1 / 19

Forensic Anthropology

Forensic Anthropology. The Pelvic Girdle. THE PELVIS. The many names for this region Pelvis: composed of 2 innominate bones and the sacrum Innominate (or Os Coxae): each half of the “pelvic bowl” formed by the fusion of Ilium Ischium Pubis. THE INNOMINATE.

chi
Download Presentation

Forensic Anthropology

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. Forensic Anthropology The Pelvic Girdle

  2. THE PELVIS • The many names for this region • Pelvis: composed of 2 innominate bones and the sacrum • Innominate (or Os Coxae): each half of the “pelvic bowl” formed by the fusion of • Ilium • Ischium • Pubis

  3. THE INNOMINATE • ILIUM – most superior of the 3 the blade • ISCHIUM - most inferior of the 3 the ‘sit bone’ • PUBIS – most anterior of the 3 forms the symphysis

  4. THE INNOMINATE • FUNCTIONS: • Support internal organs • Changes in the human pelvis allow for bipedal locomotion

  5. THE INNOMINATE Each innominate articulates with *sacrum (at the auricular surface) *one femur (at the acetabulum) *the other innominate (at pubic symph)

  6. THE INNOMINATE – what to know • The ilium: medially - • Iliac crest – superior rim • Iliac fossa – superior depression under rim • ASIS and AIIS • Arcuate line – midline inferior ridge • Iliac tuberosity – posterior rugosity • Auricular surface - posterior (art.w/ sacrum) • Preauricular sulcus

  7. THE INNOMINATE – what to know • The ilium: laterally – • Iliac crest • Iliac pillar – ridge on midline of blade • PSIS and PIIS • Greater sciatic notch • Acetabulum (actually the point where all three bones fuse together, art. w/femur)

  8. THE INNOMINATE – what to know • The ischium and pubis – medially • Pubic ramus: anterior/superior, twists • Pubic symphysis: most anterior point • Ischiopubicramus: flat • Obturator foramen: big hole • The ischium and pubis – laterally • Ischial spine: most inferior/posterior • Lesser sciatic notch: inferior • Ischialtuberosity: very thick • Pubic tubercle: anterior, above symph

  9. THE INNOMINATE – L from R • Orient ilium (crest and blade) superior • Orient the pubic symphysis anteriorly and medially, ischium posterior and inferior • The acetabulum is on the side of origin (lateral)

  10. THE INNOMINATE – fusion ages • Ischiopubic ramus; 5-8 years • Acetabululm; 11-17 years • Ischial tuberosity; 16-20 years • Iliac crest; 17-23 years

  11. THE INNOMINATE uses in forensics • The pelvis is best for sex – due to changes in the pelvis for childbirth, there are numerous, easy to distinguish features that help differentiate males from females in both the PUBIS and the ILIUM • ALSO, well developed methods for aging adults based on changes in the PUBIC SYMPHYSIS

  12. THE INNOMINATE uses in forensics TO RECAP: • SEX: PUBIS AND ILIUM • AGE: FUSIONS, AURICULAR SURFACES, PUBIC SYMPHYSIS

  13. The sacrum • Large, wedge-shaped • Composed of 5 sacral vertebrae – fused • Articulates with L5, both innominates • Characteristics • Large bodies • Reduced spinous processes

  14. http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19464.jpghttp://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19464.jpg

  15. http://www.back.com/images/sacrum-4-19.jpg http://www.botany.uwc.ac.za/sci_Ed/grade10/manphys/images/man/sacrum.gif

  16. The sacrum – need to know • Posteriorly – • Posterior sacral foramina • Anteriorly • Anterior sacral foramina • Transverse line of fusion • Superiorly • Sacral promontory (sup/ant): central, superior border of S1 • Superior articular facets: articulation of L5-S1 • Spinal canal • Ala (wings) • Laterally • Auricular surface • Spinous processes

  17. The sacrum – uses in forensics • Age • Transverse line between S1 – S2 closes mid twenties • Male vs female • Males sacrum curved • Females sacrum straight (WHY?)

  18. The coccyx • Coccyx – group of fused bones vs coccygeal vertebra (individual bone) • Usually 4 segments fused – variation 3-5 • CV1 had transverse processes and horns (cornua) • CV2+ are variable, small, frequently lost • Typically all fuse together and frequently to sacrum

  19. http://content.answers.com/main/content/wp/en/thumb/6/62/200px-Gray100.pnghttp://content.answers.com/main/content/wp/en/thumb/6/62/200px-Gray100.png

More Related