Basic Concepts Flashcards
Coronal plane
divides the anterior and posterior
Sagittal plane
Divides the left from right side
Transverse plane
Divides superior from inferior
Palmer
anterior hand (palm)
Dorsal
posterior hand
Ipsilateral
same side as structure
Contralateral
opposite side of a structure
Axial skeletal system
Cranium, hyoid, vertebrae, ribs, sternum
Appendicular system
limbs and girdles
Periosteum
_Connective tissue covering the external bone surface _Tendons of muscles intermingle with this tissue to unite muscles to the bones
Suture joint
_Fibrous joint _Between bones of the skull
Syndesmosis
_Fibrous joint _Bones connected by a sheet of dense connective tissue
Gomphosis
_Fibrous joint _Tooth root joined by cartilage, no cavity present
Synchondrosis
_joined by hyaline cartilage _i.e. growth plates, costochondral junction
Symphysis
_joined by fibrocartilage _i.e. intervertebral discs, pubic symphysis
Synovial joints
_fluid-filled joint cavity _increases flexibility b/t hyaline covered articular surfaces
Diarthoses
Permitting free motion in a joint (all synovial joints)
Parts of a synovial joint
_Articular cartilage _Joint cavity _Articular capsule _Synovial fluid _Ligaments _Articular discs
Articular cartilage
Mainly hyaline cartilage on the ends of the bone heads
Joint cavity
Fluid filled space between articular surfaces
Articular capsule
Outer layer of fibrous tissue that is continuous with the periosteum of related bones/inner synovial membrane
Synovial fluid
Viscous fluid produced by synovial membranes
Extracapsular ligament
Ligament that supports the capsule
Intracapsular ligament
Ligament that supports the inside of the capsule
Articular discs
_Improve articular surface interactions _Absorb forces
Plane joint
_2 flat surfaces _grinding/sliding movements
Hinge joint
_Cylinder end fits into a trough end _Best for uniaxial movement
Pivot joint
_Cylinder end fits into a ring of bone with fibrous support tissue _Allows for rotation _Atlantoaxial joint
Condyloid joint
_ Egg shaped surface with concave surface _ Biaxial movements of flexion/extension & abduction/adduction
Saddle joint
_Saddle-shaped convex & concave surfaces _Biaxial movements
Ball and Socket joint
Sphere in a concave socket yielding multiaxial movement
Arterial anastomosis
Matrix of interconnected arteries that allow for continual blood flow when joint is in extreme positions
Hilton’s Law
Joint is innervated by the branch of nerves that innervates the muscle that moves that joint
Superficial fascia
_Deep to the dermis _Allows for freer movement of skin over deeper structures
Deep fascia
_Dense,connective tissue found deep to the superficial fascia _Intermuscular septa to compartmentalize similarly functioning/innervated muscle groups _Extensions form muscle bundles
Retinacula
Thickened deep fascia near joints that act as pulleys for tendons
Skeletal muscle
Voluntary, striated
Smooth muscle
Involuntary, non-striated
Cardiac muscle
Involuntary, branched/striated
Tendons
Connect muscle to bone
Tendon sheath
Serous membrane that encloses a tendon with synovial fluid on the inside to reduce friction
Aponeurosis
Wide, flattened tendinous sheet that forms attaching structure for various muscle groups
Agonist
Main muscle that produces movement
Antagonist
Muscle that opposes the primary mover to create smooth movement
Fixator
Isometrically contracts to stabilize the origin of the primary mover
Synergist
Assists the primary mover either by providing similar forces or adjusts the system to modify the action
Tributaries
Where veins join together
Afferent/Sensory NS
Bring info to the CNS (Afferent accesses CNS)
Efferent/motor
Takes info away from the CNS (Efferent exits CNS)