IB131_9.11.09 - An Introduction to the Appendicular Skeleton The Appendicular Skeleton 126 bones Allows us to move and manipulate objects Limb

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An Introduction to the Appendicular Skeleton S e eto ± The Appendicular Skeleton ± 126 bones ± Allows us to move and manipulate objects ± Limb bones & girdles are “appended” or attached via appendicular skeleton ± cludes all bones besides axial skeleton Includes all bones besides axial skeleton ± The limbs ± The supportive girdles
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Appendicular Skeleton
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Appendicular Skeleton
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The Pectoral Girdle ± Also called the shoulder girdle ± Connects the arms to the body ± Positions the shoulders ± Provides a base for arm movement ± Provides attachment for many muscles that ove the arm move the arm ± Consists of: ± lavicles ollar bones)- nteriorly 2 clavicles (collar bones) anteriorly ± 2 scapulae (shoulder blades)- posteriorly ± Connects w/ axial skeleton only at the manubrium
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The Clavicles ± Long, slender, S-shaped bones ± Originate at the manubrium (sternal end) ± rticulate with the capulae cromial end) Articulate with the scapulae (acromial end)
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The Scapulae ± Broad, flat triangles ± Articulate with arm & collarbone ± Anterior surface: the subscapular fossa ± Body has three sides : superior border edial border ertebral border) medial border (vertebral border) lateral border (axillary border) ± Body has three corners: – superior angle – inferior angle teral angle – lateral angle
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The Scapulae ± The scapular head ± Holds glenoid cavity, which articulates with humerus to form shoulder joint rocesses of the glenoid cavity ± Processes of the glenoid cavity ± Coracoid process : (corac- means “like a crow’s beak”) – anterior, smaller – Point of attachment for biceps & strong ligaments ± Acromion : – posterior, larger – articulates with clavicle – at the acromioclavicular joint
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The Scapulae ± Posterior features ± Scapular spine : ridge across posterior dge ac oss pos e o surface of body ± Separates two regions: supraspinous fossa infraspinous fossa
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The Upper Limbs ± The upper limbs consist of the arms, forearms, wrists, & hands ± 30 bones ote rm rachium = 1 bone, the umerus Note : arm ( brachium ) 1 bone, the humerus
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The Humerus ± Also called the arm ± he long, upper arm bone The long, upper arm bone ± Articulates with the pectoral girdle ± Tubercles of the proximal epiphysis ± Sites of attachment for rotator cuff muscles ± Separated by the intertubercular groove : greater tubercle : » lateral » rms tip of shoulder forms tip of shoulder lesser tubercle : » anterior, medial
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The Humerus ± Head : ± Rounded, articulating surface ± Contained within joint capsule ± Anatomical neck : ± Margin of joint capsule ± Surgical neck : ± The narrow metaphysis
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The Humerus ± The Shaft ± Deltoid tuberosity : bulge in the shaft – a bulge in the shaft – attaches deltoid muscle adial groove ± Radial groove : – for radial nerve osterior to deltoid tuberosity – posterior to deltoid tuberosity
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The Humerus ± The distal epiphysis ± Medial & lateral epicondyles : – for muscle attachment ± Condyle
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This note was uploaded on 09/29/2009 for the course INTEG BIO 131 taught by Professor Lewis during the Fall '09 term at University of California, Berkeley.

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IB131_9.11.09 - An Introduction to the Appendicular Skeleton The Appendicular Skeleton 126 bones Allows us to move and manipulate objects Limb

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