Welcome to this presentation on the vestibular system.
The first thing that I want you to understand is
the sensory receptors that are associated with the vestibular system,
the system that keeps us in
balance and equilibrium. We’ll go through the location of
these sensory receptors. Then it’s important
for you also to understand the functional considerations of
these receptors. First up is the macula.
This is found in the utricle and the saccule.
The purpose of the macula is to keep the head in a correct position
relative to gravity. The utricle, we see in in this particular area,
the macula, in this region, is oriented horizontally
So it´s gonna detect linear acceleration in a horizontal direction.
The saccule, which I show right in through here,
this is going to have the macula oriented in a
vertical position. So this will detect linear acceleration.
Another structure to consider as a sensory receptor is that of the
crista ampullaris. The crista ampullaris is
associated with the semicircular ducts. We see them outlined in
through here. There are three of them.
Here is one, two and, then three and they are oriented in three
different planes. The crista ampullaris
associated with each semicircular duct is going to detect angular
acceleration movements of the head.