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Chp 10
Muscular System: The Axial
Question | Answer |
---|---|
Axial musculature | arises from and inserts onto the Axial Skelton. Positions head and vertebral column. Moves ribs- assists in breathing. 60% of skeletal muscle. |
Appendicular musculature | Stablizes components of appendicular skeleton- moves components of it. |
Muscles of head and neck | Groups of axial musculature muscles |
Muscles of vertebral column | Groups of axial musculature muscles |
Muscles of abdominal wall | Groups of axial musculature muscles |
Muscles of pelvic floor | Groups of axial musculature muscles |
Muscles of facial expression | orbicularis occuli, buccinator, orbicularis oris |
Origin of Orbicularis occuli | Medial margin of orbit |
Insertion Orbicularis occuli | Skin around eyelids |
Action Orbicularis occuli | Closes eyes |
Innervation Orbicularis occuli | Facial Nerve (N VII) |
Origin Buccinator | Alveolar processes of maxilla and mandible |
Insertion Buccinator | Blends into fibers of orbicularis oris |
Action Buccinator | Compresses cheeks |
Innervation Buccinator | Facial Nerve (N VII) |
Origin Orbicularis Oris | Maxilla and Mandible |
Insertion Orbicularis Oris | Lips |
Action Orbicularis Oris | Compresses, purses lips |
Innervation Orbicularis Oris | Facial Nerve (N VII) |
Muscles of Mastication | Acts on mandible- Masseter muscle, temporalis muscle, pterygoid muscle |
Mastication muscles that Open AND Close mouth | Pteryoid muscles. Lateral- OPENS. Medial- CLOSES. |
Muscles of mastication that closes mouth | Temporalis Muscle & Masseter Muscle |