CAPS 391 Lecture Notes - Lecture 16: Lacrimal Canaliculi, Frontalis Muscle, Skeletal Muscle
18 Nov 2015
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Origin: attachment of the muscle that remains stationary during muscle contraction (few exceptions) Insertion: attachment of the muscle that moves during muscle contraction (few exceptions) Function: movement of the muscle (moving the insertion towards the origin or putting them in the same plane) Innervation: somatic nerves (spinal and cranial nerves) that supply the muscles. Occipitifrontalis: formed by the frontal belly (raise eyebrows), galea aponeurotica (connective tissue) and occipital belly. Deep: innervated by cn v. they are involved in mastication: temporalis: origin-temporal fossa, insertion-coronoid process of the mandible (elevates the mandible, masseter: origin-zygomatic arch, insertion-lateral side of the ramus of the mandible (elevated the mandible) Lateral pterygoid: origin-pterygoid process, mandible (protrusion or opening of the mandible) insertion-condylar process of the: medial pterygoid: origin-pterygoid process, insetion-medial side of the ramus of the mandible (elevates the mandible) Extra ocular muscles (7): arise from the ocular cavity, insertions-different points of the eye ball.
