Question

Crus cerebri is found in
A.Hind brain
B.Fore brain
C.Mid brain
D.Spinal cord

Answer 1

The brain is composed of three parts- the cerebrum, cerebellum and brainstem. The cerebrum part of the brain is divided into right and left cerebral hemispheres, joined by the corpus callosum. It is divided into forebrain, midbrain and hindbrain. The crus cerebri is also known as cerebral crus makes the anterior portion of the cerebral peduncles which are the two stalks that are connected to the cerebrum and the brainstem.

Complete answer:
Option A- Hindbrain
Also known as rhombencephalon which includes medulla oblongata, pons and cerebellum. It consists of cranial nerves IV, V, VI, VII, VIII, IX, X, XI and XII. The functions include sleep, wakefulness, motor activity and respiratory rhythm.
Option B- Forebrain
Also known as prosencephalon which includes cerebral hemispheres and diencephalon. Diencephalon consists of hypothalamus, thalamus, subthalamus and epithalamus. The functions are processing cognitive activities, sensory, associative and voluntary activities.
Option C- Midbrain
Also known as mesencephalon which includes tectum, cerebral aqueduct, tegmentum and the cerebral peduncles. It also consists of corpora quadrigemina in two pairs on the tectum. The functions are vision, hearing, motor control, temperature regulation etc.
Option D- Spinal cord
It is a thin elongated structure which is made up of nervous tissues consisting of neurons, extending from the medulla oblongata in the brainstem to the vertebral column. It consists of a central canal which is composed of grey matter inside and white matter outside along with cerebrospinal fluid.

Hence the correct answer is OPTION(C)

Note: The plural form of cerebral crus is cerebral cura. The fibres of cerebral crus are originated from the cerebral cortex which is composed of the corticopontine tract. The cerebral crus consists of tracts of motor neurons that travel from the cerebral cortex to the pons and spinal cord. There are four lobes present- frontal, parietal, occipital and temporal lobes. Each lobe performs a particular function.