Chapter 4 Flashcards
bi
twice, double, two
cele
hernia, tumor, swelling
dys
bad, difficult, painful
fasci/o
fascia
fibrous band
fibr/o/
fibrous tissue
fiber
ia
abnormal condition
disease
ic
pertaining to
kines or kinesi
movement
myo
muscle
plegia
paralysis or stroke
rrhexis
rupture
taxo
coordination or order
teno tendo tendino
tendon
stretch out
extend
strain
tono
tone
stretching
tension
tri
three
5 Functions of Muscular System
- hold the body erect and make movement possible
- generate 85% of heat that keeps body warm
- move food through digestive system
- muscle movement aids flow of blood through veins as it returns to the heart
- muscle action moves fluid through ducts and tubes associated with other body systems
musculoskeletal system
refers to the muscular and skeletal system
provide body with form, support, stability, and ability to move
Describe statistics of the muscular system
greater than 600 musclels
40-45% of body weight
Briefly describe skeletal muscle
Are composed of fibers that are covered with fascia
Attached to bone by tendons
Muscle Fiber
long, slender cells that compose muscles
each muscle consists of a group of fibers bound together by connective tissue
Fascia
band of connective tissue that envelops, separates or binds together muscle or groups of muscles
is flexible to allow muscle movement
Tendon
narrow band of nonelastic, dense, fibrous connective tissue that attaches muscle to bone
Ligaments
bands of fibrous tissue that form joints by connecting bone to bone
Patellar Tendon
attach muscle to bottom of patella (kneecap)
Achilles Tendon
attach gastrocnemius muscle (major muscle of calf of leg) to heel bone
Aponeurosis
sheet-like fibrous connective tissue resembling flattened tendon connecting muscles together OR to a bone.
e.g. abdominal aponeurosis
Types of muscle
skeletal
smooth
myocardial
Skeletal Muscle
attach to the bone of skeletal
make body movement possible
a. k.a voluntary muscle because we have conscious or voluntary control over the muscle
a. k.a striated muscle because the dark and light bands in the muscle fibers create a striped appearance
striated
striped
Where are smooth muscles located?
walls of internal organs (digestive tract, blood vessel, duct leading from gland)
The function of smooth muscle
to move and control the flow of fluid through internal organs
What are smooth muscles also known as?
involuntary muscle
= under control of ANS and are not voluntary
unstriated muscle
= do not have dark and light bands that produce striped appearance
visceral muscle
= found in hollow structure (digestive and urinary system)
= are found in large internal organs (except the heart)
visceral
pertaining to the interior
Myocardial muscle
a.k.a myocardium or cardiac muscle
form muscular wall of the heart
looks like striated skeletal muscle but is involuntary (like smooth muscle)
its contact contraction and relaxation causes a heartbeat
why are muscle movements possible (3)
- specialized muscle type
- muscle innervation
- organization of muscle into antagonistic muscle pairs
Muscle Innervation
stimulation of a muscle by an impulse transmitted by a motor nere
Motor Nere
enable brain to stimulate a muscle to contract
when stimulation stops, muscle relaxes
control body’s voluntary muscular contractions
Nerve impulse interruption
- disrupted due to an injury or disease
- muscle will be unable to function properly
- may cause paralysis or unable to contact properly
Neuromuscular
the relationship between a nerve and a muscle
Antagonistic
working in opposition to each other
Antagonistic Muscle Pairs
Muscles in each pair are made up of specialized cells that can change length or shape by contracting or relaxing
contraction
tightening of a muscle
causes muscle to become shorter and thicker, and the belly or center of the muscle enlargeds
relaxation
muscle returns to original form
becomes longer and thinner, and belly is no longer enlarged
Abduction
movement of a limb away from the midline of the body
limb moves outward and away from side of body
Abductor
muscle that moves body part away from midline
Adduction
movement of limb toward midline of the body
limb moves inward toward side of body
Adductor
muscle that moves body part toward the midline
Ion
action
ab
away from
ad
toward
duct
to lead
Flexion
decrease angle between two bones by bending a limb at a joint
knee or elbow is bent
Flexor muscle
bends limb at a joint
flex
to bend
extension
increase angle between two bones or straightening out a limb
knee or elbow is straightened
ex
away from
tens
stretch out
Extensor muscle
