A&P 1 Muscles

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  1. frontalis
    Action: elevates eyebrows and wrinkles skin of forehead

    Origin: epicranial aponeurosis

    Insertion: skin of eyebrow and bridge of nose
  2. Occipitalis
    Action: pulls scalp posterior; wrinkles skin on posterior surface of neck

    origin: superior nuchal line on occipital bone

    insertion: epicranial aponeurosis (Galea aponeurotica)
  3. Nasalis
    Action: compresses nostrils, dilates nostrils

    origin: maxillary bone and cartilage of nose

    insertion: bridge of nose
  4. orbicularis oculi
    action: closes eyelids; acts during squinting and blinking

    origin: medial aspect of bony orbit

    insertion: skin around eyelids
  5. orbiculartis oris
    action: closes and purses lips as in speaking, kissing and whistling

    origin: medial bone; mandible

    insertion: lips
  6. zygomaticus major
    action: elevates corner of mouth

    origin: zygomatic bone

    insertion: angle of mouth
  7. zygomaticus minor
    action: raises upper lip

    origin: zygomatic bone

    insertion: upper lip
  8. Mentalis
    action: protudes lower lip; wrinkles skin on chin

    origin: anterior surface of mandible

    insertion: skin of chin
  9. Risorius
    action: draws corner of mouth laterally

    origin: fascia of masseter

    insertion: corner of mouth
  10. masseter
    action: elevates mandible to close jaw; protudes mandible

    origin: zygomatic arch

    insertion: lateral surface of the mandibular ramus
  11. Temporalis
    action: elevates and retracts mandible to close jaw

    origin: temporal bone

    insertion: coronoid process of mandible
  12. Sternocleidomastoid
    action: flexion and lateral flexion of neck; rotates head so that face is turned superiorly and to the opposite side

    origin: manubrium; medial third of clavicle

    insertion: mastoid process
  13. omohyoid
    action: depresses and retracts hyoid bone

    • superior belly
    •     origin: clavicle and first rib
    •     insertion: hyoid bone
    • inferior belly
    •     origin: superior margin of scapula
    •     insertion: clavicle and first rib
  14. Thyrohyoid
    action: depresses hyoid bone; elevates larynx

    origin: thyroid cartilage of larynx

    insertion: hyoid bone
  15. sternohyoid
    action: depresses larynx and hyoid bone during swallowing

    origin: manubrium

    insertion: hyoid bone
  16. stylohyoid
    action: elevates and retracts hyoid bone during swallowing and speaking

    origin: styloid process of temporal bone

    insertion: hyoid bone
  17. Mylohyoid
    Action: elevates hyoid bone and floor of mouth during swallowing and speaking

    origin: inferior margin of mandible

    insertion: hyoid bone
  18. Digastric anterior belly
    action: elevates hyoid bone and base of tongue, depresses mandible

    origin: inferior margin of mandible

    insertion; hyoid bone
  19. Digastric Posterior Belly
    action: moves hyoid bone back

    origin: mastoid process

    insertion:hyoid bone
  20. scalenes anterior
    action: laterally flexes of neck; elevates rib 1 during forced inspiration

    origin: transverse process of cervical vertebrae

    insertion: 1st rib
  21. scalenes middle
    action: lateral flexion of neck; elevates rib 1 during forced inspiration

    origin: transverse process of cervical vertebrae

    insertion: 1st rib
  22. scalenes posterior
    action: elevates 2nd rib

    origin: transverse processes of cervical vertebrae

    insertion: 2nd rib
  23. Levator Scapula
    action: elevates scapula and inferior rotation of scapula

    origin: transverse processes of superior four cervical vertebrae

    insertion: medial border of scapula near superior angle
  24. Rhomboid Minor
    Action: adducts scapula and performs downward rotation

    origin: Ligamentum nuchae; spinous processes of vertebrae c7 and T1

    Insertion: medial border of scapula
  25. Rhomboid Major
    Action: Adducts scapula and performs downward rotation

    origin: spinous processes of vertebrae T2-T5

    insertion: medial border of scapula
  26. Trapezius
    Action: elevate, retracts and depresses scapula

    origin; posterior surface of occipital bone; ligament nuchae; spinous processes of thoracic vertebrae

    Insertion: lateral third of clavicle; acromion; spine of scapula
  27. Latissimus Dorsi
    Action: extension, adduction and medial rotation of arm

    origin: spinous processes of vertebrae T6-T12; thoracolubar fascia; iliac crest; inferior three ribs

    Insertion; intertubercular groove of humerus
  28. Erector Spinae
    Action: Extension of vertebral column

    Origin: Thoracolumbar fascia; posterior surface of lacrum; iliac crest; spinous processes of T11-T12 and L1-L5

