Practice online or make a printable study sheet. Collection of teaching and learning tools built by Wolfram education experts: dynamic textbook, lesson plans, widgets, interactive Demonstrations, and more. MathWorld Book. Wolfram Web Resources ». Created, developed, and nurtured by Eric Weisstein at Wolfram Research. List of Partners vendors. The scalene muscles are a muscle group in your neck. You have more than muscles in your neck , head, and face area. The scalenes are made up of three pairs of muscles, with one set located on either side of your body.
When the scalenes are healthy and working in a balanced way, they help support the upright posture of your cervical spine , which is the upper part of your spine. Sometimes the scalenes can give you problems because they're prone to a lot of tension. Before we dive into these conditions and what you can do to loosen your scalenes, let's take a closer look at the three muscle groups that make up your scalenes.
The scalenes resemble this and are positioned on the neck and collarbone similarly. Of the three muscles that make up the scalenes, the anterior is located closest to the front. Like all scalene muscles, it is considered a side neck muscle. It has more than one function.
When acting only on one side of your neck, the anterior scalene can bend and rotate your neck. When both of your anterior scalenes work together, they flex bend your neck. It is considered an accessory breathing muscle because it lifts the first rib during an inhale. The medial scalene scalenus medius resides between the anterior and posterior branches of the scalene muscle.
As with the other muscle branches of this group, your left or right medial scalene can contract move alone, or your medial scalenes can contract together. When only one side contracts, it elevates lifts the first rib to flex and laterally bend move to the side the neck. Like the anterior scalene, the medial scalene muscle is considered an accessory breathing muscle because it lifts the first rib during inhalation.
When both medial scalenes contract, they flex the neck. These actions are similar to those of the anterior scalene because the attachment sites origins and insertions are located near one another. The posterior back scalene occupies the farthest back position of all the scalene muscle branches. Instructors are independent contractors who tailor their services to each client, using their own style, methods and materials.
Scalene Triangle A scalene triangle is a triangle in which all three sides have different lengths. Example 1: In the triangle shown, all the three sides have different lengths. What makes a triangle a triangle? It's defined as a polygon with three line segments that are non-linear and intersect one another.
The points where two or more lines or curves meet are called vertices. Close to the vertex are the angles , which are the spaces between two intersecting lines. Although the real-life objects mentioned above are all triangles, you may notice that they also differ. These objects differ in the length of their respective sides; thus, their angles vary as well. Hence, classifications of triangles depend on the different measures of their angles and the sides of a triangle.
This article will discuss the different classifications of triangles and will focus on acute scalene triangles. Quick questions are placed within each segment to help you assess your knowledge. Types of triangles are determined both in terms of the angle measures and the relative lengths of their sides. The right triangle is composed of only one right angle degree angle. A hypotenuse pertains to the side that is opposite to the right angle.
Students apply the Pythagorean theorem to measure the length of the hypotenuse. This kind refers to a triangle with three acute angles less than 90 degrees. It's often considered the smallest angle.
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