1 / 26

Regional Muscle Review

Regional Muscle Review. Will Kleinelp Associate Professor Department of Biology. HEAD & NECK MUSCLES. Digastric. ORIGIN Anterior belly: digatric fossa on posterior surface of symphysis menti. posterior belly: base of medial aspect of mastoid process INSERTION

satchel
Download Presentation

Regional Muscle Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Regional Muscle Review Will Kleinelp Associate Professor Department of Biology

  2. HEAD & NECK MUSCLES

  3. Digastric • ORIGIN • Anterior belly: digatric fossa on posterior surface of symphysis menti. posterior belly: base of medial aspect of mastoid process • INSERTION • Fibrous loop to lesser cornu of hyoid bone • ACTION • Elevates hyoid bone. Aids swallowing and depresses mandible

  4. Mylohyoid • ORIGIN • Mylohyoid line on internal aspect of mandible • INSERTION • Anterior three quarters : midline raphe. posterior quarter: superior border of body of hyoid bone • ACTION • Elevates hyoid bone, supports and raises floor of mouth. Aids in mastication and swallowing

  5. Masseter • ORIGIN • Anterior two thirds of zygomatic arch and zygomatic process of maxilla • INSERTION • Lateral surface of angle and lower ramus of mandible • ACTION • Elevates mandible (enables forced closure of mouth)

  6. Sternocleidomastoid • ORIGIN • Anterior and superior manubrium and superior medial third of clavicle • INSERTION • Lateral aspect of mastoid process and anterior half of superior nuchal line • ACTION • Flexes and laterally rotates cervical spine. Protracts head when acting together . Extends neck when neck already partially extended

  7. Temporalis • ORIGIN • Temporal fossa between inferior temporal line and infratemporal crest • INSERTION • Medial and anterior aspect of coronoid process of mandible • ACTION • Elevates mandible and posterior fibers retract

  8. Occipitalis

  9. Orbicularis oris • ORIGIN • Near midline on anterior surface of maxilla and mandible and modiolus at angle of mouth • INSERTION • Mucous membrane of margin of lips and raphe with buccinator at modiolus • ACTION • Narrows orifice of mouth, purses lips and puckers lip edges

  10. Orbicularis oculi • ORIGIN • Medial orbital margin and lacrimal sac (orbital, palpebral and lacrimal parts) • INSERTION • Lateral palpebral raphe • ACTION • Closes eyelids, aids passage and drainage of tea

  11. Buccinator • ORIGIN • External alveolar margins of maxilla and mandible by molar teeth, to maxillary tubercle and pterygoid hamulus and posterior mylohyoid line respectively, then via pterygomandibular raphe between bones • INSERTION • Decussates at modiolus of mouth and interdigitates with opposite side • ACTION • Aids mastication, tenses cheeks in blowing and whistling, aids closure of mouth

  12. Scalenes (ant scalene) • ORIGIN • Anterior tubercles of transverse processes of C3-6 • INSERTION • Scalene tubercle on superior aspect of 1st rib • ACTION • Accessory to inspiration. lateral flexion of neck when 1st rib fixed

  13. Splenius • ORIGIN • Lower ligament nuchae, spinous processes and supraspinous ligaments T1-3 • INSERTION • Lateral occiput between superior and inferior nuchal lines • ACTION • Extends and rotates cervical spine

  14. Zygomaticus major • ORIGIN • Anterior surface of zygomatic bone • INSERTION • Modiolus at angle of mouth • ACTION • Elevates and draws angle of mouth laterally

  15. Zygomaticus minor • ORIGIN • Lateral infra-orbital margin • INSERTION • Skin and muscle of upper lip • ACTION • Elevates and everts upper lip

  16. ChestAbdomen & Spine

  17. Pectoralis Major • ORIGIN • Clavicular head-medial half clavicle. Sternocostal head-lateral manubrium and sternum, six upper costal cartilages and external oblique aponeurosis • INSERTION • Lateral lip of bicipital groove of humerus and anterior lip of deltoid tuberosity • ACTION • Clavicular head:flexes and adducts arm. Sternal head: adducts and medially rotates arm . Accessory for inspiration

  18. Pectoralis minor • ORIGIN • 3, 4, 5 ribs • INSERTION • Medial and upper surface of coracoid process of scapula • ACTION • Elevates ribs if scapula fixed, protracts scapula (assists serratus anterior)

  19. External Oblique • ORIGIN • Anterior angles of lower eight ribs • INSERTION • Outer anterior half of iliac crest, inguinal lig, public tubercle and crest, and aponeurosis of anterior rectus sheath • ACTION • Supports abdominal wall, assists forced expiration, aids raising intraabdominal pressure and, with muscles of opposite side, abducts and rotates trunk

  20. Internal oblique • ORIGIN • Orbital surface of maxilla behind orbital margin • INSERTION • Post/inferior quadrant of sclera behind equator of eyeball • ACTION • Elevates eye in adduction. Laterally rotates eye in abduction

  21. Transversus abdominis • ORIGIN • Costal margin, lumbar fascia, anterior two thirds of iliac crest and lateral half of inguinal ligament • INSERTION • Aponeurosis of posterior and anterior rectus sheath and conjoint tendon to pubic crest and pectineal line • ACTION • Supports abdominal wall, aids forced expiration and raising intra-abdominal pressure. Conjoint tendon supports posterior wall of inguinal canal

  22. Rectus abdominis • ORIGIN • Pubic crest and pubic symphysis • INSERTION • 5, 6, 7 costal cartilages, medial inferiorcostal margin and posterior aspect of xiphoid • ACTION • Flexes trunk, aids forced expiration and raise intra-abdominal pressure

  23. Diaphragm • ORIGIN • Vertebral:crura from bodies of L1, 2 (left), L1-3 (right). Costal: medial and lateral arcuate ligs, inner aspect of lower six ribs . Sternal: two slips from posterior aspect of xiphoid • INSERTION • Central tendon • ACTION • Inspiration and assists in raising intra-abdominal pressure

  24. External Intercostals • ORIGIN • Inferior border of ribs as far back as posterior angles • INSERTION • Superior border of ribs below, passing obliquely downwards and backwards • ACTION • Fix intercostal spaces during respiration. Aids forced inspiration by elevating ribs

  25. Internal intercostals • ORIGIN • Inferior border of ribs as far back as posterior angles • INSERTION • Superior border of ribs below , passing obliquely downwards and backwards • ACTION • Fix intercostal spaces during espiration. Aids forced inspiration by elevating ribs

  26. Erector Spinae (Sacrospinalis) • ORIGIN • Transverse processes • INSERTION • Transverse processes several levels above • ACTION • Extends spine

More Related