Muscle System Extras

Question 1

Muscles may be named
based on the
direction of their
fibers

Answer 1

▫ Rectus means
straight.
▫ Oblique means
diagonal.

Question 2

Muscles may be named
based on their
relative size within
a group
.

Answer 2

▫ Longus and maximus
muscles are larger.
▫ Brevis and minimus
muscles are smaller.

Question 3

Muscles may be named
based on their
relative location to
other muscles

Answer 3

▫ Medial muscles are
towards the
midline.
▫ Lateral muscles
are towards the
sides.

Question 4

Muscles may be named
based on their
number of attachment
sites.

Answer 4

▫ Bi- means two.
▫ Tri- means three.

Question 5

Muscles may be named
based on their
origin and
insertion

Answer 5

▫ The origin is the
immovable bone the
muscle is attached
to.
▫ The insertion is
the movable bone.

Question 6

Muscles may be named
based on their
shape

Answer 6

▫ Delta (triangle)
▫ Trapezoid
▫ Serrated
(saw-toothed)
▫ Orbit (circular)

Question 7

Muscles may be named
based on their
action

Answer 7

▫ Flex means to bend
a joint.
▫ Extend means to
straighten a joint.

Question 8

Muscles may be named
based on their
action

Answer 8

▫ Abductors move an
appendage away
from the body.
▫ Adductors move an
appendage closer
to the body.

Question 9

frontalis

Answer 9

raises the
eyebrows.

Question 10

orbicularis
oculi

Answer 10

close the
eyelids.

Question 11

temporalis and
masseter

Answer 11

move the
mandible

Question 12

zygomaticus

Answer 12

the smiling
muscle.

Question 13

orbicularis
oris

Answer 13

closes the
lips

Question 14

sternocleidomastoid

Answer 14

rotates and flexes
the head.

Question 15

deltoid

Answer 15

abducts the arm.

Question 16

pectoralis
major

Answer 16

adducts the
arm

Question 17

external
abdominal obliques

Answer 17

rotate, flex, and
compress the
trunk

Question 18

rectus abdominis

Answer 18

flexes and compresses
the trunk.
▫ Under the rectus
sheath

Question 19

internal abdominal
obliques

Answer 19

rotate and
flexes the trunk