Location and Function of Major Skeletal Muscles
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107 Terms
Location of the epicranius, Frontalis, and Occipitalis muscles
covers cranium
Action of the epicranius, frontalis, and occipitalis muscles is:
elevates eyebrows
Location of the Orbicularis Oris muscle:
Circular muscle around the mouth
Action of the Orbicularis Oris muscle:
“kissing muscle”
Location of the Zygomaticus muscle:
zygomatic arch to corner of mouth
Action of the zygomaticus muscle:
“smiling muscle”
Location of the buccinator muscle:
hollow of cheek
Action of buccinator muscle:
compresses cheek
Location of platysma muscle:
lower jaw to neck
Action of platysma muscle:
“frowning muscle”
Location of Orbicularis Oculi muscle:
circular muscle around eye
Action of the Orbicularis Oculi muscle:
closes eye
Location of the Masseter
Zygomatic arch to lateral mandible
Action of masseter
Elevates (prime mover)
Location of the temporalis
Muscle over temporal bone
Action of the temporalis
Elevates mandible
Location of the medial Pterygoid
Medial surface of mandible
Action of the Medial Pterygoid
Elevates mandible
Location of the Lateral Pterygoid
Anterior surface of Mandibular condyle
Action of the Lateral Pterygoid
Depresses mandible
Location of the Sternocleidomastoid
Major anterior neck muscle
Action of the Sterncleidomastoid
Flexes head; rotates head
Location of the Trapezius
Posterior neck and upper back
Action of the Trapezius
Shrug shoulders
Location of the Pectoralis Minor
Muscle deep to pectoralis major
Action of the Pectoralis minor
Scapula fixator
Location of the Serratus Anterior
Saw toothed lateral thoracic muscle
Action of the Serratus Anterior
Scapula fixator
Location of the Pectoralis Major
Large fan shaped muscle; anterior chest
Action of the Pectoralis Major
Flexion of arm; medial rotation; pouring coffee
Location of the Deltoid
Triangular shaped shoulder muscle
Action of the Deltoid
Abduction of arm; extension + flexion
Location of the Latissimus Dorsi
Large back muscle; lats
Action of the Latissimus Dorsi
Swimming, climbing, rowing; extension, adduction, medial rotation
What are the “SITS” Muscles
Supraspinatus, Infrasinatus, Teres Minor, Subscapularis
“SITS” muscles are located in:
Rotator cuff
Supraspinatus:
“Starter”; initiates abduction
Infraspinatus:
Rotates arm lateral/outward
Teres Minor:
“Little helper”; rotate laterally; helps infraspinatus
Subscapularis:
Medial rotation
Location of the Biceps Brachii
Anterior upper arm
Action of the Biceps Brachii
“Prime mover”; flexor of elbow
Location of the Brachialis:
Muscle beneath the biceps Brachii
Action of the Brachialis
“Flexion” of elbow (synergist)
Location of the Brachioradialis
Brachium to radius
Action of the Brachioradialis
“Flexion” of elbow (synergist)
Location of the Triceps Brachii
Posterior upper arm muscle
Action of the Triceps Brachii
Extension of elbow
Location of the Flexor Carpi Radialis
Anterior; lateral forearm muscle
Action of the Flexor Carpi Radialis
Flexion of wrist
Location of the Flexor Carpi Ulnaris
Anterior; medial forearm muscle
Action of the Flexor Carpi Ulnaris
Flexion of wrist
Location of the Palmaris Longus
Between FCU and FCR
Action of the Palmaris Longus
Flexion of wrist (not everyone has one)
Location of the Extensor Digitorum
Posterior forearm muscle
Action of the Extensor Digitorum
Extension of fingers (not thumb)
Lines Alba=
Midsaggital white line of collagen
Location of Rectus Abdominis
Strap-like muscle from ribs to ilium “six pack”
Action of the Rectus Abdominis
Tenses abdominal wall
Location of the External Oblique
Superficial lateral oblique muscle
Action of the External Oblique
Tenses abdominal wall
Location of the Internal Oblique
Deep oblique abdominal muscle
Action of the Internal Oblique
Tenses abdominal wall
Location of the Transversus Abdominis
deepest abdominal muscle; runs perpendicular to the midline
Action of the Transversus Abdominis
tenses abdominal wall
Location of the Gluteus Maximus
Buttocks
Action of the Gluteus Maximus
Extension femur
Location of the Gluteus Medius
lateral hip muscle
Action of the Gluteus Medius
abduction femur
Location of the Adductor Longus
medial hip muscle
Action of the Adductor Longus
Adduction of femur
Location of the Rectus Femoris
anterior thigh
Action of the Rectus Femoris
extend knee
Location of the Vastus Lateralis
Lateral anterior thigh
Action of the Vastus Lateralis
extend knee
Location of the Vastus Medialis
medial anterior thigh
Action of the Vastus Medialis
extend knee
Location of the Vastus Intermedius
deep anterior thigh
Action of the Vastus Intermedius
extend knee
Location of the Sartorius
parallel strap-like muscle that crosses leg
Action of the Sartorius
Flexion of the leg and thigh
Location of the Biceps Femoris
posterior thigh
Action of the Biceps Femoris
flexes leg as knee extends thigh
Location of the Semitendinosus
posterior thigh
Action of the Semitendinosus
flexes leg as knee extends thigh
Location of the Semimembranosus
posterior thigh
Action of the Semimembranosus
flexes leg as knee extends thigh
Location of the Tibialis Anterior
anterior to tibia
Action of the Tibialis Anterior
dorsiflexion; inversion
Location of the Peroneus
lateral to fibula
Action of the Peroneus
eversion of foot
Location of the Gastrocnemius
Posterior to lower leg (calf)
Action of the Gastrocnemius
Plantar flexion (prime mover)
Location of the Soleus
muscle deep to gastrocnemius
Action of the Soleus
plantar flexion (synergist)
Location of the Levator Ani
Surround urethra and anal canal
Action of the Levator Ani
reinforces sphincters
Location of the Coccygeus
ischium to sacrum
Action of the Coccygeus
supports levator ani
Location of the Superficial Transversus Perenei
ischium to urogenital diaphragm