Chapter 9. The Muscular System
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1 1
2 Chapter 9 The Muscular System 2
3 Introduction Skeletal muscles: movement in environment Smooth muscles: intestines, ureters, veins and arteries Cardiac muscle: pumps blood through heart and blood vessels 40 50% of body weight 3
4 The Types of Muscle 4
5 The Types of Muscle (cont d.) Skeletal: voluntary, striated, and multinucleated Smooth: involuntary, nonstriated, and uninucleated Cardiac: involuntary, striated, and uninucleated 5
6 The Anatomy of Skeletal or Striated Muscle 6
7 The Anatomy of Skeletal or Striated Muscle (cont d.) Skeletal muscle cell surrounded by sarcolemma Fasciculi: bundles of fascicles Fascicles: individual bundles of muscle fibers 7
8 The Anatomy of Skeletal or Striated Muscle (cont d.) Perimysium: surrounds each fascicle Epimysium: covers the perimysium Fascia: covers the epimysium Myosin: A bands Actin: I bands Z lines H zone 8
9 The Anatomy of Skeletal or Striated Muscle (cont d.) Sarcomere: between two adjacent Z lines Actual contraction process occurs here Sarcotubular system T system and sarcoplasmic reticulum 9
10 The Physiology of Muscle Contraction 10
11 Introduction Motor unit: all muscle cells innervated by one motor neuron Muscle cell properties Excitability Conductivity Contractility Elasticity 11
12 Neuroelectrical Factors Na + higher concentration outside muscle cell K + higher concentration inside muscle cell Resting potential: charge outside positive and inside negative Electrical potential: rush of Na + inside cell K + moves outside cell attempting to balance 12
13 Neuroelectrical Factors (cont d.) 13
14 Neuroelectrical Factors (cont d.) Action potential Calcium released Troponin and tropomyosin action inhibited Activated myosin links to actin filaments 14
15 Chemical Interactions Myosin heads contain ATP ATP releases energy upon myosin/action link Energy released used to pull action Sodium: potassium pump pumps out sodium Resting potential restored 15
16 Chemical Interactions 16
17 Energy Sources ATP: energy source for muscle contraction ATP production Glycolysis Krebs citric acid cycle Electron transport Alternate sources: fatty acids and phosphocreatine 17
18 The Muscle Twitch 18
19 The Muscle Twitch (cont d.) Stimulus > latent period > contraction > relaxation Contraction strength depends on Strength, speed, and duration of stimulus Weight of load Temperature All-or-none law 19
20 The Muscle Twitch (cont d.) 20
21 Muscle Tone 21
22 Muscle Tone (cont d.) State of partial contraction throughout whole muscle Maintains pressure on abdominal contents Helps maintain blood pressure Aids digestion Types Isotonic, isometric 22
23 The Anatomy of Smooth Muscle 23
24 The Anatomy of Smooth Muscle (cont d.) Found in hollow structures Involuntary, uninucleated, nonstriated Arrangement (two layers) Longitudinal (outer) Circular (inner) 24
25 The Anatomy of Cardiac Muscle 25
26 The Anatomy of Cardiac Muscle (cont d.) Autonomic nervous system control Involuntary, uninucleated, striated Intercalated disks: coordinate contraction Cardiac muscles: contract, relax, and contract 75 times/minute 26
27 The Naming and Actions of Skeletal Muscles 27
28 Action Shape The Naming and Actions of Skeletal Muscles (cont d.) Origin and insertion Location Direction of fibers 28
29 The Naming and Actions of Skeletal Muscles (cont d.) Origin: more fixed attachment of muscle Insertion: movable attachment of muscle Tendons: attach muscle to bone Aponeurosis: wide flat tendon 29
30 The Naming and Actions of Skeletal Muscles (cont d.) Flexors: bend limb at a joint Extensor: straighten limb at a joint Abductors: move limb away from midline Adductors: bring limb toward midline Rotators: revolve limb around axis 30
31 The Naming and Actions of Skeletal Muscles (cont d.) Dorsiflexors: raise the foot Plantar flexors: lower the foot Supinators: turn palm upward Pronators: turn palm downward 31
32 The Naming and Actions of Skeletal Muscles (cont d.) Levators: raise a part of the body Depressors: lower a part of the body Prime movers or agonists: bring about an action Antagonists: oppose agonists Synergists: assist prime movers 32
33 The Function and Location of Selected Skeletal Muscles 33
34 Superficial Muscles Superficial muscles of the body, anterior view 34
35 Superficial Muscles (cont d.) Superficial muscles of the body, posterior view 35
36 Muscles of Facial Expression Occipitalis Frontalis Zygomaticus Levator labii superioris Orbicularis oris and buccinator 36
37 Muscles of Facial Expression (cont d.) Some muscles of the head and neck, anterior view 37
38 Muscles of Facial Expression (cont d.) Some muscles of the head and neck, lateral view 38
39 Muscles of Mastication Masseter Temporalis Pterygoid 39
40 Muscles of the Eye Superior rectus Inferior rectus Medial rectus Lateral rectus Superior and inferior oblique 40
41 Muscles Moving the Head Sternocleidomastoid Contraction of both causes flexion of neck Contraction of one causes rotation to left or right 41
42 Muscles Moving the Head 42
43 Muscles Moving the Shoulder Girdle Levator scapulae Rhomboids Pectoralis minor Trapezius Serratus anterior 43
44 Muscles Moving the Humerus Pectoralis major Latissimus dorsi Teres minor Deltoid Supraspinatus Infraspinatus 44
45 Muscles Moving the Humerus 45
46 Muscles Moving the Elbow Brachialis Biceps brachii Brachioradialis Triceps brachii Anconeus 46
47 Muscles Moving the Wrist Flexor carpi Extensor carpi 47
48 Muscles Moving the Hand Supinator Pronator teres Pronator quadratus 48
49 Muscles Moving the Thumb Flexor pollicis Extensor pollicis Adductor pollicis Abductor pollicis Opponens pollicis 49
50 Muscles Moving the Fingers Flexor digitorum Extensor digitorum Interossei 50
51 Muscles of the Abdominal Wall External oblique Internal oblique Transversus abdominis Rectus abdominis 51
52 Muscles of the Abdominal Wall (cont d.) 52
53 Muscles of Respiration or Breathing Diaphragm Main muscle External and internal intercostals Expand the ribs 53
54 Muscles Moving the Femur Psoas Iliacus Gluteus maximus Gluteus medius Gluteus minimus Tensor fascia lata 54
55 Muscles Moving the Knee Joint Biceps femoris Semitendinosus Semimembranosus Popliteus Gracilis Sartorius Quadriceps femoris 55
56 Muscles Moving the Knee Joint 56
57 Muscles Moving the Foot Gastrocnemius Tibialis posterior Soleus Peroneus longus Plantaris Tibialis anterior Peroneus tertius 57
58 Muscles Moving the Toes Flexor hallucis Extensor hallucis Flexor digitorum Extensor digitorum Abductor hallucis Abductor digiti minimi 58
59 Summary Described the gross and microscopic anatomy of skeletal muscle Contrasted skeletal, smooth, and cardiac muscle anatomy Described muscle contraction and the role of neuroelectrical and chemical factors and energy sources Named major muscles of the body 59
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