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Muscular System
Muscular system
| Question | Answer |
|---|---|
| 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 confusion.so, 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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