Muscles

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Author:
thinkrussia
ID:
144756
Filename:
Muscles
Updated:
2012-03-30 13:24:45
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Insertion origin action
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Description:
Anatomy 2320
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  1. frontal belly of occipitofrontalis
    • Origin: frontal bone and skin of forehead
    • Insertion: galea aponeurotica
    • Action: elevates the eyebrows, wrinkles skin of forehead
  2. occipital belly of occipitofrontalis
    • Origin: superior nuchal line
    • Insertion: galea aponeurotica
    • Action: retracts the scalp slightly
  3. orbicularis oris
    • Origin: maxilla and mandible as well as fascia and fibers from other muscles
    • Insertion: skin and lips surrounding mough
    • Action: closes lips, puckers up the lips
  4. masseter
    • Origin: zygomatic arch
    • Insertion: lateral surface of ramus and angle of mandible and of coronoid process
    • Action: elevates and protracts mandible
  5. temporalis
    • Origin: superior and inferior portions of temporal bone
    • Insertion: coronoid process of mandible
    • Action: elevates and retracts mandible
  6. buccinator
    • Origin: maxilla and mandible
    • Insertion: orbicularis oris
    • Action: compresses the cheek
  7. medial pterygoid
    • Origin: pterygoid process of sphenoid bone
    • Insertion: medial surface of ramus of mandible
    • Action: elevate and protract mandible and moves it laterally
  8. lateral pterygoid
    • Origin: pterygoid process of spenoid bone
    • Insertion: mandibular condyle
    • Action: elevate and protract mandible and moves is laterally
  9. sternocleidomastoid
    • Origin: manubrium and sternal end of clavicles
    • Insertion: mastoid processes of the temporal bones
    • Action: both contracted; head is pulled forward and down, one contracts; head turns oppiste direction of side contracted
  10. platysma
    • Origin: fascia of deltoid and pectoralis major plus acromion of scapula
    • Insertion: skin of cheek and mandible
    • Action: pulls lower lip inferiorly, tenses skin of neck
  11. splenious capitus
    • Origin: ligamentum nuchae, ligament that runs length of cervical
    • Insertion: occipital bone and mastoid process of temporal bone
    • Action: both contract; extends head/neck. Unilateral contraction turns the head and neck to the same side
  12. semispinalis capitus
    • Origin: seventh cervical and first six thorasic
    • Insertion: between the superior and inferior nuchal lines of occipital bone
    • Action: both contract; extends head/neck. Unilateral contraction turns the head and neck to the same side
  13. serratus anterior
    • Origin: upper ribs (lateral surface 1-8)
    • Insertion: medial border of scapula
    • Action: pulls scapula forward and down, superiorly rotates scapula
  14. pectoralis minor
    • Origin: sternal end of upper ribs (3,4, and 5)
    • Insertion: coracoid process of scapula
    • Action: pulls scapula forward and down
  15. rhomboideus major
    • Origin: spines of (c7-t1)
    • Insertion: medial border of scapua
    • Action: elvates and adducts scapula, inferiorly rotate the scapua
  16. rhomboideus major
    • Origin: spines of t2-t5
    • Insertion: medial border of scapula
    • Action:elevates and adducts scapula, inferiorly rotate the scapula
  17. trapezius
    • Origin: ligamentum nuchae, spinous processes of c7-t12 and occipital bone, superior nuchal line
    • Insertion: clavicle, spine of scapula, acromion of scapula
    • Action: elevates and adducts scapula, draws head back
  18. pectoralis major
    • Origin: medial clavicle, sternum, costal cartilage of upper ribs
    • Insertion: lateral portion of the intertubercular groove of the humerus
    • Action: flexes, adducts, and rotates arm medially at shoulder joint
  19. latissimus dorsi
    • Origin: spinous processes of lower thoracic vertebrae, lower ribs, iliac crest, thoracolumbar fascia
    • Insertion: interbubercular groove of the humerus
    • Action: extends and adducts arm at shoulder joint, draws humerus down and back while rotating it medially
  20. deltoid
    • Origin: clavicle, the acromion and spine of scapula
    • Insertion: deltoid tuberosity of the humerus
    • Action: anterior fibers flex and medially rotate, middle fibers abduction, posterior fibers extend and laterally rotate arm
  21. coracobrachialis
    • Origin: coracoid process of scapula
    • Insertion: middle medial shaft of humerus
    • Action: adducts and flexes arm
  22. supraspinatus
    • Origin: supraspinous fossa of scapula
    • Insertion: greater tubercle of the humerus
    • Action: abducts and laterally rotates shoulder joint (start of baseball pitch)
  23. infraspinatus
    • Origin: infraspinous fossa of scapula
    • Insertion: greater tubercle of the humerus
    • Action: adducts and laterally rotates shoulder joint
  24. subscapularis
    • Origin: subscapular fossa
    • Insertion: lesser tubercle of the humerus
    • Action: rotates humerus medially, stabilizes
  25. teres minor
    • Origin: lateral border of the scapula
    • Insertion: greater tubercle of the humerus
