NURS 220 Lecture Notes - Lecture 11: Orbicularis Oris Muscle, Rectus Femoris Muscle, Biceps Femoris Muscle
Document Summary
Muscle fiber: endomysium-wrapping of fascia in addition to the cell membrane. Wraps around the cell membrane of a single cell. Muscle fascicle(bundle of single cells): perimysium-wrapping around the bundles of single cells (fascicle). Muscle: epimysium-wrapping around composed bundles of fascicles-creates the whole muscle. Wrapping around whole muscle (on top of muscles)=epimysium. Fascia- saran wrap connective tissue proper made of collagen. a) Tendon-made up of all the coverings, endomysium + perimysium + epimysium. Ties muscle to the bone by connecting beneath the periosteum (covering of the bone). (1) (2) (3) Origin-the bone the muscle connects to that is not going to move. Insertion-the bone the muscle moves as it is contracted. Ex) humuerus is moved when deltoid muscle is contracted (flexion at shoulder). Bones can be origin or insertion places depending on which muscle you are talking about ex) insertion for deltoid muscle, origin for brachialis muscle c)
