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Anatomy.Chapter.13
Spinal Cord
| Answer | Question |
|---|---|
| Spinal Reflexes | Rapid, automatic nerve responses triggered by specific stimuli. Controlled by spinal cord alone. |
| 31 | Number of spinal cord segments |
| Ventral Root | Contains axons of motor neurons |
| Dorsal Root | contains axons of sensory neurons |
| Roots | Two branches of spinal nerves |
| Dorsal root ganglia | contain cell bodies of sensory neurons |
| Spinal nerve | each side of spine. Dorsal and ventral roots join to form this. |
| Mixed nerves | carry both afferent and efferent fibers |
| afferent | sensory fibers |
| efferent | motor fibers |
| Protect spinal cord, carry blood supply | functions of the spinal meninges |
| Spinal meninges | specialized membranes that isolate spinal cord from surroundings |
| Dura, Arahnoid, and Pia Mater | The three meningeal layers |
| Dura Mater | Tough and fibrous, cranially fuses with periosteum of occipital bone |
| Epidural Space | between spinal dura mater and walls of vertebral canal. Contains loose connective and adipose tissue. |
| Arachnoid Mater | middle meningeal layer |
| arachnoid membrane | covers arachnoid mater |
| subdural space | between arachnoid mater and dura mater |
| subarachnoid space | between arachnoid mater and pia mater. filled with cerebrospinal fluid |
| cerebrospinal fluid (CSF) | carries dissolved gases, nutrients, and wastes |
| pia mater | innermost meningeal layer. bound to underlying neural tissue |
| denticulate ligaments | stabilize side to side movement |
| white matter | superficial matter that contains myelinated and unmyelinated axons |
| gray matter | surrounds central canal of spinal cord |
| gray matter | contains neuron cell bodies, neuroglia, and unmyelinated axons |
| gray horns | projections of gray matter |
| gray commissures | axons that cross from one side of the cord to the other before reaching gray matter |
| nuclei | the functional groups that the cell bodies of neurons form |
| sensory | dorsal nuclei that connect to peripheral receptors |
| motor | ventral nuceli that connects to peripheral effectors |
| three connective tissue layers of spinal nerves | epineurium, perineurium, and endoneurium |
Created by:
elyk01
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