Muscular_System lecture notes

Muscular_System lecture notes - MUSCULAR SYSTEM As you...

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MUSCULAR SYSTEM As you study the muscle groups, group them into their different groups, functions, and origins…make flashcards. I. Introduction a. Over 600 skeletal muscles- b. I will provide a muscle list i. Will be on Blackboard before the LAB ii. These are the ones you are responsible for on the lecture exam II. Terms a. Tendon - composed of connective tissue i. CT—connects muscle to bone b. Ligament i. Connects bone to bone c. Origin= the stationary bone i. Place where muscle is attached that does not move when muscle contracts (more stationary bone) d. Insertion= movable bone i. Place where muscle is attached that moves when muscle contracts e. Action i. Movement a muscle produces f. Prime mover (agonist)- does the work i. Muscle primarily responsible for producing an action ii. There are secondary movers… but this is primar-ily involved with the action taking place. g. Synergist i. Group of muscles working with the prime mover to produce the same action h. Antagonist i. Muscles that opposes or does the opposite action ii. Triceps III. Rules a. Muscles pull , they NEVER push i. Result of the sarcomere shortening (muscle contraction of skeletal muscle is this) b. Muscles rarely lie over what they move i. Biceps brachii- results in movement of forearm, but actually exists over humerus—does NOT exist down in forearm. ii. Hence, muscles rarely lie over what they move… there are a couple exceptions… but this is a general rule. c. Generally arranged in pairs—work opposite of e/o i. If you have an agonist, you must have an antagonist. ii. If you have flexors, you must have extensors. IV. Nomenclature (naming muscles) a. Fiber direction
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i. Rectus 1. fibers run with longitudinal axis of body 2. Ex: rectus abdominus: located in midline of abdomen. (The six pack!!). ii. Oblique 1. fibers run at an angle a. external abdominal oblique…using same principle therefore I must have internal abdominal oblique iii. transverse 1. fibers run horizontal (transversly) a. Example: transverse abdominus We’ve just gone over the 3 major muscle groups: transverse abdominus, rectus abdominus, external abdominal oblique/internal oblique You can also name muscles by where they are located: b. Location i. Gives you exact location ii. Tibialis anterior (located by Tibia. . and it’s anterior) …and by the actions they perform… c. Action i. Adductor longus 1. tells you it’s an adductor—moving lower extremity toward the midline… adding something towards you d. Shape or size i. Deltoid 1. shaped like a delta Δ ii. trapezius 1. trapezoid-shaped e. Number of heads of origin i. Biceps brachii (bi=2; ceps=head) (Brachii= in arm; Brachial region) 1. Means “2 headed muscle of the arm” f. Points of attachment i. Sternocleidomastoid muscle 1. Attaches on sternum(sterno), clavicle(cleido), mastoid bone (on skull) 2. Inserts at mastoid bone 3. responsible for movement of vertebral column V. Functions (what PART of the skeleton do they move) i. Does it stabilize my scapula? Does it move my humerus?…
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This note was uploaded on 04/20/2008 for the course BIO 130 taught by Professor Rapps during the Spring '06 term at Carroll WI.

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Muscular_System lecture notes - MUSCULAR SYSTEM As you...

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