Medplexus

Instruction: pick the one best answer. This is also useful on the USMLE step 1. 1. What is the cell body of a neuron called? a. Ganglion b. Soma c. Astrocyte d. Nissl e. Terminal bouton Answer: b A ganglion is a collection of neuron cell bodies outside of the central nervous system. The cell body of a neuron is called a perikaryon or soma. An astrocyte is a supporting cell seen in the central nervous system. The basophilic clusters of ribosomes and rough endoplasmic seen in neuron cell bodies is called Nissl, Nissl bodies or Nissl substance. The terminal bouton is the end portion of an axon. It is also called an axon terminal or end bulb. The terminal bouton will be > associated with another neuron in a synapse. 2. Where is the ependyma found? a. Lining ventricles b. Lining spinal canal c. Covering the brain d. Covering the spinal cord e. Both a and b Answer: e The ependyma lines the ventricles and spinal canal. 3. Which type of neuron is most abundant? a. Sensory neurons b. Motor n

Instruction: pick the one best answer. This is also useful on the USMLE step 1. 1. Which of the following is found in the cerebellum? a. Schwann cells b. Basket cells c. Ganglion d. Neuroglia e. Satellite cells Answer: b Schwann cells are responsible for the myelination of neurons in the peripheral nervous system. Basket cells are a type of neuron seen in the cerebellum. A ganglion is a collection of nerve cell bodies outside of the CNS. Neuroglia are the supporting cells in the central nervous system Sometimes, neuroglia called glial cells or glia. Satellite cells are found in the ganglia of the peripheral nervous system. 2. What are neurons in the retina? a. Unipolar b. Pseudounipolar c. Bipolar d. Multipolar e. Both a and b Answer: c The neurons in the retina are bipolar. Neurons can be classified based on the number of axons and dendrites stemming off of the cell body. A unipolar neuron has one process which branches off of it This process then immediately divides into two. Thus, a

Instruction: pick the one best answer. This is also useful on the USMLE step 1. 1. What is a collection of nerve cell bodies outside of the central nervous system called? a. Schwann cells b. Basket cells c. Ganglion d. Neuroglia e. Satellite cells Answer: c Schwann cells are responsible for the myelination of neurons in the peripheral nervous system. Basket cells are a type of neuron seen in the cerebellum. A ganglion is a collection of nerve cell bodies outside of the CNS. Neuroglia are the supporting cells in the central nervous system Sometimes, neuroglia called glial cells or glia. Satellite cells are found in the ganglia of the peripheral nervous system. 2. What percentage of neurons are interneurons? a. 0.1% b. 1% c. 20% d. 80% e. 99.9% Answer: e Interneurons are the neurons between the sensory and motor neurons. 99.9% of all neurons are interneurons. 3. What are sensory neurons? a. Unipolar b. Pseudounipolar c. Bipolar d. Multipolar e. Both a and b Answer: e Sensory neurons are

Instruction: pick the one best answer. This is also useful on the USMLE step 1. 1. Which of the following is a supporting cell found in the ganglia? a. Schwann cells b. Basket cells c. Ganglion d. Neuroglia e. Satellite cells Answer: e Schwann cells are responsible for the myelination of neurons in the peripheral nervous system. Basket cells are a type of neuron seen in the cerebellum. A ganglion is a collection of nerve cell bodies outside of the CNS. Neuroglia are the supporting cells in the central nervous system Sometimes, neuroglia called glial cells or glia. Satellite cells are found in the ganglia of the peripheral nervous system. 2. Which of the following is an element of the central nervous system? a. Receptors b. Brachial plexus c. Brain d. Ganglia e. Sciatic nerve Answer: c The central nervous system consists of the brain and spinal cord. All other nervous system elements are considered to be in the peripheral nervous system. Thus the peripheral nervous system includes recep