    • Insertion:
    •      Iliocostalis: angles of ribs and transerve processes of C4-C6
    •      Longissimus: transverse processes of thoracic and cervical vertrabe, ect.
    •       Spinalis: Spinous processes of thoracic and cervical vertebrae
  29. Inferior serratus posterior
    Action: pulls ribs down, resisting pull of the diaphragm

    origin: spinous processes of the lower two thoracic and upper two or three lumbar vertebrae

    insertion: lower borders of the bottom four ribs
  30. Splenius
    •Action: Extension of head and neck; lateral flexion and rotation of the head and neck

    •Origin: Spinous processes of inferior cervical and superior thoracic vertebrae

    •Insertion: mastoid process, occipital bone, and transverse processes of superior cervical vertebrae
  31. Internal Intercostal
    •Action: Depresses rib cage during forced expiration

    • Origin: Superior border of inferior rib

    •Insertion: Inferior border of superior rib
  32. External Intercostal
    •Action: Elevates rib cage during inspiration

    •Origin: Inferior border of superior rib

    •Insertion: Superior border of inferior rib
  33. Serratus Anterior
    • •Action: Holds scapula to chest wall,
    • •Protraction and superior rotation of scapula
    • •Origin: External surfaces of ribs 1-8
    • •Insertion: Medial border of scapula
  34. Pectoralis Minor
    • •Action: Draws scapula down and forward and elevates ribs
    • •Origin: External surfaces of ribs 3-5
    • •Insertion: Coracoid process of scapula
  35. Pectoralis Major
    Action: Flexes, adducts, and medially rotates humerus, draws body upward in climbing

    Origin: Medial half of clavicle; sternum; costal cartilages of ribs 1-6

    Insertion: lateral lip of intertubercular groove on humerus
  36. •Subscapularis
    • •Action: Adduction and medial rotation of arm.
    • •Origin: Subscapular fossa of scapula
    • •Insertion: lesser tubercle of humerus
  37. •Supraspinatus
    • •Action: Abduction of arm
    • •Origin: supraspinous fossa of scapula
    • •Insertion: Greater tubercle of humerus
  38. •Infraspinatus
    • •Action:  Lateral rotation of arm
    • •Origin: Infraspinous fossa of scapula
    • •Insertion: Greater tubercle of humerus
  39. •Teres minor
    • •Action:  Lateral rotation of the arm
    • •Origin: Lateral border of scapula
    • •Insertion: Greater tubercle of humerus
  40. •Teres major
    • •Action: Extension, adduction and medial rotation of arm
    • •Origin: Scapula, near inferior angle
    • •Insertion: medial lip of intertubercular groove of the humerus
  41. •Deltoid
    • Action:
    •     •Anterior fibers: medial rotation and flexion of arm
    •     •Middle fibers: abduction of arm
    •     •Posterior fibers: lateral rotation and extension of arm

    •Origin: Lateral third of clavicle; acromion process; spine of scapula

    •Insertion: Deltoid tuberosity of humerus
  42. •Diaphragm
    • •Action: Increases volume of thoracic cavity by pulling central tendon inferiorly
    • •Origin: Xiphoid process and inferior six ribs
    • •Insertion: central tendon of diaphragm
  43. •Rectus Abdominis
    • •Action: Tenses abdominal wall and flexes vertebral column
    • •Origin: Pubic crest; pubic symphysis
    • •Insertion: Xiphoid process, costal cartilages of ribs 5-7
  44. External Abdominal Oblique
    • •Action: Compresses abdomen, contralaterally rotates and flexes vertebral column
    • •Origin: External surfaces of inferior 8 ribs.
    • Insertion: Linea alba; pubic crest; pubic tubercle; iliac crest
  45. Internal Abdominal Oblique
    • •Action: Compresses abdomen, ipsilaterally rotates and flexes vertebral column
    • •Origin: Thoracolumbar fascia; iliac crest; inguinal ligament
    • Insertion: Linea alba; pubic crest; inferior three or four ribs
  46. Transverse Abdominis
    • •Action: Compresses abdomen
    • •Origin: Thoracolumbar fascia; inguinal ligament; costal cartilages of inferior six ribs; iliac crest
    • •Insertion: linea alba; pubic crest
  47. •Biceps brachii
    • •Action: Flexion and supination of forearm; flexion of arm
    • •Origin: Long head: superior margin of glenoid fossa of scapula
    • •Short head: coracoid process of scapula
    • •Insertion: radial tuberosity of radius
  48. •Brachialis
    • •Action: Flexion of forearm
    • •Origin: Anterior surface  of humerus
    • •Insertion: Coronoid process of ulna
  49. Coracobrachialis
    • •Action: Flexion and adduction of arm
    • •Origin: Coracoid process of scapula
    • •Insertion: Medial surface of humerus
  50. •Triceps brachii
    Action:  Extension of forearm; long head extends and adducts arm

    • Origin: Long head: inferior margin of glenoid fossa
    •      •Lateral head: posterior surface of humerus
    •      •Medial head: posterior surface inferior to lateral head

    •Insertion: Olecranon process of ulna
Card Set
A&P 1 Muscles
A&P 1 Muscles
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