Kin 2500 Muscles
KIN 2500 -- MUSCLES
O: origin
I: insertion
A: action
N:
Lever: rigid structure that moves around a fixed point fulcrum * Effort: causes the movement; force that is due to the muscular contraction; you only get motion when the effort that is applied at the insertion point exceeds the load * Load/Resistance: opposes that movement * 1st class levers: not very common; fulcrum is fixed between effort and load * 2nd class levers: standing on tip toes; fairly uncommon; the load is between the fulcrum and the effort * 3rd class levers: most common; effort is between the fulcrum and the load; i.e. flexor of our elbow
Anatomical Position:
On legs: flexor on posterior; extensor on anterior
Movement is the result of many muscles
Opposing Actions the prime mover/agonist is going to be responsible for the action while the other muscle is the antagonist * Supinator: prime mover/ agonist * Pronator: opposing/ antagonist
Synergist: stabilizes intermediate joints
Fixator: stabilizes the origin of the agonist so this agonist can work more efficiently
Characteristics that are used to name muscles: 1. Direction of muscle fibers a. Rectus: run parallel to the midline b. Transverse: runs transversely c. Oblique: run at an angle 2. Size of the muscle d. Maximus: largest e. Minimus: smallest f. Longus: longest g. Brevis: shortest h. Longissimus: widest i. Magnus: large j. Major: k. Minor: l. Vastus: great 3. Shape of the muscle m. Deltoid: triangle n. Trapezius: trapezoid o. Seratus: saw tooth p. Rhomboidous: diamond shaped q. Orbicularis: Circle r. Pectinate: Cone s. Puriformous: pear shaped t. Platous: flat u. Bigradous: square v. Briscillous: slender 4. Action of the muscle: w. Flexor/extensor x. Abduction/adduction y. Levator: elevates z.
O: origin
I: insertion
A: action
N:
Lever: rigid structure that moves around a fixed point fulcrum * Effort: causes the movement; force that is due to the muscular contraction; you only get motion when the effort that is applied at the insertion point exceeds the load * Load/Resistance: opposes that movement * 1st class levers: not very common; fulcrum is fixed between effort and load * 2nd class levers: standing on tip toes; fairly uncommon; the load is between the fulcrum and the effort * 3rd class levers: most common; effort is between the fulcrum and the load; i.e. flexor of our elbow
Anatomical Position:
On legs: flexor on posterior; extensor on anterior
Movement is the result of many muscles
Opposing Actions the prime mover/agonist is going to be responsible for the action while the other muscle is the antagonist * Supinator: prime mover/ agonist * Pronator: opposing/ antagonist
Synergist: stabilizes intermediate joints
Fixator: stabilizes the origin of the agonist so this agonist can work more efficiently
Characteristics that are used to name muscles: 1. Direction of muscle fibers a. Rectus: run parallel to the midline b. Transverse: runs transversely c. Oblique: run at an angle 2. Size of the muscle d. Maximus: largest e. Minimus: smallest f. Longus: longest g. Brevis: shortest h. Longissimus: widest i. Magnus: large j. Major: k. Minor: l. Vastus: great 3. Shape of the muscle m. Deltoid: triangle n. Trapezius: trapezoid o. Seratus: saw tooth p. Rhomboidous: diamond shaped q. Orbicularis: Circle r. Pectinate: Cone s. Puriformous: pear shaped t. Platous: flat u. Bigradous: square v. Briscillous: slender 4. Action of the muscle: w. Flexor/extensor x. Abduction/adduction y. Levator: elevates z.