Naming Muscles Muscles causing movement n Skeletal Muscle
- Slides: 44
Naming Muscles
Muscles causing movement… n Skeletal Muscle – an organ made of several different types of tissue including muscle tissue, vascular tissue and nervous tissue
n Tendon – attaches the skeletal muscle to bone and pulls on bone when the muscle contracts
Joints n Skeletal muscles usually cross one or more joints. When a muscle contracts it pulls one bone closer to another n One bone stays in place while the other moves
Parts of a skeletal muscle n n n Origin – the attachment of a muscle on a stationary bone Insertion – the attachment of a muscle on the movable bone Belly – the fleshy portion of muscle between the origin and insertion
Group Actions n Most movements occur because groups of muscles work together, generally grouped in opposing pairs Ex – abductors and adductors n Ex – extensors and flexors n
n n Agonist – muscle that produces the desired movement Antagonist – muscle that relaxes when the agonist contracts Synergists – another skeletal muscle that moves in the same general direction as the agonist increasing the force Fixators – stabilize the origin and hold other joints still so the agonist can work more efficiently
Principle Skeletal Muscles n With over 700 skeletal muscles in the body, it will be easier to first learn the naming system and then learn specific muscles region by region
Naming Skeletal Muscles n Muscles are named according to the direction the fibers run, the size of the muscle, the shape of the muscle, the action the muscle produces, the number of origins the muscle has and/or the location of the muscle
Directions n The following terms refer to the direction the muscle fibers run in relation to the midline.
Rectus n Parallel to the midline
Transverse n Perpendicular to the midline
Oblique n Diagonal to the midline
Size n Relative to other muscles in that group
Maximus n Largest
Minimus n Smallest
Longus or Longissimus n Longest
Latissimus n Widest
Magnus n Large
Major n Larger
Minor n smaller
Vastus n great
Shape n General shape of the muscle
Deltoid n Triangle
Trapezius n Trapezoid
Serratus n Saw-toothed
Rhomboid n Diamond Shaped
Orbicularis n Circular
Pectinate n Comb-like
Piriformis n Pear shaped
Platys n Flat
Quadratus n square
Gracilis n slender
Action n Based on the action the muscle performs
Flexor/Extensor n n Flexor – decreases the angle between bones Extensor – increases the angle between bones
Abductor/Adductor n n Abductor – moves a bone away from the midline Adductor – moves a bone toward the midline
Levator/Depressor n n Levator – elevates body part Depressor – lowers body part
Supinator/Pronator n n Supinator – turns palms up Pronator – turns palms down
Sphincter n Decreases the size of an opening
Tensor n Makes a body part rigid
Number of Origins n Biceps – 2 heads n Triceps – 3 heads n Quadriceps – 4 heads
Location n Muscles named for the structures that they are by. Examples include the sternocleidomastoid muscle (runs from the sternum across the clavicle to the mastoid process) and the temporalis (near the temporal bone)
- Platys muscle shape
- Naming skeletal muscles
- How are muscles named
- Muscles of the leg
- Gap junction in smooth muscle
- Grade 3 forces causing movement
- Skeletal muscle belly
- Centrally acting skeletal muscle relaxants
- Skeletal muscle cylindrical
- Components of lymphatic system
- Cardiac muscle cross section
- Function of skeletal muscle
- Muscle diagram
- Function of skeletal muscle
- Skeletal muscle crash course
- Cross bridge muscle
- Microscopic anatomy of skeletal muscle figure 6-2
- Figure 10-1 skeletal muscle fiber
- Macro structure of muscle
- Filament bending
- Skeletal muscle tissue structure
- Starter which muscles do you already know
- Skeletal muscle
- Comparison of skeletal cardiac and smooth muscle
- Dantrolene
- Skeletal muscle
- Hierarchy of muscle organization
- Pseudostratified vs simple columnar
- Function of muscle
- Microscopic anatomy of skeletal muscle
- Is skeletal muscle an organ
- Comparison of skeletal cardiac and smooth muscle
- Lesson 5.1 the organization of a skeletal muscle
- Contractile unit of muscle
- Layers of the pharynx
- Skeletal muscle organization
- Skeletal muscle tissue
- Transitional epithelium
- Skeletal muscle tissue 40x
- Non depolarizing muscle relaxant classification
- Comparison of skeletal cardiac and smooth muscle
- Label the superficial muscles
- Skeletal muscle origin
- 5 functions of skeletal muscle
- Skeletal muscle