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frontal belly of the epiccranius (frontalis)
OIA?
- 1. orgin:galea aponeurotica
- 2. Instertion:skin of eyebrow root of nose
- 3. Action: raises eyebrows wrinkles forehead horizontaly
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zygomaticus
OIA?
- orgin: zygomatic bone
- insertion:skin and muscle at corner of mouth
- action: raises lateral corner of mouth. smiling muscle
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temporalis
OIA?
- origin:temporal fossa
- insertion:coronoid process of the mandible
- action:elevates and retracts the mandible,maintains position of the mandible
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masseter
OIA?
- origin: zygomatic arch and maxilla
- insertion: angle and ramus of the mandible
- action:prime mover of the jaw,elevates the mandible
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sternocleidomastoid
OIA?
- origin:manubrium of sternum and medical portion of clavicle
- insertion:mastoid process of temporal bone and superior nuchal line of occipatal bone
- action: prime mover of head flexion,simultaneous contraction of both causes neck flexion, laterally flexes head to one side
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depressor labii inferious
OIA?
- origin:body of mandible lateral to its midline
- insertion: skin and muscle of the lower lip
- action:draws lower lip infeiorly(pout)
-
orbicularis
A?
closes lips,protudes lips, kissing whistling
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stylohyoid
OIA?
- origin:styloid process of temporal bone
- insertion:hyoid bone
- action: elevates the and retracts the hyoid bone. thereby elongating the floor of the mouth during swallowing
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sternohyoid
OIA?
- origin:manubrium and medial end of clavicle
- insertion: lower margin of hyoid bone
- action:depresses larynx and hyoid bone if mandible is fixed may also flex skull
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sternothyroid
OIA?
- origin: posterior surface of manubrium of sternum
- insertion:thyroid cartilage
- action:pulls thyroid cartlilage
-
pectoralis major
A?
prime mover or arm flexion,roates it medially,adducts arm against resistance,fixed with scapula can pull rip cage upward can help(climbing throwing pusing and forced inspiration
-
deltoid
A?
prime mover of arm abduction when contracted,antagonast of pectoralis majorwhich adducts arm
-
latissimus dorsi
A?
- prime mover of arm extension
- powerful arm adductor
- medially rotates arm at shoulder
- depresses scapula important role in bringing arm downin a powerful stroke(hammering swimming)
-
trapezius
A?
stabilizes raises retracts and rotates scapula
-
triceps brachii
A?
powerful forearm extensor (prime mover)
-
biceps brachii
A?
- flexes elbow joint and supinates forearm
- weak flexor of arm at shoulder
-
brachialis
A?
- major forearm flexor
- lifts ulna as biceps lifts the radius
-
gracilis
A?
- adducts thigh
- flexes and medially rotates thigh especially during walking
- flexes the knee
-
rectus femoris
A?
extends knee and flexes thigh at hip
-
gluteus maximus
A?
- major extensior of thigh
- laterially rotates and abducts thigh
-
biceps femoris
A
- extends thigh and flexes knee
- laterially rotates leg
- especilly when knee is flexed
-
tibialis anterior
A?
- prime mover of dorsiflexion
- inverts foot
- assists in supporting medial longitudinal arch of foot
-
gastrocnemius
A?
- plantar flexes foot when knee is extended
- can flex knee when foot is dorsiflexed
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