The Skeletal System and Its Movements 21
knee would allow the motion of bending the knee
(knee flexion) in a sagittal plane such as used in a
first-position parallel plié. Examples of dance move-
ments occurring primarily in sagittal (L. sagitta, an
arrow, in the line of an arrow shot from a bow; e.g.,
in an anteroposterior direction) planes are a parallel
brush (dégagé) to the front; torso “contractions”;
raising the arm from a position down by the side,
forward, to an overhead position (shoulder flex-
ion); a forward roll; a forward leap; and performing
a triplet moving forward. These can be thought of
as movements of body segments (an example for the
torso is provided in figure 1.11A) or the whole body
in primarily a forward and backward direction.
- Anteroposterior axis (sagittal axis). An antero-
posterior (AP) axis runs in a front-to-back direction
in a sagittal plane, perpendicular to a frontal plane
and allowing motion in a frontal plane. For example,
the AP axis running through the shoulder allows the
movement of raising the arm to the side (shoulder
abduction) in a frontal plane. Examples of dance
movements occurring primarily in a frontal plane
are a parallel brush (dégagé) to the side, a lateral
bend of the torso (figure 1.11B), a jumping jack, a
cartwheel, and a Russian split. These can be thought
of as movements of body segments or the whole body
in a side-to-side or lateral direction.
- Vertical axis (longitudinal axis). A vertical axis
runs in a superior-inferior direction, perpendicular
to a horizontal plane and allowing motion in a hori-
zontal plane. For example, the vertical axis running
through the spine (from top to bottom) allows the
movement of trunk rotation in the horizontal plane.
Examples of dance movements occurring primarily
in horizontal planes are a torso twist (figure 1.11C),
turnout (hip external rotation), a turn (pirouette),
and a turning jump. These can be thought of as
movements of body segments or the whole body in
a twisting or turning manner.
Students new to anatomical terminology often do
well at picturing these planes relative to anatomical
position as shown in figure 1.9, but have difficulty under-
standing how these planes correlate with functional
TABLE 1.7 Basic Anatomical Axes
Name Definition
Plane
of motion
Movement example
(axis running through hip joint)
Mediolateral (ML) Passes through body from side to side Sagittal Parallel dégagé (front)
Anteroposterior (AP) Passes through body from front to back Frontal Parallel dégagé (side)
Vertical Passes through body from top to bottom Horizontal Turning out while standing in first
position
FIGURE 1.11 Dance vocabulary showing movement of the trunk in the (A) sagittal, (B) frontal, and (C) horizontal plane.