Anatomy and Physiology skull and trunk muscles

  1. Covers forehead, elevates eyebrows, wrinkles forehead skin horizontally
    *facial nerve VII
    *O-epicranial aponeurosis
    *I-skin of eyebrows and root of nose
  2. covers occipital bone, pulls scalp posteriorly
    *facial nerve VII
    *O-occipital and temporal bones
    *I-epicranial aponeurosis
  3. Deep to the orbicularis oculi, pulls eyebrows medially and inferiorly (wrinkles forehead vertically as in frowning)
    *facial nerve VII
    *O-arch of frontal bone above nasal bone
    *I-skin of eyebrow
    Corrugator supercilii
  4. circular muscle surrounding rim of eye; blinking, squinting, closes eye
    *facial nerve VII
    *O-frontal and maxillary bones and ligaments around orbit
    *I-tissue of eyelid
    Orbicularis oculi
  5. extends diagonally from zygomatic bone to the skin and muscle at corner of mouth; raiser lateral corners of mouth (smiling) PM
    *facial nerve VII
    *O-zygomatic bone
    *I-skin and muscle at corner of mouth
    zygomaticus major
  6. slender muscle inferior and lateral to the zygomaticus; draws corner of lip laterally, tenses lips (synergist of zygomaticus)
    *facial nerve VII
    *O-lateral fascia associated w/masseter muscle
    *I-skin at angle of mouth
  7. opens lips,raises and furrows (wrinkles) upper lip
    *facial nerve VII
    *O-zygomatic bone & ifnraorbital margin of maxilla
    *i-skin and muscle of upper lip
    levator labii superioris
  8. pulls lower lip inferiorly, pouting
    *facial nerve VII
    *O-body of mandible lateral to its midline
    *I-skin and muscle of lower lip
    depressor labii inferioris
  9. lateral to depressor labii inferioris,pulls corners of mouth inferiorly and laterally (tragedy mask)
    *facial nerve VII
    *O-body of mandible incisors 
    *I-skin & muscle at the angle of mouth below insertion of zygomaticus
    depressor anguli oris
  10. circular multilayered muscle of lips, closes lips; kissing and whistling muscle
    *facial nerve VII
    *O-arises indirectly from the maxilla and mandible
    *I-encircles mouth, inserts into muscle and skin at angles of mouth
    Orbicularis oris
  11. deep to masseter muscle, compresses cheeks inward against teeth as in whistling or sucking through a straw; begins swallowing along with the tongue
    *facial muscle VII
    *O-molar region of maxilla and mandible
    *I-orbicularis oris
  12. on anterior chin, protrudes lower lip, wrinkles the chin
    *facial VII
    *O-mandible below incisors
    *I-skin of chin
  13. prime mover in mastication, strongest muscle in the human body
    *trigeminal nerve V
    *O-zygomatic arch anc zygomatic bone
    *I-angle and ramus of mandible
  14. synergistic to masseter,elevates mandible, maintains position of mandible at rest
    *trigeminal nerve V
    *0-temporal fossa
    *I-coronoid process of manible by tendon
  15. synergistic to masseter, lateral excursion (grinding, side to side, chewing)
    *trigeminal nerve V
    lateral and medial pterygoid
  16. superficial neck flexor, rotates and laterally flexes the neck landmark
    *accessory nerve (cranial XI)
    *cervical spinal nerves C-2 and C-3
    *O-manubrium of sternum and medial portion of clavicle 
    *I-mastoid process of temporal bone
  17. located laterally on neck, deep to platysma and sternocleidomastoid;neck flexor and rotate the neck, elevates the first 2 ribs(aid in inspiration)
    *cervical spinal nerves C-2 and C-3
    *O-transverse process of cervical vertebrae
    *I-anterolaterally on first 2 ribs
  18. muscles that for the floor of the oral cavity, muscles of swallowing
  19. muscles of swallowing and speaking
  20. most superficial muscle of posterior thorax; stabilizes, elevates, retracts and rotates scapula
    *accessory nerve (cranial XI) C-3, C-4
  21. Flat, triangular muscle of the lumbar region;Prime Mover of arm extension, powerful arm adductor, medially rotates arm at shoulder.
    *Thoracodorsal nerve C-6-C-8
    latissimus dorsi
  22. deep to trapezius; elevates and adducts scapula
    *cervical spinal nerves, dorsal scapula nerves C-3-C-5
    *O-transverse processes of C-1-C-4
    *I-medial border of scapula 
    levator scapulae
  23. deep to trapezius and inferior to levator scapulae; retracts scapula (squares the shoulders)
    *dorsal scapular nerves C-4 and C-5
    • Rhomboids 
    • minor 
    • major
  24. inferior and lateral to infraspinatus, partially superficial; synergistic to the latissimus dorsi; extends, medially rotates and adducts humerus
    *lower subscapular nerve C-6 and C-7
    Teres major
  25. together the muscles extend the head and neck, unilateral head and neck rotation and laterally flexion to same side
    *cervical spinal nerves (dorsal rami)
    splenius capitis and cervicis
  26. Deep back muscle; extends vertebral column and head and rotates them to opposite side
    *spinal nerves (dorsal rami)
    • semispinalis:
    • Capitis
    • cervicis
    • thoracis
  27. muscle that forms part of the posterior abdominal wall; lateral flexion,maintains posture,assists forced inspiration
    *T-12 and upper lumbar nerves (venteral rami)
    Quadratus lumborum
  28. 3 groups of long, deep muscles that are prime movers for back extension ( arching back)
    *spinal nervers (dorsal rami)
    • Erector spinae:
    • Iliocostalis
    • Longissimus
    • Spinalis
  29. deep to trapezius, located on posterior aspect of scapula; initiates abduction, helps prevent downward dislocation of the humerus.
    *suprascapular nerve C-5-C-7
    *O-supraspinous fossa of scapula
    *I-superior part of greater tubercle of humerus
  30. Deep posterior muscle, primarily a stabilizer muscle, helping to hold head of humerus against glenoid cavity of scapula
    *suprascapular nerve C-5-C-7
    *O-infraspinous fossa of scapula
    *I-greater tubercle of humerus
  31. forms part of the posterior wall of the axilla, chief medial rotator of humerus, helps hold head of humerus in glenoid cavity
    *subscapular nerves C-3-C5
    *O-subscapular fossa of scapula
    *I-lesser tubercle of humerus
  32. deep muscle that lies inferior to infraspinatus and preforms the same actions as infraspinatus
    *axillary nerver
    *O-lateral border of dorsal scapular surface 
    *I-greater tubercle of humerus 
    teres minor
  33. superficial muscle that covers the shoulder, prime mover of arm abduction
    *axillary nerve c-5 and c-6
  34. muscle covering superior portion of chest, prime mover of arm flexion also rotates arm medially and adducts arm against resistance
    *lateral and medial pectoral nerver C-5-C-8 and T-1
    pectoralis major
  35. deep to pectoralis major, pulls scapula inferiorly and anteriorly
    * medial and lateral pectoral nerves C-6-C-8
    pectoralois  minor
  36. muscle that lies deep to scapula, inferior to pectoralis major  (boxer muscle) pushing and punching also important in abduction of arm
    *long thoracic nerve C-5-C-7
    serratus anterior
  37. Flexes and rotates trunk (8 pack, used in sit ups and curls) 
    *intercostal nerves T-6 or T-7-T12
    rectus abdominis
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Anatomy and Physiology skull and trunk muscles
A&P skull and trunk musles