    • Action: adducts and laterally rotates shoulder joint
  26. teres major
    • Origin: lateral border and inferior angle of the scapula
    • Insertion: lesser tubercle of humerus
    • Action: extends and adducts arm at shoulder joint, drawing it down and back while rotating it medially
  27. biceps brachii
    • Origin: 1) long head supraglenoid tubercle of scapula 2) short head coracoid
    • Insertion: radial tuberosity of radius and bicipital aponeurosis
    • Action: flexes the elbow joint, powerful supinator of forearm at the elbow joint, flexes arm
  28. triceps brachii
    • Origin: 1) long head, infraglenoid tubercle of scapula 2) lateral head, above radial groove of humerus 3) medial head, below the radial groove of the humerus
    • Insertion: olecranon of ulna
    • Action: extends the elbow joint
  29. external oblique
    • Origin: external inferior border of lower ribs
    • Insertion: linea alba by a broad aponeurosis and some to iliac crest
    • Action: both contract they compress the abdomen and flex the vertebral column, when one contracts it causes lateral rotation
  30. internal oblique
    • Origin: iliac crest, lumbar fascia, and inguinal ligament
    • Insertion: linea alba, lower ribs and costal cartilage
    • Action: same as external obliques
  31. transverse abdominis
    • Origin: iliac crest, lumbar fascia, costal cartilage of lower ribs, inguinal ligament
    • Insertion: xiphoid process, linea alba, and pubis
    • Action: compresses the abdomen
  32. rectus abdominis
    • Origin: symphysis pubis
    • Insertion: xiphoid process, inferior surfaces of middle ribs
    • Action: flexes the vertebral column and compresses the abdomin
  33. diaphragm
    • Origin: xiphoid process, costal cartilage, lumbar vertebrae, inferior internal suface of lower ribs
    • Insertion: central tendon
    • Action: pulls central tendon inferiorly, increasing vertical dimention of thorax
  34. linea alba
    seperates abs
  35. linia semilunaris
    outside of abs
  36. inguinal ligament
    spans distance between body of pubis and anterior superior iliac spine
  37. gluteus maximus
    • Origin: iliac crest, sacrum, coccyx
    • Insertion: linea aspera of the femur and iliotibial tract of fascia latae
    • Action: extends thigh, also laterally rotates thigh
  38. tensor fasciae latae
    • Origin: iliac crest and lateral surface of anterior superior iliac spine
    • Insertion: IT tract
    • Action: abducts thigh at the hip joint
  39. gracilis
    • Origin: inferior edge of ramus of pubis, near symphysis pubis
    • Insertion: proximal medial surface of tibia
    • Action: adducts thigh at hip joint, flexes leg at knee joint
  40. sartorius
    • Origin: anterior superior iliac spine
    • Insertion: medial side of tibial tuberosity
    • Action: flexes thigh and rotates thigh laterally, crosses legs
  41. rectus femoris
    • Origin: anterior inferior iliac spine
    • Insertion: quadricps tendon to patella and then patellar ligament to tibial tuberosity
    • Action: causes leg flexion of the leg at the aetabulofemoral joint, extends leg at knee joint
  42. vastus lateralis
    • Origin: greater trochanter and linea aspera of femur
    • Insertion: quadricepts tendon to patella and then patellar ligament to tibial tuberosity
    • Action: extends leg at knee joint
  43. vastus medialus
    • Origin: linea aspera and intertrochanteric line of femur
    • Insertion: quadriceps tendon to patella and then patellar ligament to tibial tuberosity
    • Action: extends leg at knee joint
  44. vastus intermedius
    • Origin: anterior and later surfaces of femur
    • Insertion: quadricepts tendon to patella and then patellar ligament to tibial tuberosity
    • Action: extends leg at knee joint
  45. biceps femoris
    • Origin: long head, ischial tuberosity, short head, linea aspera
    • Insertion: long head, head of fibula, short, lateral condyle of tibia
    • Action: extends thigh and flexes knee joint, laterally rotates thigh
  46. semitendinosus
    • Origin: iscial tuberosity
    • Insertion: proximal medial surface of tibia
    • Action: extends thigh and flexes knee joint and medially rotates thigh
  47. semimembranosus
    • Origin: ischial tuberosity
    • Insertion: posterior surface of medial condyle of tibia
    • Action: extends thight and flexes knee joint and medially rotates thigh
  48. tibialis anterior
    • Origin: lateral condyle and proximal shaft of tibia
    • Insertion: 1st metatarsal and 1st tarsal bone
    • Action: dorsiflexes and inverts foot at ankle
  49. peroneus (fibularis) longus
    • Origin: lateral condyle of tibia, head and body of fibula
    • Insertion: 1st metatarsal and 1st tarsal bone
    • Action: plantar flexes and everts foot at ankle
  50. gastrocnemius
    • Origin: superior posterior lateral and medial condyles of femur
    • Insertion: calcaneus via the calcaneal tendon
    • Action: plantar flexes foot at ankle and flexes knee joint
  51. soleus
    • Origin: head and proximal shaft of fibula, and medial border of tibia
    • Insertion: calcaneus via the calcaneal tendon
    • Action: plantar flexes foot at ankle

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