Question

Crura cerebri consists of
A. Longitudinal bands of nerve fibres
B. Transverse bands of nerve fibres
C. Oblique bands of nerve fibres
D. Bands of nerve fibres that cross each other

Answer 1

Crura cerebri is the anterior portion of cerebral peduncle and it consists of motor tracts which travels from cerebral cortex to spine and pons.

Complete Answer:
Let us analyse the options to find the correct answer,
Option A: The midbrain region is defined as a small and contracted region present within the brain. The anterior region of this midbrain is composed of two longitudinal bands of myelinated nerve fibres which are also known as the cerebral peduncles or crura cerebri or crus cerebri. The posterior region of the midbrain is composed of projected optic lobes which are known as colliculi. therefore, this is the correct option.

Option B: Transverse bands of nerve fibres are commonly seen in pons corolla and not in crura cerebri. Therefore, this is the incorrect option.

Option C: Oblique bands of nerve fibres seen in corpus callosum and not in crura cerebri. Therefore, this is the correct option.

Option D: Bands of nerve fibres that cross each other are seen in corpus callosum and not in crura cerebri. Therefore, this is the correct option.

Thus, the correct option is A)Longitudinal bands of nerve fibres.

Note: The significance of crura cerebri is that it acts like a connecting link between cerebral hemispheres and pons. The fibers originate from the cerebral cortex.