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Simple bony crus Crus osseum simplex

The simple bony crus is the non-ampullated end of the lateral semicircular canal of the inner ear.

The inner ear consists of a number of structures. Some structures are designed to convert mechanical energy, that is transmitted to the inner ear in the form of waves into neural impulses that are then interpreted as sound, while other structures are important in the maintaining of postural balance and a visual focus or gaze fixation on a single object. As such, the structures making up the inner ear can be divided into three parts as follows:va cochlear component whose function is mainly concerned with the process of hearing, a vestibular component that is comprised of the utricle and the saccule (this component of the inner ear deals with balance when one is stationary) and a semicircular component whose function to regulate balance while in motion.

The semicircular component of the inner ear is comprised of three bony semicircular canals projecting from the vestibule in different directions. These three canals are; the superior or anterior semicircular canal, the posterior semicircular canal and the lateral semicircular canal. Each of the three semicircular canals are occupied by a semicircular duct. In addition, each canal possesses one enlarged end known as the bony ampulla and opens into the vestibule independently.

The anterior and posterior semicircular canals fuse at their non-ampullated ends forming what is known the common bony crus, whereas the non-ampullated, non fused end of the lateral semicircular canal is known as the simple bony crus.

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