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Chapter 11 The muscular system
book martini
84
Anatomy
Undergraduate 1
03/22/2012

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Term
n700 individual muscles
nContribution to homeostasis:
qStabilizes body position
qProduces movements
qRegulates organ volume
qMoves substances within the body
qProduces heat
Definition
The Muscular System does is what and does what? 
Term
Skeletal muscles 
Definition
cause movements by exerting force on tendons, which pulls on bones or other structures
Term
pulls one of the articulating bones toward the other
Definition
When a skeletal muscle contracts it 
Term
origin
Definition
One bone remains stationary or near its original position; the attachment of a tendon to the stationary bone is called the
Term
insertion
Definition
The attachment of the muscle’s other tendon to the movable bone is called the
Term
belly (body)
Definition
Fleshy portion of muscle between the tendons is called the
Term
proximal 
Definition
The origin is usually 
Term
distal
Definition
the insertion is usually 
Term
qBiceps brachii flexes the forearm at elbow joint, but its belly lies over the humerus, not the forearm
Definition
nOften muscles that move a particular body part do NOT cover that body part.
Term
opposing (antagonistic) pairs at joints (e.g., flexors vs. extensors, abductors-adductors, etc.). 
Definition
Most skeletal muscles are arranged in 
Term
Movements 
Definition
 usually result from several skeletal muscles acting as a group
Term
the prime mover or agonist (leader) 
Definition
muscle that contracts to cause the action
Term
antagonist
Definition
muscle that stretches and yields to the effects of the agonist.
Term
 
 located on opposite sides of the bone or joint 
qEx.  Flex the forearm at the elbow
nBiceps brachii is the prime mover

Triceps brachii is the antagonist

 
Definition
Prime mover and antagonist are usually located on 
Term
synergists 
Definition
To prevent unwanted movements at other joints or to otherwise aid the movement of the agonist, muscles called ? contract and stabilize intermediate joints.
Term
synergists 
Definition
are usually located close to the prime mover
Term
fixators
Definition
which stabilize the origin of the prime mover so the prime mover can act more efficiently
Term
fixators
Definition
steady the proximal end of a limb while movements occur at the distal end
Term
nprime movers, antagonists, synergists, or fixators!
Definition
Depending upon the movement required, muscles may act as 
Term
abdomen
Definition
Abdominis
Term
brachium
Definition
Brachialis
Term
wrist
Definition
Carpi
Term
clavicle
Definition
Cleido
Term
femur
Definition
Femoris
Term
ilium
Definition
Ilio
Term
eye
Definition
Oculo
Term
mouth
Definition
Oris
Term
radius
Definition
Radialis
Term
scapula
Definition
Scapularis
Term
tibia
Definition
Tibialis
Term
ulna
Definition
Ulnaris
Term
front
Definition
Anterior
Term
lateral
Definition
Lateralis
Term
medial/middle
Definition
Medialis
Term
diagonal to midline
Definition
Oblique
Term
parallel to midline
Definition
Rectus
Term
two heads
Definition
Biceps
Term
three heads
Definition
Triceps
Term
four heads
Definition
Quadriceps
Term
triangle
Definition
Deltoid
Term
circle
Definition
Orbicularis
Term
saw-toothed
Definition
Serratus
Term
long and round
Definition
Teres
Term
trapezoid
Definition
Trapezius
Term
white
Definition
Alba
Term
longest
Definition
Latissimus
Term
long
Definition
Longus
Term
larger
Definition
Major
Term
largest
Definition
Maximus
Term
smaller
Definition
Minor
Term
great, huge
Definition
Vastus
Term
moves a bone closer to the midline
Definition
Adductor
Term
Increases a joint angle
Definition
Extensor
Term
Decreases a joint angle
Definition
Flexor
Term
makes a body part rigid
Definition
Tensor
Term
like a tailor
Definition
Sartorius
Term
Action/s 
Definition
of a muscle are the main movements that occur during contraction e.g. flexion, extension, abduction, adduction, etc.
Term
Innervation
Definition
Nerve or nerves that cause contraction of each muscle
Term
Cranial Nerves
Definition
arise from lower part of brain, innervate muscles in the head region. 
Term
Spinal Nerves
Definition
arise from spinal cord within the vertebral column, innervate muscles in the rest of the body.
Term
qOccipitofrontalis (frontal belly)
qOrbicularisoculi
qOrbicularisoris

Zygomaticus major

Definition
nMuscles of facial expression 
Term
nMuscles of facial expression 
Definition
qLie within the subcutaneous layer
qUsually originate in the fascia or skull bones & insert into the skin.
Term
humerus
Definition
Scapular movements increase the range of motion of the
Term
scapula so it can function as a stable origin for the muscles that move the humerus.
Definition
Muscles that move the pectoral girdle must do so by stabilizing the
Term
scapular movements accompanying those of the humeruse.g. raising your arm above the head.
Definition
Many humeral movements would not be possible without 
Term
Deltoid
Definition
muscle gives the rounded contour of the shoulder
Term
qSubscapularis
qSupraspinatus
qInfraspinatus
qTeres minor
Definition
They form the rotator cuff
Term
rotator cuff
Definition
a nearly complete circle of tendons around the shoulder joint, like the cuff on a shirtsleeve.
Term
flexors
Definition
The biceps brachii, brachialis, and brachioradialis are
Term
extensor
Definition
The triceps brachiiis an 
Term
qHelp contain and protect the abdominal viscera
qFlex, laterally flex, and rotate vertebral column at intervertebral joints
qCompress abdomen during forced exhalation
qProduce force required for defecation, urination and childbirth
nExternal oblique
nRectus abdominis
Definition
nAs a group, the muscles of the anterolateral abdominal wall:
Term
the pelvic girdle 
Definition
Most muscles that move the femur originate on 
Term
the femur
Definition

Most muscles that move the femur insert on

 

Term
stability, locomotion, and maintenance of posture
Definition
Lower limb muscles function in 
Term
versatility of movement
Definition
upper limb muscles are characterized by 
Term
qGluteus maximus
qTensor fasciae latae
qAdductor longus
Definition
Muscles of the Gluteal Region that Move the Femur
Term
nSartorius, Quadriceps femoris group: 4 muscles, nHamstring group: 3 muscles
Definition
Muscles of the Thigh That Move the Femur (Thigh) and Tibia/Fibula (Leg)
Term
qRectus femoris
qVastuslateralis
qVastusmedialis  
qVastusintermedius
Definition
Quadriceps femoris group
Term
qBiceps femoris
qSemiendinosus
qSemimembranosus
Definition
Hamstring group
Term
nTibialis anterior

 

nGastrocnemius

 

Soleus

Definition
Muscles of the Leg that Move the Foot 
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