straighten limb at joint
hyperextension
extreme or overextension of a limb or body part beyond normal limit
e.g. movement of head far backward or far forward causes hyperextension of neck muscles
Elevation
raising or lifting body part
e.g. elevation of levator anguli oris muscles of face raise corner of mouth into smile
levator
muscle that raises body part
Depression
act of lowering a body part
e.g. depressor anguli oris lowers corner of mouth into frown
depressor
muscle that lowers body part
rotation
circular movement around an axis such as a shoulder joint
turns bone on own axis
axis
imaginary line that runs lengthwise through center of the body
Circumduction
circular movement at the far end of the limb
e.g. swinging motion of the far end of the arm
rotator muscle
turn body part on axis
the humerus
= the head of the humerus rotates within the shoulder joint
rotator cuff
group of muscles and their tendons that hold the head of the humerus securely in place as it rotates within the shoulder joint
supination
act of rotating arm or leg so that the palm of the hand or sole of the foot is turned forward or upward
pronation
act of rotating the arm or legs so that the palm of the hand or the sole of the foot is turned downward or backward
dorsiflexion
movement that bends the foot upward at the ankle
decreased angle between top of foot and front of leg
plantar flexion
movement that bends the foot downward at the ankle
increase angle between top of foot and front of leg
plantar
pertaining to sole of the foot
superficial muscle
named because they are located near the surface, just under the skin
How are muscles named (7)
origin and insertion
action
location
fiber direction
number of divisions
size or shape
strange reasons
origin
one point of attachment
where muscle begins
located nearest the midline of the body or on a less movable part of the skeleton
less movable attachment
insertion
point of attachment
where muscle ends by attaching to a bone or tendon
more movable attachment
farthest point from midline of the body
sternocleidomastoid muscle
bend the neck and rotate the head
origin = stern/o or breastbone AND cleid/o or collar bone insertion = mastoid process
mastoid process
part of temporal bone located just behind ear
mastoid muscle
inserts at one point of insertion into mastoid process
Muscles named for action
flexor carpi muscle
extensor carpi muscle
allow for bending and straightening of the wrist
carpi
wrist or wrist bone
Muscles named for location
pectoralis major
lateralis
medialis
pectoralis major
thick and fan-shaped muscle on the anterior chest wall
pectoral
relating to chest
lateralis
toward the side
vastus lateralis
large muscle toward outer side of the leg
vastus
huge
medialis
toward the medline
vastus medialis
muscle toward midline of the leg
part of quadriceps that flex and extend at the knee
Muscles named for fiber direction
external oblique and internal oblique muscles
= are at slanted alignment
rectus abdominis and rectus femorus
= straight alignment
anal sphincter
= closes the anus
transverse abdominis
= muscle in abdomen with crosswise alignment
Oblique
slanted or at angle
Rectus
in straight alignment with the vertical axis of the body
Sphincter
ring-like muscle that tightly constricts the opening of a passageway
named for passage involved
Transverse
in crosswise direction
Muscles named for number of divisions
biceps brachii or biceps : formed from two divisions
triceps brachii or triceps: formed from three divisions
flex and extend upper arm
ceps
head
Muscles named for size or shape
named because they are too broad or narrow, large or small
named because they resemble a familiar object
gluteus Maximus: largest muscle of the buttock
deltoid muscle: located on shoulder and shaped like inverted triangle (like the Greek letter Delta)
Muscles named for strange reasons
e.g. hamstring group
= located on back of upper leg
= three separate muscles: biceps femoris, semitendinosus, semimembraneous
= knee flexion and hip extension
named because they’re the muscles by which a butcher hangs a slaughtered pig
Muscles of the head
frontalis
temporalis
masseter
Frontalis
a.k.a occipitofrontalis
in the forehead
raise and lower eyebrows
Temporalis
move lower jaw up and back to close the mouth
Masseter
move lower jaw up to close mouth when chewing
one of the strongest of the body
Muscles of the trunk
pectoralis major
external and internal oblique muscle
rectus abdominis
transverse abdominis
pectoralis major
male : makes up the bulk of the chest muscle
female : muscle lies under the breast