Question

The projecting ridge in the ampulla of semicircular canals in-ear is called
A. Succus entericus
B. Macula
C. Otolith
D. Crista ampullaris
E. Cochlea

Answer 1

Hint: Canal encompasses a swelling (ampulla) that contains the cupula, a cluster of sensitive hairs embedded during a thick mound. Because the head moves within the plane of a given canal, motions of the fluid deflect the cupula to supply nerve impulses.

Complete answer:
The ampulla may be a localized dilatation at one end of the curved duct. A patch of innervated hair cells is found at the bottom of the ampulla during a structure termed a crista (meaning crest). The crista contains hair cells with stereocilia oriented during consistent directions.
According to options,
A) Succus entericus, conjointly referred to as secretion, is the fluid secreted in the intestine.
B) Macula is that sticking ridge of saccule and utricle that are otolith organs of a labyrinth.
C) Otolith may be a structure of carbonate in the vestibular system of the inner ear.
D) Crista ampullaris is that sticking ridge of the ampulla of semicircular canals. Generally, the crista ampullaris is the sensory organ of rotation. Commonly they are found in the ampullae of each of the semicircular canals of the inner ear, meaning that there are 3 pairs in total. The main function of the crista ampullaris is to sense angular acceleration and deceleration I.e. Balancing.
E) Cochlear is a tube-shaped structure that is the part of the labyrinth that contains the organ of hearing i.e. organ of Corti.

Hence the correct answer is option ‘D’.

Note: Each slender duct has one ampulla. Once the pinnacle turns, fluid in one or a lot of semicircular ducts pushes against the cupula and bends the cilia of the hair cells. The 3 curving canals of the body structure are selected per their position: superior, horizontal, and posterior. The superior and posterior canals are in diagonal vertical planes that see at right angles.