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Muscle Extensions

Occipitofrontalis raise the eyebrows
Orbicularis oculi closes the eyelids and causes “crows feet” wrinkles in the skin at the lateral corners of the eye.
Orbicularis oris puckers the lips.
Buccinator flattens the cheeks. Trumpeter’s muscle.
Zygomaticus smiling muscle.
Levator labii superioris sneering
Depressor anguli oris frowning
Mastication chewing
Sternocleidomastoid rotates and abducts head
Erector spinae muscles on each side of back keeping it straight
Diaphragm accomplishes quiet breathing
External intercostals elevate the ribs during inspiration
Internal intercostals contract during forced expiration
Intrinsic Tongue Muscles changes the shape of the tonuge
Extrinsic Tongue Muscles move the tongue
Dome shaped muscle aiding breathing
Trapezius rotates scapula
Serratus anterior pulls scapula anteriorly
Pectoralis major adducts and flexes the muscle
Latissimus dorsi powerfully extends the arm
Deltoid major abductor of the upper limb
Triceps brachii extends the forearm
Biceps brachii flexes the forearm (anterior compartment)
Brachialis flexes forearm
Brachioradialis flexes and supinates the forearm
Flexor carpi flexes the wrist
extensor carpi extends the wrists
flexor digitorum flexes the fingers
extensor digitorum extends the fingers
Gluteus maximus buttocks
Quadriceps femoris extends the leg
Sartorius tailors muscle. flexes the thigh
Hamstring muscles posterior thigh muscles; flexes the leg and extends the thigh
Gastrocnemius and soleus form the calf muscle.
intrinsic foot muscles 20 muscles located within the foot
peroneus muscles the laternal muscles of the leg
Contractility skeletal muscle to shorten with force
Excitability skeletal muscle to respond to a stimulus.
Extensibility ability to be stretched.
Elasticity recoil to their original resting
epimysium surrounds skeletal muscle
Fascia connective tissue outside the epimysium
perimysium. loose connective tissue
endomysium. surrounds each muscle fiber
myofibrils cytoplasm of each fiber
actin myofilaments thin myofilaments
myosin myofilaments thick myofilaments
sarcomeres basic structural and functional unit of the muscle.
resting membrane potential. charged difference between cell membranes
action potential. brief reversal back of the
Motor neurons nerve cells that carry action potentials to skeletal muscle fibers.
neuromusclular junction or synapse branch that connects to the muscle forms
motor unit single motor neuron and all the skeletal muscle fibers it innervates
presynaptic terminal enlarged nerve terminal
postsynaptic terminal. the space between the presynaptic terminal and the muscle cell
synaptic vesicles presynaptic terminal contains this
acetylcholine. this secrete a neurotransmitter
acetylcholinesterase. enzymes that rapidly break down acetylcholine
sliding filament mechanism sliding of actin myofilaments past myosin myofilaments during contraction
Muscle twitch contraction of an entire muscle
threshold point the muscle fiber will contract maximally
lag phase. time between application of a stimulus and beginning of a contraction
contraction phase time of contraction
relaxation phase time of relaxation
Tetany when muscle remains contracted
recruitment increase in number of motor units
creatine phosphate. high energy molecule
Anaerobic respiration without oxygen
Aerobic respiration with oxygen
oxygen debt amount of oxygen needed to convert lactic to glucose
Muscle fatigue results when ATP is used
isometric the length of the muscle does not change, but the amount of tension increases during the contraction process.
isotonic the amount of tension produced by the muscle is constant during contraction, but the length of the muscle changes.
muscle tone constant tension produced by muscles
Fast-twitch fibers contract quickly and fatigue quickly
13. Slow-twitch fibers contract more slowly and release slowly
origin stationary end of muscle
Created by: karleetackett



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