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Origins and Insertions

This section is about Muscle Attachments, Region, Skeleton, and Index Views. For information on Action Views, please see "Viewing Muscle Actions."

Once you have launched a View from the Muscle Attachments, Region Views, Skeleton Views, Index sections, you can identify muscle origins and insertions within that View by using muscle pins or bone landmarks.

Muscle pins:

Red pins mark the location of a muscle’s origin, and blue pins mark its insertion. Tapping once on the head of a pin displays the muscle in the model (if it is not showing already) and labels it with its name. Each pin allows you to navigate between the origins and insertions of that muscle by tapping on the icon(s) to the right of the label.

If you tap on a red pin to view the origin of a muscle, an icon showing a curved arrow and a blue pin will appear next to the text label. Tapping once on this icon causes the model to automatically reorient on the screen to show that muscle’s insertion. The view centers and highlights the blue insertion pin and displays the insertion label. The icon next to the insertion label shows an arrow and a red pin. Tapping on this icon returns you to the origin of the muscle.

Many muscles have multiple origins and/or insertions. In these cases, tapping on one of the pins highlights all other pins of the same type (origin or insertion) for that muscle. Tapping a blue insertion pin, for example, highlights all the insertion pins for that muscle by turning them a brighter shade of blue. A multiple insertion icon showing a straight arrow and multiple pins appears next to the label. Repeatedly tapping on this icon sequentially centers and labels all the insertions of that muscle. A second icon showing a curved arrow and a red pin also appears next to each insertion label, bringing you to the origin(s) of that muscle.

Pins are turned on automatically in Muscle Attachments and Skeleton Views and turned off in Region Views. You can customize which pins are shown by using the buttons at the left side of the screen. To turn on the pins in a View, select the structure(s) for which you would like to view pins (either a muscle or a bone), go to Tools, and tap on Show Pins. To hide pins for one or more specific structures, select the structure(s) for which you wish to turn off the pins, go to Tools, and tap Hide Pins. To clear all pins from a View, go to Tools and tap Clear All Pins.

Bone landmarks:

Red and blue markings on bones show the surface areas where muscles attach. These landmarks are colored red for muscle origins and blue for muscle insertions. Landmarks can be switched on or off for all skeletal structures appearing in a View by going to Tools and tapping Landmarks On or Landmarks Off.

You can identify which muscles attach to bone landmarks by selecting the bone, going to Tools, and tapping on Show Pins. Each red landmark matches up with a red pin (denoting an origin), and each blue landmark matches up with a blue pin (denoting an insertion). Tapping once on the head of the pin shows the muscle and labels it with its name.

For example, the frontal bone of the skull has six red landmarks displayed. Showing the pins and tapping on the pin heads reveals that the temporalis muscles, the corrugator supercilii muscles, and the orbicularis oculi muscles all originate from the frontal bone of the skull.

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