Neurons: The nerve cells are called neurons.
Nervous System: The system which controls and co-ordinates
the various activities of the body is called the nervous system.
Brain Stem: Brain stem is the lower cylindrical part of
the brain that holds up the cerebrum and cerebellum.
Cranium: The part of the skull that encloses the
brain is called cranium.
Midbrain: The midbrain is a small, stalk-like
structure, which connects the pons and the
cerebellum with the cerebral hemispheres.
Cerebrum: The forebrain of an animal is called
cerebrum. The cerebrum consists of two lobes called cerebral hemispheres.
Pons Varolii: Pons
is a strip of tissue which lies below the midbrain and above the medulla
Medulla Oblongata: It is the lowermost part of the brain
stem. It is somewhat cylindrical and is continued behind as the spinal cord.
Cerebellum: It is the part of the brain that lies just
below the cerebrum, dorsal to the brain stem. The cerebellum consists of two
hemispheres called cerebellar hemispheres.
Pituitary Gland: It is the chief endocrine gland of
vertebrates. It secretes a number of hormones that control a wide range of
Spinal Cord: A long, flattened cord of nervous tissue
extending from the medulla to the 2nd lumbar vertebra.
Cranial Nerves: The nerves that are connected with the
brain and emerge out through the openings of the cranium are called cranial
Spinal Nerves: The nerves that arise from the spinal cord
are called spinal nerves.
Receptors: Structures that receive stimuli are called
Effectors: Structures which respond to the various
stimuli are called effectors.
Bioluminiscent: Light producing
Reflex Action: The automatic and rapid response to a
stimulus is called reflex action. Example: the sudden withdrawal of the arm
when it is pricked with a pin.
Reflex Arc: The path through which the impulse travels
during reflex action is called reflex arc.
Synapses: Synapses are connecting links of neurons
associated with reflex action mechanism. For example, the adjustor neuron and
the motor neuron are connected through synapses.