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gluteus Maximus
extends thigh at hip joint; stabilizes torso at waist when climbing stairs or an incline; not active when walking horizontally
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Gluteus Medius
abducts thigh at hip joint and medially rotates thhigh
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Iliacus and Posas Major
psoas major and illiacus muscles acting together flex thigh at hip joint and flex trunk on hip as in sitting up from supine position. psosas alone laterally flexes vertebral column.
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sartorius
weakly flexes abducts and laterally rotates thigh at hip joint; weakly flexes at knee
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rectoris femoris
flexes thigh and extends leg
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vastus lateralis
extends leg
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vastus medialis
extends leg
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biceps femoris
flexes leg at knee joint and extends thigh at hip joint
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semitendinosus
flexesleg at knee joint and extends thigh at hip joint
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semimembranous
flexes leg at knee joint and extends thigh at hip joint
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soleus
plantar flexes foot at ankle joint
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tibialis anterior
dorsiflexes foot at ankle joint and inverts (supinates) foot at intertarsal joints
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gastrocenemius
plantar flexes foot at ankle joint
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extensor digitorium
dorsiflexes foot at ankle joint and extends distal and middle phalanges of each to at interphalangeal joints and proximal phalanx of each toe at metatarsalangeal joint
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temmporalis
elevates the mandible and retracts the mandible, look of suprise
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buccinator
presses cheeks against teeth and lips as in whistling blowing or sucking
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masseter
elevates the mandible as in closing mouth
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orbicularis oris
closes and protrudes lips
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orbicularis oculi
muscle encircling the eye that closes eyelids
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platysma
tenses skin of the neck
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frontalis:
-occipital
-front belly
- raises eyebrows, wrinkles skin of forehead horizontally---> surprise
- -draws the scalp porterior
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pectoralis major
adducts medially rotates and flexes arm
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deltoid
prime mover of arm abduction
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trapezius
elevates adducts abd depresses scapula (superior fibers elevate; middle fibers depresses it)
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latissimus dorsi
prime mover of arm extension; medially rotates arm.
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infraspinatus
laterally rotates arm
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teres major
medially rotates and adducts arm
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biceps brachii
flexes forarm and at elbow joint, supinates forearm at radioulnar joint
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triceps brachii
extends forearm at elbow joint
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flexor carpi ulnaris
adducts the wrist and hand
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flexor carpi radialis
flexes and abducts hand (radial deviation at wrist joint.
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flexor digitorium
flexes middle phalanx of each finger at proximal interphalangeal joint
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extensor carpi radialis
extends and abducts hand at wrist joint
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extensor carpi ulnaris
extends and adducts hand at wrist joint
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extensor digitorium
extends distal and middle phalanges of each finger at interphalangeal joints
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rectus abdominis
flexes vertebral column
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external oblique
compresses the abdomen, laterally flex and rotate vertebral column
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internal oblique
compress abdomen, laterally flex and rotate vertebral column, compress abdomen; laterally flex and rotate vertebral column
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transversus abdominis
compress abdomen
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