appendicular skeleton Flashcards
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Supportive girdles
Pectoral
Pelvic
Appendicular skeleton
Allows us to move and manipulate objects
Limbs
Supportive girdle
Pectoral girdles
Positions the shoulders and supports arm
Provides base for arm movement
Parts of the pectoral girdle
-2 clavicles ; attached to scapula and sternum
-2 scapulae
Articulates with humerus
Pectoral girdle is very loose; highly flexible but easily
Dislocated
Pectoral girdle connects with axial skeleton only at
Manubrium (sternoclavicular joint) of sternum
Clavicles
Are long S-shaped bones
Originates at the manubrium and articulates with the scapulae
Clavicles
Sternal end is
Rounded
Acromial end is
Flattened
Inferior surface bears lines and tubercles for muscle attachment
Clavicles
Scapula
Is broad,flat triangular bone; articulates with the arm and collarbone
Scapula
Body
- superior border
- medial border (vertebral border)
- lateral border (axial lath border)
Scapular head
Holds gleniod cavity
- acromion process -end of the scapular spine
- coracoid process- muscle attachment
- gleniod fossa- articular depression
Humerus
Is the long, upper armbone that articulates with the pectoral girdle
Head/neck(proximal epiphysis)
Greater tubercle (shoulder tip) is for muscle attachmen
Surgical neck
Corresponds to the metaphysics
Shaft
Deltoid tuberosity-attaches deltoid muscle
Distal epiphysis
-capitulum; articulates with radius
-trochlea; articulates with ulna
Coronoid/olecranon fossa accepts ulnar projections
-lateral and Medial epicondyles
Antebrachium
Forearm
Radius
Is the lateral bone of the forearm
Radius
Disk-shaped radial head allows
Rotation with the humerus
Radius
Radial tuberosity
Attaches biceps; allows flexing of forearm
Radius
Styloid process
Stabilizes wrist joints
Ulna
The medial bone of the forearm
Ulna
C-shaped
Trochlear notch forms the hinge-joint of the elbow
Olecranon superior end
Is point of elbow
Ulna
Radial notch
Depression allowing articulation of radial head
Ulna
Styloid process
Is bony postrusion of wrist
Interosseous membrane
The membrane is the ligament that attaches radius to ulna and transfers force to ulna from radius then to humerus
Carpals
Form the wrist
Allow flexion, extension, abduction and addiction
Carpals 2 rows of?
4bones each