Term
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Definition
Origin: Manubrium.
Insertion: Skull
Action: Turns head (if only one muscle contracts); depresses head if both muscles contract at the same time. |
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Term
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Definition
Origin: First costal cartilage
Insertion: Hyoid bone.
Action: A) Pulls the hyoid caudally when the ribs are fixed.
B) raises the ribs and sternum when they hyoid is fixed. |
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Term
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Definition
Origin: The cricoid cartilage of the larynx.
Insertion: Medial raphe, beginning at the midline of the mandible and extending posteriorly from that point along the midline.
Action: Raises the floor of the mouth and pulls the hyoid forward. |
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Term
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Definition
Origin: A) Occipital bone. B) Tip of the mastoid process of the skull.
Insertion: Ventral border of the mandible.
Action: Depresses the lower jaw. |
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Term
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Definition
Origin: Stylohyal bone of the hyoid
Insertion: Midventral surface of the body of the hyoid
Action: Raises the hyoid |
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Term
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Definition
Origin: The clavicle.
Insertion: the mastoid process of the skull. Note: the origin and insertion of this muscle may be revversesd as far as the net effect of its contraction is concerned.
Action: A) pulls the head laterally when muscle on one side contracts and the clavicle is stationary.
B) pulls the clavicle craniad when the skull is stationary. |
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Term
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Definition
Origin: First costal cartilage.
Insertion: Thyroid cartilage of the larynx
Action: Pulls the larynx caudad. |
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Term
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Definition
Origin: Thyroid cartilage of the larynx.
Insertion: Hyoid bone
Action: raises the larynx |
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Term
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Definition
Origin: cricoid cartilage of the larynx
Insertion: Thyroid cartilage of the larynx
Action: Tensor of the vocal cords. |
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Term
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Definition
Origin: Medial surface of the mandible
Insertion: Ventral surface of the body of they hyoid
Action: Pulls the hyoid craniad. |
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