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Lecture 11

FORS 3331 Lecture 11: Dr Ferraro - FORS 3331 - Spring 2017 - Lecture 11

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Baylor University
Forensic Science
FORS 3331
Joseph V.Ferraro

Baker | FORS 3331 | Spring 2017 | Lecture 11 | Page 1 LECTURE 11: HYOID AND CLAVICLE The Hyoid The Basics – Located behind your resting mandible – Believed to be a misplaced head bone o Used to have a Darth Vader head o Somehow we grew a neck in between the top and bottom of our head and this is the bone left behind – Located in the neck, above the thyroid cartilage (i.e. Adam's apple are) – It's the only bone that does not articulate with any other – Kinda horseshoe shaped – Major point of attachment of muscles and cartilaginous structures of the neck – Forms via endochondral ossification from gill arches 2 and 3 The Anatomy – Body - curved midline bone fused to the greater horns laterally – Greater Horns - long, thin processes forming the posterior sides of the hyoid o Extends posteriorly – Lesser Horns - small eminences on the superior side of the bone o Project from the area where the body and greater horns meet o Humans have short lesser horns which has to do with our upright anatomy Most other animals have horns of equal length Baker | FORS 3331 | Spring 2017 | Lecture 11 | Page 2 The Clavicles The Basics – Your two collarbones – Tubular, s-shaped bone – The medial end articulates with the clavicular notch of the manubrium in a synovial joint – The lateral end articulates with the acromion process of the scapula – Ossifies in membrane (intramembranous) and secondary cartilage o 2 primary centers in the shaft o 1 secondary center at sternal end – First bone to ossify in fetal development (5th week) – Last bone to completely fuse on the sternal end (20-25 years of age) – Why do we have clavicles? o Cheetahs don't have clavicles • Need the long reach to run faster o They keep our shoulders at a fixed distance from our sternum o Our head and chest bones are pretty sturdy and solid o The arms are only attached to the torso by the clavicle and a lot of meat • This is why arms are relatively easy to rip off – The clavicle is a strut for the shoulder o It holds the scapula at a fixed distance from the sternum o It's strong ligaments are unlikely to tear o When force is applied the clavicle will usually fracture first The Anatomy – Costal Impression (Tuberosity) - located at the m
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