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Forensic Anthropology

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Presentation on theme: "Forensic Anthropology"— 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 USE INNOMINATE WHEN COMPLETE USE INDIVIDUAL BONE NAMES WHEN SEPARATE OR TO REFERENCE A SPECIFIC BONE OR FEATURE

3 THE INNOMINATE ILIUM – most superior of the 3 the blade
ISCHIUM - most inferior of the the ‘sit bone’ PUBIS – most anterior of the 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 Ischiopubic ramus: flat Obturator foramen: big hole The ischium and pubis – laterally Ischial spine: most inferior/posterior Lesser sciatic notch: inferior Ischial tuberosity: very thick Pubic tubercle: anterior, above symph

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; years Ischial tuberosity; years Iliac crest; 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

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


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
Male vs female Males sacrum curved Females sacrum straight (WHY?) Age Transverse line between S1 – S2 closes mid twenties

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

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