What is the role of the macula in the utricle and saccule?
What is the role of the macula in the utricle and saccule?
The vestibule is a region of the inner ear which contains the saccule and the utricle, each of which contain a macula to detect linear acceleration. The macula of saccule lies in a nearly vertical position. Its function is to detect vertical linear acceleration.
What is the macula in the vestibular system?
Vestibular Apparatus: 2) macula of the saccule — the sensory spot in the wall of the saccule; it detects linear acceleration in the vertical plane (up and down).
Are the utricle and saccule in the vestibule?
Gross anatomy The vestibule is located within the bony labyrinth (temporal bone) of the inner ear 2 (inferior to the semicircular canals 1). The utricle and the saccule are co-located within the vestibule 3. The utricle lies on the medial wall of the vestibule and is in contact with the recessus ellipticus 2.
What is the function of macula?
The macula is located near the center of the retina; its function is to process harp, clear, straight-ahead vision. The retina is the paper-thin tissue that lines the back of the eye and contains the photoreceptor (light sensing) cells (rods and cones) that send visual signals to the brain.
What is the purpose of the macula in the ear?
In vertebrates the utricular maculae in the inner ear contain an otolithic membrane and otoconia (particles of calcium carbonate) that bend hair cells in the direction of gravity. This response to gravitational pull helps animals maintain their sense of balance. Encyclopædia Britannica, Inc.
Which membrane is found in the maculae of the saccule and utricle?
The macula in the utricle and saccule contains an array of hair cells whose stereocilia project into the otolithic membrane, a gelatinous mass that contains tiny crystals of calcium carbonate, called otoliths (literally, “ear stones”).
Where are macula found?
the retina
The macula is located near the center of the retina; its function is to process harp, clear, straight-ahead vision. The retina is the paper-thin tissue that lines the back of the eye and contains the photoreceptor (light sensing) cells (rods and cones) that send visual signals to the brain.
Which structures are within the vestibule?
Within the vestibule are two regions lined by the membranous labyrinth; the utricle, which is closer to the semicircular canals, and the saccule, which is closer to the cochlea. Three semicircular canals, which lie at right angles to each other in three planes, arise from the posterior vestibule.
What is the vestibule composed of?
It consists of an anterior chamber and the cochlear duct, which subserves hearing and connects by way of the round saccule with the peripheral vestibular apparatus. The peripheral vestibular apparatus consists of the saccule, utricle, and semicircular canals.
What is the macula vs fovea?
The macula is the pigmented part of the retina located in the very center of the retina. In the center of the macula is the fovea, perhaps the most important part of the eye. The fovea is the area of best visual acuity. It contains a large amount of cones—nerve cells that are photoreceptors with high acuity.
What is macula made of?
The macula consists of two ganglion cell layers and at the centre it comprises of the fovea. The fovea is a pit made up of cone cells and has no rods; the fovea’s function is to ensure that the eye provides a central vision of a high resolution. The fovea is also responsible for individuals colour perception ability.
What are macula Utriculi?
The macula of utricle (macula acustica utriculi) is a small (2 by 3 mm) thickening lying horizontally on the floor of the utricle where the epithelium contains vestibular hair cells that allow a person to perceive changes in latitudinal acceleration as well as the effects of gravity; it receives the utricular filaments …