The definition of an axis is a real or imaginary line on which something rotates, or a straight line around which things are evenly arranged. An example of axis is an imaginary line running through the earth on which the earth rotates.
The axis, also known as the C2 bone, creates a pivot that allows the C1, or atlas, to rotate. This action gives the head and neck a greater range of motion from side to side. The pivoting motion occurs on part of the bone called the dens, a tooth-like upright section on the bone.
The Quick Answer. The plural of axis is axes.
The atlas is the first cervical (neck) vertebra which is just under the head; it is named for Atlas, the Greek god who supported the world on his shoulders. The axis is the second cervical vertebra; it has what is called the odontoid process about which the atlas rotates.
an alliance of two or more nations to coordinate their foreign and military policies, and to draw in with them a group of dependent or supporting powers. the Axis, (in World War II) Germany, Italy, and Japan, often with Bulgaria, Hungary, and Romania.
axis Sentence Examples
- The plot of land extends on an axis from north-west to south-east over some 36,000 acres.
- The purpose of his paper was to show that there is no problem if the axis is moved to the left.
- Elements of the graph are shown from an axis through 0 and at right angles to OX.
An axis is an invisible line around which an object rotates, or spins. The points where an axis intersects with an object's surface are the object's North and South Poles. In this illustration, Earth's axis is represented by the red line. An axis is an invisible line around which an object rotates, or spins.
The atlas and axis in particular work with the ligaments to move the neck. The atlas and the occipital bone form the atlanto-occipital joint, which allows neck flexion. When you nod your head as if to say "yes," that is neck flexion. The atlas and axis form the atlanto-axial joint, which allows head rotation.
Sagittal axis runs through the body horizontally from the left to right. Frontal axis runs through the body horizontally from the back to front. Movement in the sagittal plane about the frontal axis allows for front somersaults/forward roll.
An axis is a straight line around which an object rotates. Movement at a joint takes place in a plane about an axis. There are three axes of rotation. The sagital axis passes horizontally from posterior to anterior and is formed by the intersection of the sagital and transverse planes.
Planes and axes of movement. All body movements occur in different planes and around different axes. A plane is an imaginary flat surface running through the body. An axis is an imaginary line at right angles to the plane, about which the body rotates or spins.
There are three planes commonly used; sagittal, coronal and transverse. Sagittal plane – a vertical line which divides the body into a left section and a right section.
The medial line is the central axis of the figure, dividing the body vertically into equal right and left haves. (In medical terminology, it is referred to as the midsagittal plane.)
Sagittal plane - a vertical plane that divides the body into left and right sides. Flexion and extension types of movement occur in this plane, eg kicking a football, chest pass in netball, walking, jumping, squatting. Frontal plane - passes from side to side and divides the body into the front and back.
These three axes, referred to as longitudinal, lateral and vertical, are each perpendicular to the others and intersect at the aircraft centre of gravity. Motion around the longitudinal axis, the lateral axis and the vertical axis are referred to as roll, pitch and yaw respectively.
An axis is a straight line around which an object rotates. Movement at the joint takes place in a plane about an axis. There are three axes of rotation. Sagittal axis - passes horizontally from posterior to anterior and is formed by the intersection of the sagittal and transverse planes.
Knee motion is believed to occur about a variable flexion-extension (FE) axis perpendicular to the sagittal plane and a longitudinal rotation (LR) axis. The LR axis is anterior and not perpendicular to the FE axis, the anatomic planes. This offset produces the valgus and external rotation observed with extension.
During push-ups, although the action at the shoulder is in the transverse plane, the movement at the elbow takes place along the sagittal plane, and it is primarily a sagittal plane-oriented exercise. Picture someone performing a bench press on his or her back with perfect form.
Vertical axis
Flexion and extension of the hip occur in the sagittal plane, and about the coronal axis. Abduction and adduction of the shoulder occur in the coronal plane, and about the sagittal axis. Left and right rotation of the atlantoaxial joint occurs in the transverse plane, and about the vertical axis.Anatomical terminology
A coronal plane (also known as the frontal plane) is any vertical plane that divides the body into ventral and dorsal (belly and back) sections. It is one of the three main planes of the body used to describe the location of body parts in relation to each other.axis.An axis is a straight line around which an object rotates. Movement at a joint takes place in a plane about an axis. There are three axes of rotation. The sagital axis passes horizontally from posterior to anterior and is formed by the intersection of the sagital and transverse planes.
The main types of body movements include flexion and extension, abduction and adduction, and rotation.
Medical Definition of circumduction
: movement of a limb or extremity so that the distal end describes a circle while the proximal end remains fixed.C2 (cervical vertebra): C2 is the symbol for the second cervical vertebra, which is also called the axis. It is so-named because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of the second cervical vertebra. The joint between the axis and atlas is a pivot type of joint.
The axis is the second of seven bones in the cervical spine. Another special characteristic of the axis and all other cervical vertebrae is the absence of a body, or large flat portion of the bone. Because these two bones lack this body, the neck has the widest range of motion of all the sections of the spinal column.
Attachments:
- attached to the anterior surface of the vertebral body. longus colli.
- attached to transverse processes. levator scapulae. scalenus medius. splenius cervicis.
- attached to spinous processes. semispinalis cervicis. rectus capitis posterior major.
- attached to posterior surface of lamina. multifidus and longissimus.
Cervical spine. Note uniquely shaped atlas and axis (C1 and C2). The atlas is ring-shaped and does not have a body, unlike the rest of the vertebrae. Fused remnants of the atlas body have become part of C2, where they are called the odontoid process, or dens.
articulates with the anterior arch of the atlas bone, where they form a pivot joint. rotates side-to-side, the atlas bone rotates around the peg-like odontoid process. This is the reason why the second cervical vertebra is also called the axis bone.
C2, Diatomic carbon, a molecule made of two carbon atoms. C2=, ethylene, a two carbon alkene.
Diatomic carbon (systematically named dicarbon and 1λ2,2λ2-ethene), is a green, gaseous inorganic chemical with the chemical formula C=C (also written [C2] or C2. Diatomic carbon is the second simplest form of carbon after atomic carbon, and is an intermediate participator in the genesis of fullerenes.
Cervical spine. Note uniquely shaped atlas and axis (C1 and C2). The atlas is ring-shaped and does not have a body, unlike the rest of the vertebrae. Fused remnants of the atlas body have become part of C2, where they are called the odontoid process, or dens.
