Muscle ID, etc. Flashcards
What’s the action of the frontalis?
elevates the eyebrows
What’s the action of the temporalis?
closes jaws by elevating mandible
What’s the action of the orbicularis oculi?
contracts individually around the eye (blinking, winking, squinting)
What’s the action of the orbicularis oris?
closes, purses, and protrudes the lips
What’s the action of the masseter?
agonist in elevating the mandible
What’s the action of the risorius?
draws angle of the mouth laterally
What’s the action of the modiolus?
point of muscle origins and insertions
What’s the action of the buccinator?
retraction of the mandible
What’s the action of the digastric?
open mouth; depress mandible; elevate hyoid
What’s the action of the stylohyoid?
elevates and retracts hyoid
What’s the action of the mylohyoid?
elevates hyoid and floor of mouth
What’s the action of the platysma?
depresses mandible; pulls down lower lip; tenses neck skin
What’s the action of the sternohyoid?
depresses hyoid
What’s the action of the sternocleidomastoid?
head and neck flexion; rotation of the head
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Frontalis
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temporalis
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orbicularis oculi
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orbicularis oris
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masseter
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risorius
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buccinator
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digastric
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stylohyoid
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mylohyoid
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platysma
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sternohyoid
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sternocleidomastoid
What’s the action of the scalenes?
ipsilateral flexion or contralateral rotation of the head; elvates ribs
What’s the action of the trapezius?
laterally flexes neck; elevate, depress, retract, and laterally rotate scapula
What’s the action of the pectoralis major?
agonist in flexion, adduction and medial rotation of the humerus; synergist in forced inspiration
What’s the action of the pectoralis minor?
syngergist in scapula protraction, abduction and raising of arm
What’s the action of the serratus anterior?
prime mover to protract scapula, abduction and raising of arm (punching); “boxer’s muscle”
What’s the action of the supraspinatus?
abduction of arm; stabilizes shoulder
What’s the action of the infraspinatus?
rotates humerus laterally; stabilzes shoulder
What’s the action of the teres minor?
rotates humerus laterally; stabilzes shoulder
What’s the action of the subscapularis?
rotates humerus medially; stabilizes shoulder
Which four muscles comprise the rotator cuff (RTC)?
supraspinatus, infraspinatus, teres minor, subscapularis
What’s the action of the deltoid?
agonist in arm abduction, flexion and medial rotation of humerus
What’s the action of the teres major?
medially rotates and adducts the humerus; synergist of latissumus dorsi
What’s the action of the coracobrachialis?
flexes and medially rotates the arm
What’s the action of the latissimus dorsi?
adducts and extends arm; depresses scapula
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Scalenes
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Trapezius
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Pectoralis major
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Pectoralis minor
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Serratus anterior
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Supraspinatus
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Infraspinatus
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Teres minor
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Subscapularis
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Deltoid
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Teres major
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Coracobrachialis
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latissimus dorsi
What’s the action of the external intercostals?
elevates rib cage during inhalation
What’s the action of the internal intercostals?
elevates rib cage during inhalation; depresses rib cage during forced exhalation
What’s the action of the diaphragm?
agonist of inspiration; flattens to increase thoracic volume
What’s the action of the external oblique?
aids in flexion of the vertebral column; trunk rotation
What’s the action of the internal oblique?
aids in flexion of the vertebral column; trunk rotation
What’s the action of the transverse abdominus?
compresses abdomen
What’s the action of the rectus abdominus?
flexes lumbar region
What’s the action of the linea alba?
separates rectus abdominus; insertion point of transverse abdominus
What’s the action of the brachialis?
agonist of forearm flexion
What’s the action of the biceps brachii?
synergist of elbow flexion; supination of forearm
What’s the action of the triceps brachii?
agonist in forearm extension
What’s the action of the pronator teres?
pronates forearm
What’s the action of the brachioradialis?
synergist in forearm flexion
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external intercostals
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internal intercostals
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diaphragm
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external oblique
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internal oblique
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transverse abdominus
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rectus abdominus
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linea alba
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brachialis
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biceps brachii
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triceps brachii
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pronator teres
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brachioradialis
