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Muscular System

Muscular system

how many muscles in the human body? there are more than 600 muscles in the human body
how much of body weight is muscle? muscles account for about 40% the body's weight
how were muscles named in early history and why was this a problem? what was the solution to this? early anatomists named the muscles they saw in their native languages. this caused, in 1895, a system of Latin names was developed
origin muscle attachment at the relatively stationary end
insertion muscle attachment at relatively mobile end
belly thicker middle portion of the muscle
tendon muscle to bone
ligament bone to bone
aponeuroisis a white, flattened tendinous expansion (sheath of tendon)
dissect separate muscles cleanly from adjacent muscles
transect cut a muscle in half (mid-belly)
synergist muscles that work together to cause movement
example of synergist? the risorius and zygomaticus major, both work together for smiling
antagonist muscles that work in opposition to eachother
example of antagonist biceps brachii and triceps brachii
fixator stabilizess joints as other movements go on
example of fixator your trapezius muscles around scapula stabilize or "fixing" shoulder while you pic up pen
what are four muscle shapes? circular, fusiform, convergent (triangular) and straight (parallel)
example of circular muscle? orbicularis oculi
example of fusiform muscle? biceps brachii
example of convergent (triangular) muscle? temporalis, or pectoralis major
example of straight (parallel) muscle? rectus abdominus
draw a circular muscle just draw successive circles on top of eachother like the orbicularis oculi
draw a fusiform muscle draw a bicep w thicker belly and scribbles in it
draw a convergent muscle fibers fans together to a point, point kind of continues, looks like a broom kinda
draw straight muscle draw parallel fibers, three groups with space for tendinous insertion
example of muscle naed for its location?/ brachialis (in the arm)
example of muscle named for its shape? teres minor (round)
example of muscle named for its origin and insertion? sternocleidomastoid (sternum--< clavicle --> masstoid process of temporal bone
example of muscle named for the number of heads? biceps brachii
trapezius extends the head & neck stabilizes, elevates, depresses and retracts the scapula
extends the head & neck stabilizes, elevates, depresses and retracts the scapula trapezius
draw the trapezius start at occipital, go to spine of scapula. continue midway thru vertebrae and all the way down to 3rd to last thoracic. fibers fan into scapula from above and belo
sternocleidomastoid contract both sides = head flexion contract one side: draws head down (and tilts it) to the side opposite of contracting muscle helps to rotate the head
contract both sides = head flexion contract one side: draws head down (and tilts it) to the side opposite of contracting muscle helps to rotate the head sternocleidomastoid
what are the two muscles moving the head? trapezius & sternocleidomastoid
what are the 5 muscles of the scalp? auricularis anterior, posterior, and superior, frontalis & occipitalis
auricularis anterior pull ear forward
pull ear forward auricularis anterior
auricularis posterior pull ear back
pull ear back auricularis posterior
auricularis superior pull ear up
pull ear up auricularis superior
Created by: kalmetina
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