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The Muscular System

The Muscular System. Cindy Quisenberry. Functions of the Muscles. What is the major function of the muscles? Movement – walking, running, etc. Digest Food Pumps blood throughout your body Provide stability Movement of substances ( ie : urine) Help control body temperature.

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The Muscular System

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  1. The Muscular System Cindy Quisenberry

  2. Functions of the Muscles • What is the major function of the muscles? • Movement – walking, running, etc. • Digest Food • Pumps blood throughout your body • Provide stability • Movement of substances (ie: urine) • Help control body temperature

  3. Skeletal Muscles • Provide movement • Help maintain posture • Protect internal organs • Produce heat and energy for the body

  4. Muscle Types

  5. Muscle Types • Voluntary - muscles can be contracted at will • Skeletal– helps us get through our environment safely and successfully • Involuntary- muscles govern movement that is not controlled by will, such as respiration and digestion. • Cardiac – responsible for pumping blood through little tubes known as blood vessels • Smooth – responsible for filling and emptying blood vessels and all hollow organs, plus they control the movement of air through the bronchi tubes.

  6. Movement takes place at the joint and uses the: • Muscles • Ligaments • Tendons

  7. Bursa • a sac lined with a synovial membrane that helps the movement of joints

  8. Skeletal Muscles: • Keep in mind that voluntary movement requires three main systems • Skeletal • Muscular • Nervous

  9. Muscle Rules: • Rule #1 • Muscles must have at least 2 attachments • Muscles must cross at least one joint • Rule #2 • To produce movement, muscles ALWAYS pull and get shorter. • Which attachment is moving to the other? Is the proximal attachment moving to the distal or is the distal moving to the proximal?

  10. Muscle Rules: • The attachment that remains in its “original” position is known as the ORIGIN. This attachment anchors the muscle. • The distal attachment (the one that is moving) is the INSERTION.

  11. Spaghetti: • Muscle cell = Muscle fiber • Can one muscle fiber be strong enough to pull on the wrist and bring it up? • Fascicle - “TEAM Fascicle” • Muscle fibers with buddies • Can generate more pull • Connective Tissue – Fascicle needs connective tissue support so that is can work together more efficiently • Perimysium – Peri = ?

  12. Spaghetti: • Find: • The two attachments of the fascicle • Notice that the muscle cells are ALWAYS pointing to the attachments • Notice how you can still see the muscle fibers through the Connective Tissue (CT)

  13. Muscle Rules: • Rule #3 • Muscles fibers or “striations” ALWAYS POINT to their attachments and show the direction of pull.

  14. Spaghetti: • Even though one fascicle can pull on the attachment, one “team fascicle” cannot produce a tremendous amount of force. There needs to be many teams working together to get force and power to maintain stability in joints and forceful movements. • Epimysium – connective tissue that hold a bunch of fascicles together

  15. Belly of the Muscle: Tendon Dense Regular CT Belly

  16. Belly of the Muscle: Epimysium – epi = ?, myo = ? Sometimes also called Fascia = Epimysium Fascicle – covered by Perimysium Tendon Muscle Fiber covered by Endomysium Endo = ? Dense Regular CT Belly

  17. Muscle Rules: • Rule #1 • Muscles must have at least two attachments cross at least one joint. • Rule #2 • Muscles can only “pull” and get shorter. • Rule #3 • Muscles fibers or “striations” ALWAYS POINT to their attachments and show the direction of pull.

  18. Identification of Muscle Movement & Location: • Ventral • Ventral Side of the Forearm • When a muscle moves ventral to ventral it is a FLEXOR! (The angle between the ventral sides is decreased) • Show placement for flexor of the forearm. • Place attachments for flexor of the hip.

  19. Identification of Muscle Movement & Location: • Because muscles can only pull, how can you get your wrist back from flexion? • Show me where would you place your left hand muscles to do this?

  20. Identification of Muscle Movement & Location: • Dorsal • Muscles that move the dorsal side towards the dorsal side are know as EXTENSORS!

  21. Identification of Muscle Movement & Location: • V is for Ventral (peace sign on chest) • Ventral side will be lighter then the Dorsal side • This is the theme throughout the animal kingdom. • Reach and touch the back of your neck. This is the Dorsal side. • The back of your torso and arms are the Dorsal side (darker side).

