Presentation on theme: "Important Skeletal Muscles"— Presentation transcript:
1Important Skeletal Muscles BIO 210 Chapter 10 Part 2Important Skeletal Muscles
2Warm Up Define & give an example of each of the following. Prime moverSynergistAntagonistFixator musclesName the muscles of the Quadriceps GroupName the muscles of Hamstring Group
3Warm UpDefine & give an example of a muscle that does each of the following.Prime mover-provides most of the force for a movement, forearm flexion, biceps brachii.Synergist-assists, i.e.contract at same time as prime movers, and move the joint the same direction. Brachialis.Antagonist-muscle that extends the prime mover. Triceps brachii is antagonist for biceps.Fixator muscles-stabilize a joint. Deltoid.
4Name the muscles of the Quadriceps Group Rectus femorisVastus medialisVastus lateralisVastus intermediusName the muscles of Hamstring GroupSemitendenosusSemimembranosusBiceps femoris
5Important Skeletal Muscles When we talk about muscle actions of the following muscles, we are referring to the action of the prime mover.Remember that muscles work together.Prime moverSynergistAntagonistFixator muscles
6MUSCLES OF FACIAL EXPRESSION ORBICULARIS OCULIZYGOMATICUS MAJORORBICULARIS ORISBUCCINATOR
10BUCCINATOR: Presses Lips and Cheeks Against Teeth (Blowing, Whistling)
11MUSCLES OF MASTICATION TEMPORALIS: Same as MasseterMASSETER Elevates Mandible (Closes Jaw)
12MUSCLES THAT MOVE THE HEAD STERNOCLEIDOMASTOIDFlexes Head ("Prayer Muscle") (When Both Contract)Turns Head to Side (When Each Contracts Alone)
13EXTERNAL INTERCOSTALS TRUNK MUSCLES - MUSCLES OF THE THORAX NOTE: All of These Muscles Play an Important Role in Respiration.EXTERNAL INTERCOSTALSElevates RibsINTERNAL INTERCOSTALSDepresses RibsDIAPHRAGMEnlarges Thorax (Causes Inspiration)
14TRUNK MUSCLES - MUSCLES OF THE ABDOMINAL WALL EXTERNAL OBLIQUEINTERNAL OBLIQUETRANSVERSUS ABDOMINUSRECTUS ABDOMINUS
16Functions of Muscles of the Abdominal Wall All Four of These Muscles Have the Following Functions:Compress (Tighten) AbdomenRotate Trunk LaterallyAbdominal muscles play important roles in posture; they pull pelvis upward which flattens lumbar curve of the spine.They also aid in defecation, forced expiration, childbirth, etc.Rectus abdominus flexes the trunk of the body.
17UPPER LIMB MUSCLES –MUSCLES ACTING ON THE SHOULDER GIRDLE: Trapezius & Serratus anterior Raises and Lowers Shoulders (Shrugs Shoulders)