Muscle action and function Flashcards
Biceps brachii
Anterior compartment of arm, flexes the formearm
Triceps brachii
Posterior compartment of arm, extends the foremarm
Hamstrings
group of three muscles in the posterior compartment of the thigh, flexes the leg
Quadriceps femoris
Groups of four muscles in the anterior compartment of the thigh, extends the leg
Flexor digitorum superficialis and flexor digitorum profundus
Anterior compartment of the forearm, flex the fingers and hand at the wrist
Extensor digitorum
Posterior compartment of the forearm, extends the fingers and the hand at the wrist
Occipital-frontalis frontal side
Raises/ furrow brow
Occipital-frontalis occipital side
Unfurrow brow
Currugator superciliii
Draws eyebrows medially and downward; frowning
Nasalis muscle
At the maxilla and widens nostrils
Levator labii superioris
Mouth muscle and raises upper lip
Depressor labii inferioris
Draws lower lip downward
Depressor angulus oris
Opening mouth and sliding lower jaw left and right
Zygomaticus major
Draws angle of the mouth upward and laterally, smiling
Orbicularis oris
Shaping of lips like during speech
Buccinator
Lateral movement of cheeks, like sucking on straws, compress air in mouth while blowing
Risorius
Draws angle of mouth laterally, expressing horror
Mentalis
Elevates and protrudes lower lip and skin of the chin
Extrinsic eye muscles
Move the eyeball and they originate from the bones of the orbit and insert onto the outer surface of the white of the eye
Superior rectus
Moves eyes up and toward nose
Inferior rectus
Moves eyes down and toward nose
Lateral rectus
Move eyes away from nose
Medial rectus
Moves eyes toward nose
Inferior oblique
Moves eyes up and away from nose, rotates eyeballs
Superior oblique
Moves eyes down and away from nose, rotates eyeballs
Levator palpabrae superioris
Opens eyes
Orbicularis oculi
Closes eyelids
Masseter
Closes mouth and aids chewing, elevates
Temporalis
Closes mouth, pulls lower jaw in under upper jaw, elevates and retracts
Lateral pterygoid
Opens mouth, pushes lower jaw out under upper jaw, moves lower jaw side to side, depressor
Medial pterygoid
Closes mouth, pushes lower jaw out under upper jaw, moves jaw upper side to side
Glenioglossus
Draws tongue to one side, depresses midline of tongue or protrudes it