Tag: neurons and synapses

Questions Related to neurons and synapses

Which of the following connects the cerebrum of brain and brain stem?

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. Cerebral peduncles

  2. Corpora bigemina

  3. Corpora quadrigemina

  4. None of the above

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Correct Option: A
Explanation:
  • The cerebral peduncles (also known as the cerebral crus) are the part of the midbrain that links the brainstem and the cerebrum of the brain. 
  • They are the most anterior structure in the midbrain and contain the large ascending and descending tracts that run to and from the cerebrum. Hence, Cerebral peduncles connect the cerebrum of brain and brain stem.
    • So, the correct answer is 'Cerebral peduncles'.

Which of the following gland is present in brain stem?

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. Hypothalamus

  2. Pituitary gland

  3. Pineal gland

  4. All of the above

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Correct Option: C
Explanation:

  • The pineal gland is a small endocrine gland in the brain stem. 
  • The pineal gland produces melatonin, a serotonin-derived hormone which modulates sleep patterns in both circadian and seasonal cycles. 
  • The shape of the gland resembles a pine cone from which it derived its name.
Hence, Pineal gland is present in the brain stem.
So, the correct answer is 'Pineal gland'.

Select the incorrect statement regarding the peripheral neural system.

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. Somatic neural system relays impulses from the CNS to skeletal muscles

  2. Autonomic neural system transmits impulses from the CNS to the involuntary organs and smooth muscles of our body

  3. Sympathetic and parasympathetic neural, systems are the subdivisions of autonomic neural system

  4. Peripheral neural system excludes nerves coming, from brain and spinal cord

Show answer
Correct Option: A
Explanation:

The peripheral neural system has two parts- Automatic Neural System and Somatic Neural system. The PNS consists of all the nerves and ganglia other than that from the brain and spinal cord. SNS is associated with the voluntary control of body and ANS with the involuntary control movements of the body. The SNS consists of afferent nerves or sensory nerves, and efferent nerves or motor nerves. And the ANS consists of sympathetic and parasympathetic neural systems. Since no signal is carried from CNS so statement 1 is the correct answer. 


So, the correct answer is 'Somatic neural system relays impulses from the CNS to skeletal muscles'.


Out of the following features which are specific to mammals only?

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. Corpus callosum

  2. Hairs

  3. Pinna

  4. Homeothermy

  5. Bipedalism

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Correct Option: B
Explanation:
  • Only mammals have hairs. 
  • The hairs grow from the surface layer of the skin. 
  • Lots of hairs clumped together make up this tiger's fur.  A fur coat helps keep the mammal's body temperature at a constant level. 
  • Hence, Hairs  are specific to mammals only
  • So, the correct answer is 'Hairs'.

Which one of the following is the example of the action of the autonomous nervous system ?

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. Swallowing of food

  2. Pupillary reflex

  3. Peristalsis of the intestine

  4. Knee jerk response

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Correct Option: C

Unmyelinated nerve fibres enclosed by schwann cells are commonly found in?

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. central neural system

  2. Somatic neural system

  3. Sympathetic neural system

  4. Both $(2)$ and $(3)$

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Correct Option: A

Brain and spinal cord are the parts of central nervous system.

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The central nervous system (CNS) controls most functions of the body and mind. It consists of two parts: 

the brain and the spinal cord
The brain is the center of our thoughts the interpreter of our external environment, and the origin of control over body movement.

Which of the following best describes the peripheral nervous system?

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. System consisting hormone and neurotransmitter

  2. System consisting spinal cord and motor neurons

  3. System consisting all nerves outside the brain and spinal cord

  4. None of the above

Show answer
Correct Option: C
Explanation:
  • The peripheral nervous system is one of two components that make up the nervous system of bilateral animals, with the other part being the central nervous system. 
  • The PNS consists of the nerves and ganglia outside the brain and spinal cord. Hence, System consisting all nerves outside the brain and spinal cord best describes the peripheral nervous system.
So, the correct answer is 'System consisting of all nerves outside the brain and spinal cord'.

The nervous system develop from which of the following primary germ layer?

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. Endoderm

  2. Mesoderm

  3. Ectoderm

  4. Enteroderm

  5. Epidermis

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Correct Option: C
Explanation:

Neural crest cells of ectoderm migrate downward to form the dorsal root ganglia of the spinal nerves and the postganglionic sympathetic neurons. The sensory cells in the dorsal root ganglia give rise to dendrites extending to sense organs and axons extending into the spinal cord. Some other neural crest cells form parts of certain sense organs and parts of the head. Few head derivatives of the neural crest give rise to sensory nerves and other parts of the peripheral nervous system and ganglia of the autonomic nervous system. Thus, the correct answer is option C.

The innermost layer of meninges is

zoology nervous system of man major divisions of nervous system introduction to control and coordination neurons and synapses

  1. Duramater

  2. Piamater

  3. Arachnoidmater

  4. Cortex

Show answer
Correct Option: B
Explanation:

  • The meninges are three layers of protective tissue called the dura mater, arachnoid mater, and pia mater that surround the neuraxis. 
  • The meninges of the brain and spinal cord are continuous, being linked through the magnum foramen. 
  • In order from the outermost to innermost layer, the meninges are dura mater, arachnoid mater, subarachnoid space, and pia mater. Hence, The innermost layer of meninges is Pia mater.
So, the correct answer is 'Piamater'.