Term
Occipitofrontalis (epicranium)
Frontal Belly |
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Definition
| draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in look of surprise |
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Term
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Definition
- Occipitofrontalis
- draws scalp posteriorly
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Definition
| Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech. |
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Definition
| Draws angle of mouth superiorly and laterally, as in smiling. |
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Definition
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Presses cheeks against teeth and lips, as in whistling, blowing, and sucking; draws corner of mouth laterally; and assists in mastication (chewing) by keeping food between the teeth (and not between teeth and cheeks).
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Definition
| Elevates and protrudes lower lip and pulls skin of chin up, as in pouting. |
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Definition
| Draws outer part of lower lip inferiorly and posteriorly as in pouting; depresses mandible. |
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Definition
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Definition
| Elevates mandible, as in closing mouth. |
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Definition
| Elevates and retracts mandible. |
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Term
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Definition
| Acting together (bilaterally), flex cervical portion of vertebral column, extend head at atlanto-occipital joints; acting singly (unilaterally), laterally flex neck and head to same side and rotate head to side opposite contracting muscle. Laterally rotate and flex head to opposite side of contracting muscle. Posterior fibers of muscle can assist in extension of head. RMA: Elevate sternum during forced inhalation. |
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Definition
| Flexes vertebral column, especially lumbar portion, and compresses abdomen to aid in defecation, urination, forced exhalation, and childbirth. RMA: Flexes pelvis on the vertebral column. |
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Definition
| Acting together (bilaterally), compress abdomen and flex vertebral column; acting singly (unilaterally), laterally flex vertebral column, especially lumbar portion, and rotate vertebral column. |
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Definition
| Acting together, compress abdomen and flex vertebral column; acting singly, laterally flex vertebral column, especially lumbar portion, and rotate vertebral column. |
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Definition
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Definition
| Contraction of diaphragm causes it to flatten and increases vertical dimension of thoracic cavity, resulting in inhalation; relaxation of diaphragm causes it to move superiorly and decreases vertical dimension of thoracic cavity, resulting in exhalation. |
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Definition
| Contraction elevates ribs and increases anteroposterior and lateral dimensions of thoracic cavity, resulting in inhalation; relaxation depresses ribs and decreases anteroposterior and lateral dimensions of thoracic cavity, resulting in exhalation. |
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Definition
| Contraction draws adjacent ribs together to further decrease anteroposterior and lateral dimensions of thoracic cavity during forced exhalation. |
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Definition
| Depresses and moves clavicle anteriorly and helps stabilize pectoral girdle. |
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Definition
| Abducts scapula and rotates it downward. |
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Definition
| Abducts scapula and rotates it upward. |
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Term
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Definition
| Superior fibers upward rotate scapula; middle fibers adduct scapula; inferior fibers depress and upward rotate scapula; superior and inferior fibers together rotate scapula upward; stabilizes scapula |
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Definition
| Elevates scapula and rotates it downward. |
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Definition
| Elevates and adducts scapula and rotates it downward; stabilizes scapula. |
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Definition
| Elevates and adducts scapula and rotates it downward; stabilizes scapula. |
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Term
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Definition
- erector spinae
- Acting together, muscles of each region (cervical, thoracic, and lumbar) extend and maintain erect posture of vertebral column of their respective regions; acting singly, laterally flex vertebral column of their respective regions to same side as contracting muscle.
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Term
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Definition
- erector spinae
- Acting together, both longissimus capitis muscles extend head and extend vertebral column; acting singly, rotate head to same side as contracting muscle.
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Term
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Definition
- erector spinae
- Acting together, muscles of each region (cervical, thoracic, and lumbar) extend vertebral column of their respective regions and extend head.
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