Question

Bundle of His is a network of
A. Muscle fibres distributed throughout the heart walls
B. Muscle fibres found only in the ventricle wall
C. Nerve fibres distributed in ventricles
D. Nerve fibres found throughout the heart

Answer 1

A bundle of nodal fibres that is atrioventricular bundle arises from atrioventricular node which passes through atrio-ventricular septa to emerge on the top of interventricular septum and immediately divides into right and left bundle.
These branches give rise to minute fibres called purkinje fibres throughout the ventricular musculature of the respective sides. The purkinje along with right and left bundles are known as bundles of his.

Complete answer:
Muscle fibres distributed throughout the heart walls:- it arises through atrioventricular nodes and hence not distributed in the whole heart. Hence the option is not correct.
Muscle fibres found only in the ventricle wall:- they arise from atrioventricular septum and are muscular in nature. Hence this option is correct.
Nerve fibres distributed in ventricles:- they are not nerves but muscular. Hence this option is not correct.
Nerve fibre is found throughout the heart:- they are only found in ventricles so this option is also not correct.

Our correct option is B.

Note:
The entire heart is made up of cardiac muscles. A specialised cardiac musculature called the nodal tissue is also distributed in the heart. A patch of this tissue called the Sino-atrial node is present in the upper right corner atrium. Another mass of this tissue called atrioventricular node is present in the lower left corner of the right atrium.