Human Anatomy

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Author:
JLonghurst
ID:
25507
Filename:
Human Anatomy
Updated:
2010-07-01 23:30:46
Tags:
Head Neck Abdomen Thorax
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Description:
Muscle of the Head and Neck, and Abdomen and Thorax
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  1. Orbicularis Oris:
    Innervation
    Fascial Nerve (CN VII)
  2. Obicularis Oris:
    Actions
    Tonus closes oral fissure; phasic contraction compresses and protrudes lips (kissing) or resists distension (when blowing)
  3. Zygomaticus Major:
    Innervation
    Fascial Nerve (CN VII)
  4. Zygomaticus Major:
    Action
    Part of dilators of mouth; elevate labial commissure-bilaterally to smile (happiness); unilaterally to sneer (disdain)
  5. Levator Labii Superioris: Innervation
    Fascial Nerve (CN VII)
  6. Levator Labii Superioris: Action
    Part of dilators of mouth; retract (elevate) and/or evert upper lip; deepen nasolabial sulcus (showing sadness)
  7. Orbicularis Oculi: Innervation
    Fascial Nerve (CN VII)
  8. Orbicularis Oculi: Actions
    Closes eyelids; palpebral part does so gently; orbital part tightly (winking)
  9. Depressor Anguli Oris: Innervation
    Fascial Nerve (CN VII)
  10. Depressor Anguli Oris: Action
    Part of dilators of mouth; depresses labial commissure bilaterally to frown (sadness)
  11. Depressor Labii Inferioris: Innervation
    Fascial Nerve (CN VII)
  12. Depressor Labii Inferioris: Action
    Part dilators of mouth; retracts (depresses) and/or exerts lower lip (pouting, sadness)
  13. Buccinator: Innervation
    Fascial Nerve (CN VII)
  14. Buccinator: Action
    Presses cheek against molar teeth; works with tongue to keep food between occlusal surfaces and out of oral vestibule; resists distension (when blowing)
  15. Mentalis: Innervation
    Fascial Nerve (CN VII)
  16. Mentalis: Action
    Elevates and protrudes lower lip; elevates skin of chin (showing doubt)
  17. Platysma: Innveration
    Fascial Nerve (CN VII)
  18. Platysma: Action
    Depresses mandible (against resistance); tenses skin of inferior face and neck (conveying tension and stress)
  19. Temporalis: Proximal Attachments
    Triangular muscle with broad attachment to floor of temporal fossa and deep surface of temporal fascia
  20. Temporalis: Distal
    Narrow attachment to tip and medial surface of coronoid process and anterior border of ramus of mandible
  21. Temporalis: Innervation
    Anterior trunk of mandibular nerve (CN V3)
  22. Temporalis: Action
    Elevates mandible, closing jaws; posterior, more horizontal fibers are 1st restractors of mandible
  23. Masseter: Proximal Attachment
    Quadrate muscle attaching to inferior border and medial surface of maxillary process of zygomatic bone and the zygomatic arch
  24. Masseter: Distal Attachment
    Angle and lateral surface of ramus of mandible
  25. Masseter: Innervation
    Anterior trunk of mandibular nerve (CN V3)
  26. Masseter: Actions
    Elevates mandible, closing jaws; superficial fibers make limited contribution to protrusion of mandible
  27. Lateral Pterygoids: Proximal
    Triangular two-headed muscle from 1) infratemporal surface and crest of greater wing of sphenoid and 2) lateral surface of lateral pterygoid plate
  28. Lateral Pterygoids: Distal Attachments
    Upper head attachments primarily to joint capsule and articular disc of TMJ; inferior head attaches primarily to pterygoid fovea on anteromedial aspect of neck and condyloid process of madible
  29. Lateral Pterygoids: Innervation
    Anterior trunk of mandibular nerve (CN V3)
  30. Lateral Pterygoids: Action
    Acting bilaterally, protracts mandible and depresses chin; acting unilaterally, swings jaw toward contralateral side; alternate unilateral contraction produces larger lateral chewing movements
  31. Medial Pterygoids: Proximal Attachment
    Quadrangular two-headed muscle from 1) medial surface of lateral pterygoid plate and pyramidal process of palatine bone and 2) tuberosity of maxilla
  32. Medial Pterygoids: Distal Attachment
    Medial surface of ramus of mandible, inferior to mandibular foramen;
  33. Medial Pterygoids: Innervation
    Anterior trunk of mandibular nerve (CN V3), via medial pterygoid nerve
  34. Medial Pterygoids: Action
    Acts synergistically with masseter to elevate mandible; contributes to protrusion; alternate unilateral activity produces smaller grinding movements
  35. Sternocleidomastoid: Proximal
    Lateral Surface of mastoid process of temporal bone and lateral half of superior nuchal line
  36. Sternocleidomastoid: Distal
    Sternal Head: Anterior surface of manubrium of sternum; Clavicular Head: Superior surface of medial thrid of clavicle
  37. Sternocleidomastoid: Innervations
    Spinal Accessory Nerve (CN XI, motor); C2 and C3 nerves (pain and proprioception)
  38. Sternocleidomastoid: Action
    Unilateral Contraction: Tilts head to same side and rotates it so face is turned superiorly toward opposite side. Bilateral Contraction: 1) Extends neck at atlanto-occipital joints; 2) flexes cervical vertebrae so that chin approaches manubrim; 3) Extends superior cervical vertebrae so chin is thrust forward with head kept level; With cervical vertebrae fixed, may elevate manubrim and medial ends of clavicle, assisting in pump-hanle action of deep respiration (That's a whole lot of crap!)
  39. Posterior Scalene: Proximal
    Posterior tubercles of transverse processes of C5-C7;
  40. Posterior Scalene: Distal
    External Border of 2nd rib
  41. Posterior Scalene: Innervations
    Anterior Rami of cervical spinal nerves C7 and C8
  42. Posterior Scalene: Action
    Flexes neck laterally; elevates 2nd rib during forced inspiration
  43. Middle Scalene: Proximal
    Posterior tubercles of transverse processes of C5-C7;
  44. Middle Scalene: Distal
    Superior surface of 1st rib, posterior to groove for sublcavian artery
  45. Middle Scalene: Innervation
    Anterior Rami of cervical spinal nerves
  46. Middle Scalene: Action
    Flexes neck laterally; elevates 1st rib during forced inspiration
  47. Anterior Scalene: Proximal
    Transverse processes of C3-C6
  48. Anterior Scalene: Distal
    1st rib
  49. Anterior Scalene: Innervation
    Cervial spinal nerves C4-C6
  50. Anterior Scalene: Action
    Flexes head
  51. Omohyoid, Inferior Belly: Proximal
    Superior border of scapula near suprascapular notch
  52. Omohyoid, Inferior Belly: Distal
    Inferior border of hyoid
  53. Omohyoid, Inferior Belly: Innervation
    C1 - C3, by a branch of ansa cervicalis
  54. Omohyoid, Inferior Belly: Action
    Depresses, retracts and steadies hyoid
  55. Sternothyroid: Proximal
  56. Sternothyroid: Distal
  57. Sternothyroid:

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