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Chp 10

Muscular System: The Axial

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
Created by: afogel