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Identifying Origins and Insertions

Once you have launched a View from the Anatomy or 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 Anatomy 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) and tap once on the “Show Pins” button. To hide pins for one or more specific structures, select the structure(s) for which you wish to turn off the pins and tap on the “Hide Pins” button. To clear all pins from a View, make sure there are no structures highlighted and then tap on the “Clear All Pins” button.

 

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 tapping once on the “Landmarks On” or “Landmarks Off” button at the left of the screen.

You can identify which muscles attach to bone landmarks by selecting the bone and tapping on the “Show Pins” button at the left of the screen. 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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