The Anatomy and Physiology of Animals/Nervous System Worksheet/Worksheet Answers

1. The diagram below is of a nerve cell or neurone.


 * i. Add the following labels to the diagram.
 * Axon; Myelin sheath; Cell body; Dendrites; Muscle fibres;


 * ii. If you like, colour in the diagram as suggested below.


 * Axon - purple;
 * Myelin sheath - yellow;
 * Cell body - blue;
 * Dendrites - green;
 * Muscle fibres – red;


 * iii. Now indicate the direction that the nerve impulse travels.



2. There are three different kinds of neurone or nerve cell. Match each kind with its function.
 * A. Motor neuron;   B. Sensory neuron;       C. Relay neuron;

3. Match the descriptions in the table below with the terms in the list.

4. The diagram below shows a cross-section of the spinal cord. Add the following labels to the diagram.


 * Central canal;    White matter;     Dorsal root;     Grey matter;  Ventral root; Skin;
 * Muscle; Sensory neuron;  Relay neuron; Motor neuron; Pain receptors in skin



5.
 * a)	List in order the 3 different neurons involved in a reflex arc from the stimulus to the response.


 * b) Name 3 different reflexes found in animals.

Reflex 1. Blink reflex.

Reflex 2. Paw pinch reflex.

Reflex 3. Swallowing reflex, plus many others.

6. The diagram below shows the nervous system of a horse. Add the following labels.
 * Brain; Spinal cord; Cranial nerves; Spinal nerves; Sciatic nerve; Nerves of the autonomic nervous system; Vagus nerve; Network of nerves to forelimb.



7. Indicate whether the following parts of the nervous system are part

of the Central Nervous System CNS) or the Peripheral Nervous System (PNS).

8. The diagram below shows a section of a dog’s brain. Add the labels

in the list below and, if you like, colour in the diagram as suggested.


 * Cerebellum - blue;
 * Spinal cord - green;
 * Medulla oblongata - orange;
 * Hypothalamus - purple;
 * Pituitary gland - red;
 * Cerebral hemispheres – yellow.



9. Match the descriptions below with the terms in the list. You may need to use some terms more than once.

10. Match the descriptions below with the parts of the nervous

system in the list. You may need to use some terms more than once.

11. Name the nerves described below using the choices in the list.