  22. Identification of Muscle Movement & Location: • What about the legs? • The Ventral/Dorsal relationship is about movement and not based on the standard Anatomical Position – the legs are special.

  23. Identification of Muscle Movement & Location: • Frog Position • Stand up and turn your knees and toes outward • Place your hands on the inside of your legs, now become a biped by rotating your knees and toes inward. • Your hands rotate towards the back . . . So the Ventral side rotates back when you become a biped.

  24. Identification of Muscle Movement & Location: • Frog Position • Stand up and turn your knees and toes outward • Place your hands on the outside of your legs, rotate your legs back in and notice how your hands rotate to the front. • This is the Dorsal side rotating to the front . . . So the Dorsal side rotates forward when you become a biped.

  25. Identification of Muscle Movement & Location: • Summary • The Ventral side rotates to the back at the hips and the dorsal side is rotated to the front. • Place your right hand on your chest and your left hand on the back of your left leg. • These areas are the VENTRAL side of the body! • Ventral side has FLEXORS only. • Dorsal side is where EXTENSORS are located! • Fetal position is FLEXION! (Flexion is the ventral side of the body.)

  26. Anatomical Position – not about movement • Arms are positioned to have the thumbs outward (pointing lateral/outward) • Anterior & Posterior • Ventral & Dorsal

  27. Identification of Muscle Movement & Location: • Hip Flexion • Hip Extension • Dorsiflexion (extension) • Plantar Flexion

  28. Muscles work in opposing pairs • If a muscle can flex (ventral location) a joint, then there is an opposite muscle on the other side that extends the joint (dorsal location). • If there is a muscle that rotates a joint one way, then there has to be a muscle on the opposite side that will rotate the muscle back (ie: supinator rotates the palm up and pronator rotates the palm down)

  29. Muscle Names • What does the name tell us? • If the name of a bone or regional area of the body is used in the first part of the muscles name or is the muscle’s name, THAT IS THE MUSCLE’S ORIGIN!

  30. Muscle Names • Example: • Sternocleidomastoid • Sterno = sternum and the Cleido = clavicle (origins) • Mastoid = mastoid process of the temporal bone (insertion) • This muscle gives its attachments.

  31. Muscle Names • Sometimes muscles are named after their job. • Flexor PollicusLongus tells that the muscle flexes the thumb (it is on the ventral side of the body and it is a flexor) • Sometimes muscles are named by their shape or location in the body. • Rhomboid muscles are rhomboid shape and Tibialis anterior tells us that the muscle is located on the front of the tibia.

  32. Main Functions of the Muscles • What is the major function of the muscles? • Movement – walking, running, etc. • Digest Food • Pumps blood throughout your body • Provide stability • Movement of substances (ie: urine – urinary sphincter) • Help control body temperature

  33. Skeletal Muscles • Provide movement • Help maintain posture • Protect internal organs • Produce heat and energy for the body

  34. Bursa • a sac lined with a synovial membrane that helps the movement of joints

  35. Movement takes place at the joint and uses the: • Muscles • Ligaments • Tendons

  36. Review .

  37. ___________________are involuntary muscles. Muscles that act on the lining of the body’s passageways and the hollow internal organs

  38. ______________________is involuntary and is responsible for the contraction of your heart. Your heart beats 100,000 times each day. A type of striated muscle that forms the wall of the heart .

  39. Most of your muscle tissue is skeletal, and almost all _________________ are under voluntary control. Muscles attached to bone that cause body movements

  40. Musculoskeletal Structure • Tendons – anchor muscles to bone • Bursas – lie between some tendons and the bones beneath them. Bursas are lined with synovial fluid – making it easier for the tendon to slide over a bone when the tendon shortens

  41. Musculoskeletal Structure • What would the term be for inflammation of the bursa? • What would the term be for inflammation of a tendon?

  42. What Muscles Do Skeletal muscles work in pairs to produce movement.

  43. Caring for Your Muscles Get regular exercise. Eat high protein foods to build muscle. Practice good posture to strengthen back muscles. Use proper equipment and wear appropriate clothing to protect muscles during any physical activity. Warm up properly and stretch before exercising, and cool down after exercising to prevent injury.

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