BIO 240 1st Edition Lecture 20 Outline of Last Lecture III Muscle Physiology A Nervous System Muscle System Contraction B Active Channels C Steps of excitation contraction coupling D Sliding Filament Theory E Steps of Sliding Filament Theory Outline of Current Lecture I Intro to Skeletal Muscles of the Body A Quick facts B 4 Functional Groups C Muscle terminology D Skeletal muscles to know Muscles of the head E Head muscles Current Lecture I Intro to Skeletal Muscles of the Body A Quick facts 1 There are over 600 skeletal muscles in the body 2 Around age 30 skeletal muscle can begin being converted into fat B There are 4 functional Groups 1 Prime Movers Agonists Causes a specific body movement 2 Antagonists Oppose reverse or steady a movement of the body 3 Synergists Assist prime movers by adding a little extra force and preventing unwanted movements 4 Fixators Immobilizers of bone and usually serve as the muscles origin C Muscle Terminology 1 Origin The point of attachment that stays fixed during contraction The anchor 2 Insertion The movable attachment of a muscle i Bicep origin on proximal tubercles of humerus and insertion on radius 3 Actions What the muscle does D Skeletal Muscles to know These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Muscle Action Head Muscles 1 Frontalis Epicranius Raises eyebrows 2 Occipitalis Retracts the scalp Galea aponeurotica Connects the frontalis to the occipitalis 3 Temporalis Elevate and retract your jaw 4 Orbicularis oculi Closes eyes 5 Zygomaticus Pulls lips superiorly and posteriorly the act of smiling 6 Orbicularis oris Puckers the lips 7 Masseter Clenches the jaw 8 Mentalis Depresses lower lip Pouting 9 Buccinator Compresses cheek Sucks and whistles 10 Corrugator Depresses eyebrows Scowl E Galea aponeurotica 1 10 Corrugator 3 2 94 5 8 Mentalis 1 6 7 2 F Muscles of the neck Muscle Action 1 Platysema Tenses skin around windpipe 2 Sternocleidomastoid Flexes and laterally rotates the head Saying no 3 Splenius capitis Prime mover of the head Moves the head up and side to side Antagonistic to one another
View Full Document
Unlocking...