Tag: the structure of brain

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Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Most of the involuntary actions are controlled by 

  1. Medulla oblongata

  2. Cerebrum

  3. Cerebellum

  4. Diencephalon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Involuntary actions are those action that controlled by medulla oblongata which is a part of the autonomous nervous system where as voluntary actions are controlled by the cerebellum. The medulla oblongata directly controls heartbeat, blood pressure, breathing and digestion. It is located in the hindbrain, anterior to the cerebellum. It is a cone-shaped and contains the cardiac, respiratory, vomiting and vasomotor centers. Hence, the correct answer is option A.

Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Optocoel cavity is found in the brain of

  1. Rabbit

  2. Man

  3. Frog

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mid Brain of frog consists of two large optic lobes and crura cerebri. These optic lobes are centres for impulses coming to the eyes. They are hollow having cavities known as optocoel which communicates with the fourth ventricle behind a narrow cavity, iter. Hence, the correct answer is option C.

Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

When the medulla oblongata is compressed, then what will happen?

  1. Immediately die

  2. Die after few hours

  3. Live for an hour and after that it may die

  4. No effect
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The medulla oblongata is the part of the brainstem, that is situated between the pons and the spinal cord.
  •  The medulla contains the cardiac, respiratory, vomiting and vasomotor centers and therefore deals with the autonomic (involuntary) functions of breathing, heart rate and blood pressure. 
  • Thus compression of the medulla oblongata will lead to instant death.
  • So, option A is correct here.
Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Which statement is wrong about the function of brain?

  1. Hypothalamus mainly controls autonomic nervous system.

  2. Voluntary muscle activity is started by cerebellum.

  3. Medulla oblongata regulates involuntary activity of our body.

  4. Thalamus is responsible for crude sensation.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The hypothalamus and the brain stem controls the autonomic nervous system. They have control on the various functions like the respiration rate, heart rate, blood pressure, digestion, sweating, etc. The motor cortex area in the cerebrum is responsible for voluntary muscle activity. The cerebellum helps in coordinating the voluntary movements. Medulla oblongata is the brain stem which controls many involuntary activities like respiration, blood pressure, etc. The spinothalamic pathway is the tract followed by the sensation from skin to thalamus.

So, the correct answer is option B.

Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Which of the following is not correctly matched?

  1. Forebrain - Olfaction

  2. Hypothalamus - Pituitary

  3. Cerebellum - Balance

  4. Medulla oblongata- Temperature regulation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The medulla oblongata controls autonomic functions like breathing, heart rate, and blood pressure. Temperature regulation is primarily the function of the hypothalamus, not the medulla.

Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Crura cerebri consist of

  1. Longitudinal bands of nerve fibres

  2. Transverse bands of nerve fibres

  3. Oblique bands of nerve fibres

  4. Bands of nerve fibres that cross each other
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The midbrain is a small and contracted region of the brain. The anterior region of the midbrain is made up of two longitudinal bands of myelinated nerve fibres called the cerebral peduncles or crus cerebri or crura cerebri. The posterior part of the midbrain is made up of projected optic lobes called the colliculi.

Hence, the correct answer is 'Longitudinal bands of nerve fibres'

Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Optic thalami are

  1. Optic lobes

  2. Optocoels

  3. Lateral walls of diencephalon

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The diencephalon is the small and posterior region of the forebrain. It is made up of the following parts:

  1. Thalamus/optic thalami: It forms the upper lateral walls of the diencephalon and makes up about 80% of the diencephalon. It is the relay centre of the brain.
  2. Hypothalamus: It forms the lower lateral wall of the diencephalon. It is called the thermostat of the body.
  3. Epithalamus: It forms the roof of the diencephalon. The pineal body is present in it.
Hence, the correct answer is 'Lateral walls of diencephalon'

Multiple choice biology nervous system of man human nervous system the structure of brain the human brain

Epiphysis is connected with

  1. Brow spot in embryo

  2. Hypophysis

  3. Optic lobes

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The epiphysis or the pineal body is an endocrine gland that develops from the roof of the diencephalon. During the embryo development, it is connected with the brow spot in the embryo. The brow spot is the region between the two eyes. The cells are considered to be the modified neurological cells. It secretes a hormone called the melatonin that regulates the diurnal cycle of the body. Hence, the correct answer is 'Brow spot in embryo'