Question | Answer |
Nerves | bundle of axons |
Neuroglial Cells | Specialized cell of nervous system that produces mylin, communicates btwn cells, and maintains the ionic environment. |
Cell Body | Major part of neuron |
Myelin Sheath | Fatty material that forms a sheathlike covering around axon. |
Central Nervous Sysytem | Formed by brain and spinal cord |
Axon | Nerve fiber that carries info away from cell. |
Neurilemma | Surronds the myelin sheath, composed of schwann cells. |
Neurofibrils | fine threads that extend into the axons and support them. |
Autonomic Nervous System | Motor portion of nervous system, controls subconsious actions (invoulentary)"heart rate" |
Nodes of Ranvier | Narrow gaps in the mylin sheath btwn schwann cells. |
Peripheral Nervous System | Composed of Cranial and Spinal nerves |
Neurons | Nerve cell specialized to react to chemical and physical changes in their surroundings. |
Synaptic Cleft | Space seperating the end of the axon and surface of another cell. |
Chromatophilic Substance | Membranous packets that consist of rough endoplasmic reticulum in the cytoplasm. |
Nerve Impulses | Bioelectric signals sent from the axon. |
Dendrites | Recieve the input from neurons on a change that took place. |
Somatic Nervous System | Motor portion of peripheral nervous system. Involved in voulentary activities, such as skeletal muscle contraction. |
Schwann Cells | Neurogial cells that surround the axon. |
Sensory Receptors | At ends of peripheral neurons and provide the sensory function of the nervous system. Gathers info by detecting change in and outside of body, monitors external environment. |
Synapses | small spaces btwn neurons |
Neurotransmitters | Messenger molecules that carry messages from neuron to neuron. |