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Questions and Answers
What is the thoracic region?
What is the thoracic region?
Chest area
What is the grey matter of the spinal cord?
What is the grey matter of the spinal cord?
Deep
What does the spinal cord consist of?
What does the spinal cord consist of?
Nerves that run up and down the length of the back and transmit most messages between the body and brain
What does the dorsal ramus innervate?
What does the dorsal ramus innervate?
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What is the function of the ventral root?
What is the function of the ventral root?
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Cerebrospinal fluid fills the space between the _______.
Cerebrospinal fluid fills the space between the _______.
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What is the dorsal root ganglion?
What is the dorsal root ganglion?
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Which of the following is NOT considered a region of the spinal cord?
Which of the following is NOT considered a region of the spinal cord?
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Where is the cervical region located?
Where is the cervical region located?
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What is the conus medullaris?
What is the conus medullaris?
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What is the largest nerve in the body?
What is the largest nerve in the body?
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What comprises white matter?
What comprises white matter?
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Simple spinal reflexes occur independent of the brain.
Simple spinal reflexes occur independent of the brain.
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How do sensory stimuli enter the spinal cord?
How do sensory stimuli enter the spinal cord?
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How many neurons are typically involved in a simple spinal reflex?
How many neurons are typically involved in a simple spinal reflex?
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Where are interneurons located?
Where are interneurons located?
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Where are sensory receptors found?
Where are sensory receptors found?
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What forms a spinal nerve?
What forms a spinal nerve?
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How many pairs of spinal nerves are there?
How many pairs of spinal nerves are there?
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What does a dorsal root ganglion contain?
What does a dorsal root ganglion contain?
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What does the ventral horn of the spinal cord contain?
What does the ventral horn of the spinal cord contain?
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What do dorsal rami of spinal nerves innervate?
What do dorsal rami of spinal nerves innervate?
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What is the function of the phrenic nerve?
What is the function of the phrenic nerve?
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What does the filum terminale do?
What does the filum terminale do?
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What region of the spinal cord gives rise to eight pairs of spinal nerves?
What region of the spinal cord gives rise to eight pairs of spinal nerves?
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What region of the spinal cord gives rise to twelve pairs of spinal nerves?
What region of the spinal cord gives rise to twelve pairs of spinal nerves?
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What region of the spinal cord gives rise to five pairs of spinal nerves?
What region of the spinal cord gives rise to five pairs of spinal nerves?
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What is the conus medullaris?
What is the conus medullaris?
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Which of the following branches of a spinal nerve has the somas of only sensory neurons?
Which of the following branches of a spinal nerve has the somas of only sensory neurons?
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Study Notes
Anatomy of the Spinal Cord
- Thoracic region refers to the chest area.
- The spinal cord contains grey matter, which is located deep within its structure.
- Spinal cord functions to transmit messages between the body and brain.
- Dorsal ramus innervates skeletal muscles in the neck and back.
- Ventral root is the basal branch of each spinal nerve responsible for carrying motor neurons.
Spinal Cord Components
- Cerebrospinal fluid is found between the arachnoid mater and pia mater.
- Dorsal root ganglion contains the cell bodies of sensory neurons.
- The conus medullaris is the tapered end of the spinal cord.
Spinal Nerve Plexuses
- Anterior rami of spinal nerves form nerve plexuses except in the thoracic region.
- Posterior (dorsal) root comprises only sensory neuron somas.
Spinal Cord Regions
- Spinal cord is divided superior to inferior into cervical, thoracic, lumbar, sacral, and coccygeal regions.
- The cervical region gives rise to eight pairs of spinal nerves.
- The thoracic region produces twelve pairs of spinal nerves.
- The lumbar region generates five pairs of spinal nerves.
Neural Structures and Functions
- Filum terminale, an extension of pia mater, anchors the spinal cord to the coccyx.
- Phrenic nerve is responsible for innervating the diaphragm.
- Sciatic nerve is the largest nerve in the body.
- A secondary characteristic involves dorsal horns containing sensory neuron cell bodies and ventral horns containing motor neuron cell bodies.
Spinal Reflexes and Sensory Input
- Simple spinal reflexes can occur independently of the brain.
- Afferent axons carry sensory stimuli into the spinal cord.
- Typically, a simple spinal reflex involves three neurons: sensory, interneuron, and motor neurons.
Peripheral Nervous System (PNS)
- PNS has two divisions: somatic and autonomic.
- Somatic system involves skeletal muscle activation for body movement.
- Autonomic system controls involuntary actions such as activation of glands and smooth muscles.
Additional Facts
- 31 pairs of spinal nerves form by the union of a dorsal and ventral root.
- Dorsal rami innervate skin and muscles of the back.
- Interneurons located in the spinal cord play critical roles in reflex pathways.
- Sensory receptors are distributed throughout the body enabling stimulus detection.
Studying That Suits You
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Description
Test your knowledge on key terms from Anatomy and Physiology Lab 1, focusing on the thoracic region and spinal cord anatomy. This quiz will help reinforce your understanding of the nervous system and its components. Perfect for students wanting to enhance their learning through flashcards.
