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LeonardcrainSkeletal system/tissues, joints and skeletal muscle (Skeletal…
LeonardcrainSkeletal system/tissues, joints and skeletal muscle
Skeletal System/Tissues
Major Functions
Support
Movement
Protection
Mineral Storage
Blood cell formation
Energy Storage
Major Structural components
Bones - cells & Extracellular Matrix
Ligaments
Tendons
Articulation
Cartilage
35% organic & 65%inorganic
compact bone and spongy bone characteristics/features
Compact bones - Outer part of every bone / Osteons and compact bone
Spongy Bone - end of long bones and inside all other bones - No Osteons - made up of Trabecular - Osteocyte - E.C Matrix
components of a long bone
Epiphyses
Epiphysis Distal
Endosteum
Medullary Cavity
Periosteam
Epiphyseal Line
red and yellow bone marrow
Red Bone Marrow - gelatinous material
Yellow Bone marrow - fatty, nutrient storage
types of bone cells
Osteogenic Cells - stem cells
Osteoblast
Osteacytes
Osteoblast - created from Leukocytes
joints
Fibrous joints
Suture
Syndesmosis
Gomphosis
Cartilaginous Joints
Synchondrosis
Symphysis
Synovial Joint - presence of joint cavity surrounded by a joint capsule
six structural types of synovial joints
Plane Joint
Hinge Joint
Pivot Joint
Condylar Joint
Saddle Joint
Ball-and-socket joint
skeletal muscle
Functions
Muscles of all type produce heat
Open & Closes passage ways - sphincter muscle
Maintain Posture + Stabilize joints
Generate Heat
Properties - C.E.E.E
Contractility - generating tension
Excitability - ability to respond to a stimulus
Extensibility - ability to stretch
Elasticity - ability to return to original shape after contraction/extension
Connective Tissue Layers
Perimysium - covers each fascicle
Epimysium - D.I.C.T - Binds fascicles together
Deep Fascia - Binds whole muscles together
Endomysium - composed of mostly reticular fibers
Components of Skeletal Fibers
Sarcolemma - Plasma membrane of the muscle
Myofibril - muscle fibers
Transverse Tubules (T - Tubules)
Sarcoplasmic Reticulum - smooth endoplasmic reticulum - storage of calcium
Terminal Cistern - Storage place for calcium