the ventral rami located in the cervical, lumbar, and sacral regions called?
Definition
plexi (eg. brachial plexus)
Term
What muscles and tissue do the ventral rami supply?
Definition
1. The 3 layers of intercostal muscles.
2. Cutaneous branches of the intercostal nerves supply the skin for sensory input (pain, touch, temperature, and pressure). These nerves end in cutaneous termini. These sensory input nerves are also called exteroreceptors.
Term
What are the geographically defined areas of skin supplied by the dorsal and ventral rami of the spinal nerves known as?
Definition
dermatome
Term
The spinal nerves of C2-C5 supply a dermatome of which area?
Definition
neck, shoulders, arms (except inner arm)
Term
Which spinal nerves supply the neck, shoulders and arms (except inner arm)
Definition
C2-C5
Term
The spinal nerves of T1-T12 supply a dermatome of which area?
Definition
Chest, abdomen, and upper back
Term
Which spinal nerves supply the chest, abdomen, and upper back?
Definition
T1-T12
Term
The spinal nerves of L1-L5 supply a dermatome of which area?
Definition
hips and front of legs
Term
Which spinal nerves supply the dermatome containing the front of the legs and hips?
Definition
L1-L5
Term
The S1-S5 spinal nerves supply a dermatome containing which body parts?
Definition
genitals, butt, back legs
Term
Which spinal nerves supply the dermatome containing the genitals, butt, and back legs?
Definition
S1-S5
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