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7-22 spinal cord/nn
| Question | Answer |
|---|---|
| How many spinal nerves are there and how many in each section? | 31 total; 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal |
| Where does the first spinal nerve start? | Above C1 |
| Where do the rest of the nerves start? | After their corresponding vertebrea |
| What is the spinal cord an extension of? | Medulla oblongata |
| What is the spinal cord made of? | White and gray matter |
| Where does the spinal cord end? | L2 |
| What is the name where the spinal cord ends? | Conus medullaris |
| What is the name for the small nerves? | Cauda equina |
| What is the filum terminale? | Terminal portion of the spinal cord; extension of pia mater |
| What does the filum terminale anchor the spinal cord to? | Coccyx |
| What impulses do the posterior and anterior horns carry? | Posterior- sensory Anterior- motor |
| What impulses do spinal nerves carry? | Mixed |
| What are the white and gray matter comprised of? | White- axons Gray- cell bodies |
| Where do impulses carried by the white matter go? | Thalamus |
| Are anterior or posterior horns larger? | Anterior |
| What is the thick layer of the meninges? | Dura mater |
| What is between each nerve and is an extension of pia mater? | Denticulate ligaments |
| What is the subarachnoid space continuous with? | Subarachnoid space in the brain |
| What does the subarachnoid space have in it? | CSF |
| Characteristics of denticulate ligaments | Tiny, fragile, anchors spinal cord laterally |
| What layer of the meninges is adhered to the spinal cord? | Pia mater |
| What do rootlets form? | Roots |
| Are spinal ganglion motor or sensory? | Sensory |
| What is a collection of nerve cell bodies outside the CNS? | Spinal ganglion |
| What do anterior and posterior roots form? | Spinal nerve (mixed) |
| What are intercostal nerves a continuation of? | Dorsal primary rami (mixed) |
| What rami are likely to form plexuses? | Anterior |
| What type of nerves are everything distal to spinal nerves? | Mixed |
| How many posterior spinal arteries are there? | Two |
| What does the anterior spinal artery come from? | Vertebral artery |
| What arteries run with the roots and rootlets? | Segmental medullary arteries |
| What arteries don't reach the spinal arteries? | Anterior radicular arteries |
| What artery connects to anterior and posterior spinal arteries? | Anterior segmental medullary arteries |
| What do the spinal arteries supply and what do they help with? | Superior 1/3 of spinal cord; collateral circulation |
| What does the great anterior segmental medullary artery supply and what does it help with? | Inferior 2/3 of spinal cord; collateral circulation |
| What artery is commonly clotted? | Great anterior segmental medullary artery |
| What is a skeletal muscle myotome? | Group of muscles innervated by a single spinal nerve |
| What is a skin dermatome? | Section of skin innervated by a single spinal nerve |
| Where are lumbar punctures done? | Subarachnoid space; L3-L4 |
| What layer of the meninges do lumbar punctures go through? | Dura mater |
| Where does the spinal cord end? | L2 |
| What doesn't form when someone has spina bifida? | Vertebral arch |
Created by:
beranml
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