mechanics of-movement-i-joints
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Frolich, Human Anatomy, Mechanics of Movement
MECHANICS OF MOVEMENT
Tissues and Structures Involved Muscle Nerve Bone Cartilage
What are Tendons? Role of Joints Mechanics of Joints Making it all work
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Frolich, Human Anatomy, Mechanics of Movement
Nerve and Muscle--the Motor Unit Motor neurons review
Ventral horn spinal cord Ventral root to spinal nerve to
dorsal or ventral ramus Nerve is bundle mixed
neurons One motor neuron synapes
with several muscle cells Motor Unit is one motor
neuron plus the muscle cells it synapses
“Action potential”--controlled conduction of electrical messages in neurons and muscle by depolarization of cell membrane
Fig. 14.6, M&M
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Frolich, Human Anatomy, Mechanics of Movement
Neuro-Muscular Junction
Action potential in nerves triggers chemical release at synapse which triggers action potential in muscle
Fig. 14.5, M&M
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Frolich, Human Anatomy, Mechanics of Movement
See also photo in Fig. 10.2 from M&M to see capillaries around muscle cells
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Frolich, Human Anatomy, Mechanics of Movement
Bone and Cartilage
Bone as tissue Bones as structures
formed from bone, cartilage and other tissues
Location of cartilage in skeleton and relation to joints
Fig. 6.1, M&M
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Frolich, Human Anatomy, Mechanics of Movement
HOW MOVEMENT HAPPENS: Muscles Pull on Tendons to Move Bones at Connections called Joints or Articulations
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Frolich, Human Anatomy, Mechanics of Movement
Tendon Generally regular
connective tissue Musculo-skeletal
connections Muscle to bone Muscle to muscle Bone to bone
Fig. 4.15f, M&M
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Frolich, Human Anatomy, Mechanics of Movement
Tendons Tendons are structures that
connect bone to muscle and are made up of tendon tissue
Can have various shapes Typical is cord-like tendon of
biceps Sheeths are
common--”aponeuroses” e.g. acromiotrapezius origin from thoracic vertebral spines
Fig. 10.3, M&M
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Frolich, Human Anatomy, Mechanics of Movement
• Ligaments connect bone-to-bone or reinforce joints--they are made up of tendinous tissue as well
•E.g. knee ligaments
Ligaments
Fig. 9.12, M&M
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Frolich, Human Anatomy, Mechanics of Movement
Joints or Articulations
Connections between bonesUsually, but not always allow for
movementFormed from various connective tissues
Fibrous Cartilaginous Synovial (most complex--typical limb joints)
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Frolich, Human Anatomy, Mechanics of Movement
Fibrous joints Suture
Bones tightly bound by minimal fiber
Only found in skull Syndemoses
Bones connected by ligaments
E.g. tibiofibular ligament, interosseous membrane of radius/ulna
Gomphoses Peg in socket joint Only found in teeth/alveoli
Fig. 9.1 a, M&M
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Frolich, Human Anatomy, Mechanics of Movement
Fibrous joints Suture
Bones tightly bound by minimal fiber
Only found in skull
Syndemoses Bones connected
by ligaments E.g. tibiofibular
ligament, interosseous membrane of radius/ulna
Gomphoses Peg in socket joint Only found in teeth/alveoli Fig. 8.4, M&M
Fig. 9.1 b, M&M
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Frolich, Human Anatomy, Mechanics of Movement
Fibrous joints Suture
Bones tightly bound by minimal fiber
Only found in skull
Syndemoses Bones connected by
ligaments E.g. tibiofibular ligament,
interosseous membrane of radius/ulna
Gomphoses Peg in socket joint Only found in
teeth/alveoliFig. 9.1 c, M&M
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Frolich, Human Anatomy, Mechanics of Movement
Cartilaginous Joints Synchondrosis
Hyaline cartilage unites bones
Epiphyseal growth plates Costal cartilage-sternum
Symphyses Fibrocartilage unites bones Pubic symphysis Intervertebral disc
Fig. 9.2, M&M
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Frolich, Human Anatomy, Mechanics of Movement
Synovial JointsMost common joints in bodyMost mobile jointsHave
Articular surfaces on bone with hyaline cartilage
Completely enclosed joint capsule formed from ligamentous connective tissue
Synovial fluid within capsule lubricates joint Some have meniscus or articular disc(e.g.
knee, jaw joint)
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Frolich, Human Anatomy, Mechanics of Movement
Also see Fig. 9.3, M&M
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Frolich, Human Anatomy, Mechanics of Movement
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Frolich, Human Anatomy, Mechanics of Movement
Synovial Joint Shape Types
Plane joints--intercarpal joints Hinge joints--elbow,ankle, interj-phalangeal Pivot joints--radio-ulnar joint Condyloid joints (egg into oval)--metacarpo-
phalangeal Saddle joints--carpo-metacarpal joint of thumb Ball-and-socket--hip, shoulder
The type of joint, in part, determines the range and direction of movement
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Frolich, Human Anatomy, Mechanics of Movement
Fig. 9.9, M&M
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X-ray of hand affected by arthritis
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Artificial Hip Joint
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Arthritis Information
From American Physical Therapists Association (good preventative info)
Arthritis stats from CDC (leading cause of disability)
Health Info from NIAMS (National Institute of Arthritis, Musculoskeletal and Skin Diseases)