CAPS 391 Lecture 4: Notes Ch4 - Muscular System
2 Feb 2019
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Insertion: usually moves during muscle contraction: moves the insertion towards origin. Innervation: spinal and cranial nerves that cause muscle contraction. Skeletal muscle nomenclature: (named on the following criteria) Location: pectoralis (pectoral region), intercostal (between ribs) , brachialis. Number of heads: biceps brachii (2 origins) , triceps (three origins) Direction of fibres: transversus abdominis, rectus medialis. Superficial muscles: have some attachments to the skin of the face because of which they can move and change tension in the face causing expressions. Also called muscles of expressions : occipitifrontalis (epicranius, occipital bone to frontal bone, occipital belly and frontal belly connected by galea aponeurotica (epicranial. Aponeurosis: all innervated by cn-vii, orbicularis oculi, surrounds the orbital cavity and the eyelids, enables you to close, squeeze eyes and eyelids. Innervated by cn-vii: nasalis, arise from the maxilla and join at the midline, widens your nostrils.
