Human Anatomy Unit 2 MUSCULAR SYSTEM
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1 Human Anatomy Unit 2 MUSCULAR SYSTEM
2 In Anatomy Today
3 Functions Movements of bones and soft body parts Movements of fluids through a tube (blood, digestive)
4 Functions Maintain posture Support soft organs
5 Functions Control movement through a passage or opening Control body temperature
6 Muscle Fascia
7
8 Muscle Tissue Connective tissue layers are continuous with each other Tendon Periostium Epimysium Perimysium Endomysium
9 Fusiform Parallel Convergent Pennate Circular Fascicle Orientation 5 Muscle Types
10 Fusiform Muscles Thick in middle Tapered at ends Moderately strong contractions Examples: Biceps brachii Gastrocnemius
11 Parallel Muscles Straplike with parallel fascicles Uniform width Contract more than other muscle types Weaker than fusiform Examples: Rectus abdominis Sartorius
12 Pennate Muscles Feather-shaped Fascicle inserts into tendon running through muscle Unipennate Semimembranosus Bipennate Rectus femoris Multipennate Deltoid
13 Circular and Convergent Muscles Circular Sphincters Ex) Obicularis oris Convergent Fan shaped Narrow at insertion Strong Ex) Pectoralis major
14 Macrostructure of skeletal muscle Origins attachment of a muscle to a stationary bone Insertions attachment of a muscle to a movable bone
15 Characteristics of Origins and Insertions Indirect attachments (most common) Tendons cordlike structures of fibrous, regular connective tissue Aponeuroses a wide, thin, tendon Direct attachments the muscle surface is attached directly to the periosteum of bone
16 Naming Muscles By fiber arrangement Rectus Fascicles (fibers) run parallel to the muscle longitudinal midline axis (LMA) Example Rectus abdominis
17 Naming Muscles By fiber arrangement Transverse Fascicles are perpendicular to the LMA Transverse abdominis Transversus costarum Oblique Fascicles are at an angle different than parallel or perpendicular Internal/external oblique
18 Naming Muscles By location Relative location Tibialis anterior Vastus lateralis Serratus dorsalis Scalenius dorsalis Profundus a deep muscle Flexor digitorum profundus
19 Naming Muscles By size maximus minimus medius brevis longus magnus
20 Naming Muscles By the number of origins biceps triceps quadriceps
21 Naming Muscles By shape Deltoideus Triangular Attached at side Trapezius Quadrilateral 2 sides that are parallel Rhomboideus parallelogram
22 Naming Muscles By origin and insertion Sternocleidomastoid Sternohyoid
23 Naming Muscles By action flexor pollices longus (pollux = thumb) pronator teres (teres = round) extensor digitorum
24 Functional Groups of Muscles 1. Prime movers (agonists) 2. Synergists 3. Antagonists 4. Fixators
25 Prime Movers Muscle produces most of force during movement across a particular joint 11 types Flexor Abductor Extensor Adductor Levator Depressor Supinator Pronator Rotator Sphincter Tensor
26 Types of Muscle Fibers Classified based on the speed of contraction 1. Slow (Type I, SO) 2. Intermediate (Type IIA, FO: fast oxidative) 3. Fast (Type IIB, FG: fast glycolytic) Other characteristics Primary source of fuel Myoglobin content Diameter of fiber Blood supply Time to fatigue
27 Small diameter Fatigue resistant Slow Twitch Fibers Type I: SO Fibers Very good blood supply Myoglobin (red meat) Many mitochondria Take a long time to contract after stimulation Develop less tension Primarily aerobic metabolism Lipids, carbohydrates, amino acids
28 Intermediate Twitch Fibers Type IIA: FO Fibers Fast twitch Intermediate Diameter Fatigue resistance Blood supply Number of mitochondria Myoglobin content Tension Primarily aerobic metabolism Carbohydrates High [glycolytic enzymes] in sarcoplasm
29 Large diameter Fatigue quickly Poor blood supply Fast Twitch Fibers Type II, FG Fibers No myoglobin (white meat) Few mitochondria Generates a lot of tension (Force) Primarily anaerobic metabolism Creatine phosphate High [glycolytic enzymes] in sarcoplasm
30 Fiber Type Distribution
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