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muscles of the head and neck occipitofrontalis, orbicularis oculi, orbicularis oris, buccinator, zygomaticus, levator labii superioris, depressor anguli oris.
occipitofrontalis raises the eyebrows
orbicularis oculi closes the eyelids and causes "crows feet' wrinkles in the skin at the ateral corners of the eye
orbicularis oris pucker the lips
buccinator flattens the cheeks. trumpeter's muscle
zygomaticus, smiling muscle
levator labii superioris sneering
depressor anguli oris frowning
mastication chewing
______ pairs of masication muscles 2 pair of pterygoids, temporalis, and masseter
intrinsic tongue muscles change the shape of the tongue
extrinsic tongue muscles move the tongue
sternocleidomastoid lateral neck muscle and prime mover, rotates and abducts the head
erector spinae group of muscles on each side of the back, responsible for keeping the back straight and the body erect.
thoracic muscles muscles that move the thorax
external intercostals elevate the ribs during inspiration
internal intercostals contracts during forced expiration
diaphragm accomplishes quiet breathing, dome shaped muscle, also aids breathing
linea alba the tendinous area of the abdominal wall, consists of white connective tissue rather than muscle
upper limb has 14 parts
trapezius rotates scapula
serratus anterior pulls scapula anteriorly
buttocks gluteous maximus
muscle cells muscle fibers
chest muscles pectoral muscle
anterior thigh muscle quadriceps femoris
posterior thigh muscle hamstrings
back muscles latissimus dorsi
adenosine triphosphate ATP
excitability the ability for the muscle to recoil to its original length
contractility ability for the muscle to contract
elasticity the ability for the muscle to recoil to its original length
extendibility the ability or the muscle to extend
epimysium the connective tissue sheath that is directly upon the whole muscle
serratus anterior pulls scapula
pectoralis major adducts and flexes the arm
triceps brachii extends the forearm
biceps brachii flexes the forearm
brachialis flexes forearm
brachialis flexes forearm
retinaculum also known as bracelet
flexor carpi flexes the wrist
extensor carpi extends the wrist
flexor digitorum flexes the fingers
extensor digitorum extends he fingers
quaddriceps femoris extends the leg
sartoris flexes the thigh
sartoris also known as tailors muscle
hamstring muscle flexes the leg
hamstring muscle posterior to thigh
gastrocnemius and soleus forms calf muscle
gastronemius and soleus they join the calcaneal
foot 20 muscles
intrinsic foot muscles extends, abduct, and adduct the toes
muscle twitch a contraction of an entire muscle in response to a stimulus
threshold a muscle fiber will not respond to stimulus until that stimulus reaches a level.
all or none response at the point that the muscle fiber will contract maximally
lag phase the time between application of a stimulus to a motor neuron and the beginning of a contraction
contraction phase the time of contraction
relaxation phase the time during which the muscles rest
tetany the muscle remains contracted without relaxing
recruitment increase in number of motor units being activated
atp produced in the mitochondria
atp is short lived and unstable
creatine phosphate at rest muscles cant stockpile ATP but they can store another high energy molecule
oxygen debt the amount of oxygen to pay back the oxygen debt
isometric the length of the muscle does not change
isometric the amount of tension increases during contraction
isotonic means equal tension
isotonic the amount of tension produced
muscle tone constant tension produced by muscles
fast twitch fibers contracts quickly
slow twitch fibers contracts quickly
origin the most stationary end of muscle
insertion the end of the muscle undergoing the greats movement
belly the portion of the muscle between the origin and insertion
synergists muscles that work together to accomplish specific movements
antagonists muscles that work in opposition to one another
prime over one muscle plays the major role in accomplishing the desired movement
Created by: abberry2