Developmental Aspects of Muscular System by mikeholy

VIEWS: 39 PAGES: 12

									 Developmental
   Aspects of
Muscular System
                  Development

   Embryo
       Muscular system laid down in
        segments
       Each segment is invaded by
        nerves


   First movements of fetus
       Occur by 16th week of
        pregnancy
         Muscle Development
   Once born, a baby’s movements are all
    gross reflex types of movements
       Nervous system must mature
       Control proceeds in cephalic/caudal
        direction, and gross muscular movements
        precede fine ones

    Ex: babies can raise head before they sit up;
    Wave ‘bye’ before grasping blocks
             Healthy Muscles
   Rich blood supply
   Resistant to infection
   Good nutrition
   Regular exercise
       If not, then atrophy
                 Aging
   As we age, amount of connective tissue
    increases
   Amount of muscle tissue decreases

                So what?

   Body weight declines
   Decrease in muscle strength
Muscle Problem Examples

   Muscular dystrophy
   Myasthenia gravis
   Torticollus
         Muscular dystrophy
   A group of genetic
    muscle diseases that
    cause progressive
    muscle weakness
   Muscles enlarge due
    to fat and connective
    tissue deposit
   Muscle fibers
    degenerate
Duchenne MD
   Mostly in boys (X-linked
    recessive)
   Diagnosed between 2-7
    years old
   Active, normal children
    appear clumsy
   Disease progresses from
    extremities upward
   Usually results in death
    due to respiratory
    distress
             Myasthenia gravis
   Symptoms include:
       Drooping of upper eyelids
       Difficulty swallowing and
        talking
       Muscle fatigue and
        weakness
   Shortage of Acetylcholine
    receptors at
    neuromuscular junctions
   Muscles not stimulated
    properly
   Death usually occurs due
    to respiratory failure
                 Torticollis
   ‘Wry neck’
   In difficult births,
    one of
    sternocleidomastoid
    muscles may be
    injured
   Muscles contract
    involuntarily
   Cause head to turn
            Topics in Muscles
   You and a partner will be assigned a muscle disease
    or disorder.
   Research the topic.
   Outline 5 major/interesting findings (including cause,
    symptoms & treatment) as they pertain to our study
    of the muscular system. Try to include any recent
    breakthroughs.
   Present information (informally as roundtable) to the
    class about your topic.
   Hand in the outline with at least 5 findings and
    sources.
Topics in Muscles
     1.    Dermatomyositis
     2.    Compartment Syndrome
     3.    Rhabdomyolysis
     4.    Myopathy
     5.    Diastasis Recti
     6.    Zenker’s Degeneration
     7.    Pelvic Floor Muscle Disorder
     8.    Fibromyalgia
     9.    Tetanus
     10.   Botulism
     11.   Orofacial Myology Disorders

								
To top