RA Muscles

  1. Muscles of Cranium
    • Occipito frontalis
    • Acricularis
    • Anterior
    • Superior
    • Posterior
  2. Occipito Frontalis a.k.a frontalis/epicraniums
    • a very large muscle which covers the top & sides of the skull
    • composed of two broad bellies which are connected by the galea apon eurotica or epicranial aponeurois
  3. Anterior (ventral)
    before or in front of; refers to the ventral or front side of the body; before, in relation to time or space; in front of or in the front part of: ventral, hemal, as contrasted with dorsal, neural
  4. Superior
    higher than; situated above something else; higher; opposite of inferior.
  5. Posterior (Dorsal)
    following after; hence located behind; opposite of anterior; toward the back; opposite of anterior
  6. Muscles of Mastication
    • Temporalis
    • Masseter
    • Pterygoidens Medials and Laterials
  7. Temporalis (2)
    *a broad, radiating muscle shaped like a fan is the strongest of the chewing muscles it retrieves the low jaw brings the teeth together has no effect surface form
  8. masseter (2)
    • *it receives its name from its action
    • *chewing (mastication)
    • *when contracted it raises the lower jaw
  9. pterygoidens medialas & laterials (2)
    • *known as pterygoids
    • *they do not affect surface form
    • *deep muscles which permit side to side movement of the lower jaw
    • *originate from the processes of the sphenoid bone
    • *ptergoids do not actually tear, they grind
  10. Muscles of the Eyes
    • Orbicularis Oculi
    • Corrugator
    • Levator Palpebra Superioris
    • OOCLPS
  11. Orbicularis Oculi (2)
    • *means sphincter/ oculi means eyes
    • *the broad thin sphincter muscle surronding the eye
    • "reflection of thought"
  12. Corrugator (2) paper or tin*
    • *frowning muscle
    • *small, narrow pyramidal in shape located at the medial end of the eyebrow
    • *when the two corrugators contract they produced verticle furrows between the eyebrows
    • *think of corrugated paper or a sheet of corrugated tin
    • "frowning"
  13. Levator Palpebra Superioris (2)
    • *the elevator of the upper eyelid
    • *contraction raises the upper eyelid
    • *it's originates deep in the eyesocket
    • *it's long, thin, flat and triangular in shape
    • *when it is immpossible to close the upper eyelid, this muscle may be severed
  14. Muscles of the Nose
    • Procerus
    • Nasalis
  15. Procerus (1) rinosouraus*
    • *when this muscle contracts, the medial ends of the eyebrows are drawn down
    • *forms transverse wrinkles across the root of the nose (Transverse Intercileary Sulci)
    • *long, thin slip muscle
    • *extends vertically from the lower part of the nasal bone to the lower part of the forehead
  16. Nasalis (1)
    • *muscles of the lower part of the nose
    • *serves to elevate, dialate, dipress and contract the nostrils
    • *muscle fibers run horizontally (across) the nose
    • *as opposed to the procerus muscle which run vertically, up the nose
  17. Muscles of the Mouth
    • Orbicularis Oris (2)
    • Quadratus Labii Superioris (3)
    • Levator Labii Superioris Alaeque Nasi (2)
    • Levator Labii Superiors (2)
    • Zygomaticus Minor (2)
    • Zygomatic Major (2)
    • Levator Anguli Oris (2)
    • Buccinator (2)
    • Risorius (2)
    • Depressor Anguli Oris (Triangularis) (2)
    • Mentalis (1)
  18. Orbicularis Oris (puckering or whistling) 2
    • *the sphincter muscle which encircles the mouth
    • *contraction of the orbiculars oris closes the lips
    • *unlike the sphincter of the eye it is composed primarily of fibers from other facial & lip muscles
  19. Quadratus Labii Superioris (a group of 3)
    • *which act independently or in unison
    • *broad origin, extending along the entire lower margin of the eyesocket
    • 1. levator labii superioris alaeque nasi (2)
    • 2. levator labii superioris (2)
    • 3. zygomaticus minor (2)
  20. Levator
  21. labii
  22. superioris
    superior (upper)
  23. alaque
  24. nasi
  25. Levator Labii Superioris Alaeque Nasi (2)
    (common elevator)
    • *the medial muscle of the QLS
    • *the common elevator of the upper lip & the wing of the nose
    • *described as long narrow slip running beside the nose
    • *the Elvis muscle (or the sneering muscle)
  26. Alaeque Nasi is Latin for
    "wing of the nose"
  27. Levator Labii Superiors (2)
    • *middle (intermediate) muscle of the threee QLS Group
    • *lateral to the LLSAN it raises the upper lip
  28. Zygomaticus Minor (2)
    • *the lateral muscle of the three QLS
    • *inserts into the upper lip at the angle of the mouth, it raises the corners of the mouth & is thus *used in smiling
  29. Zygomatic Major (2)
    (smiling or laughing)
    • *lateral to the Quadratus Labii Superiouris
    • *draws the angle of the mouth backward & upward
    • *the laughing or smiling muscle helps create the prominence of the nasil labial fold
    • *contributes the fullness of the Angulus Oris Eminence
  30. Levator Anguli Oris (2)
    • *elevator of the angle of the mouth it's located near the region of the canine tooth
    • *originates from the canine fossa hidden behind the Quadratus Labii Superiors
  31. Buccinator (2)
    • *the "trumpeter" muscle
    • *a quadrilateral muscle in soft area of the cheek
    • *principal muscle of the cheek & and the lateral wall of the mouth
  32. Risorius (2)
    (false smile)
    • *a narrow superficial muscle which runs across the cheek
    • *originates in the fassia over the masseter muscle
    • *antagonistic to the buccinator
    • *creates a "false smile"
  33. Depressor Anguli Oris (Triangularis) 2
    • *three sided muscle approaches the mouth from below when contracted it depresses the angle of the mouth
    • *contributes to the prominence of the anguius oris eminence
  34. Depressor Labii Inferioris a.k.a. Quadratus
    (fear or distaste)
    • approaches the lower lip from below
    • when contracted:
    • it pulls the lower lip downward and a little to the side
    • changes the form of the line of closure of the mouth
    • the angulus oris sulcus become oblique in form
  35. Mentalis (1)
    • *wrinkles the chin
    • *raises and protrudes the lower lip
    • *located on the prominence of the mental eminence and between the two depressor labii inferioris *muscles
    • *inserts into the skin of the chin
  36. Muscles of the Neck
    • Platysma
    • Sternocleidomastiod
    • Digastricus
  37. Platysma(2)
    • the platysma is a broad, flat and superficial muscle
    • *it arises from the fascia covering the large muscles in the region of the collar bone, ribs and shoulder
    • *the platysma softens the contour of the neck it is responsible for transverse wrinkles of the neck
  38. Sternocleidomastoideus (2)
    • *is a thick muscle which passes obliquely across the side of the neck together these muscles are used to measure the widest part of the neck
    • *the muscle arises at two points, the sternum and the clavicle, very close to the midline
    • *a small trinangular intervail lies between these heads
    • *this is an important muscle to embalmers contraction draws the head sideways alternate action *rotates the head when coordinated the head is pulled forward
  39. Digastricus (2)
    • a double bellied muscle which lies below the body of the mandible
    • the anterior belly of the two muscles is responsible for one form of the cords of the neck
  40. superficial to the temporalis are three thin muscles in the region of the ear:
    • auriculares muscles
    • 1. anterior auricular
    • 2. superior auricular
    • 3. inferior auricular

    they have more effect on the scalp than the ear, they have no influence on surface form
Card Set
RA Muscles
RA Muscles