The Spinal Cord. Protection Vertebrae Spinal meninges Three layers of connective tissue – Dura...
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Transcript of The Spinal Cord. Protection Vertebrae Spinal meninges Three layers of connective tissue – Dura...
![Page 1: The Spinal Cord. Protection Vertebrae Spinal meninges Three layers of connective tissue – Dura mater – Arachnoid mater – Pia mater Continuous with cranial.](https://reader031.fdocuments.us/reader031/viewer/2022020800/56649e0e5503460f94af8aa7/html5/thumbnails/1.jpg)
The Spinal Cord
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Protection
VertebraeSpinal meninges• Three layers of connective tissue– Dura mater– Arachnoid mater– Pia mater
• Continuous with cranial meningesCerebrospinal fluid (CSF)
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Spinal Meninges
• Epidural space: between vertebrae and dura mater
• Dura mater- tough, dense connective tissue• Arachnoid mater: resembles spider’s web– Extends into subarachnoid space
• Subarachnoid space –CSF circulates in this space
• Pia mater: thin, delicate layer –Adheres to surface of spinal cord (and
brain)–Contains blood vessels
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Spinal Meninges
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Spinal Meninges
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Structure of the Spinal Cord
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Structure of the Spinal Cord
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Spinal Nerves
Nerves attached to spinal cord by 2 roots• Dorsal root: made of axons of sensory neurons– Dorsal root ganglion: swelling containing cell
bodies of sensory neurons• Ventral root: composed of axons of motor
neurons– Both somatic motor and autonomic motor
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Spinal Cord Functions
Pathways for nerve impulses within tracts• Ascending (sensory)• Descending (motor)Reflexes: fast, involuntary sequences of actions
in response to stimuli• Can be simple (withdrawal) or complex
(learned sequence such as driving car)
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The Reflex Arc
1. Sensory receptor: responds to stimulus2. Sensory neuron: through dorsal root ganglion
and root posterior horn 3. Integrating center: single synapse between
sensory and motor neurons4. Motor neuron: from anterior horn ventral
root spinal nerve 5. Effector: muscle or gland responds
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The Reflex Arc
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